Abstract

Provided in the present invention is a high-temperature vibration modal test device for a variable-cross-section carbon fiber resin matrix composite. The high-temperature vibration modal test device comprises a triangular serrated slide rail, a high-temperature steel sliding bayonet, a sliding furnace door, a water cooling conduit, a dual-axis slide rail, a thermal insulation chamber, an infrared radiation heating array, a sheet-type armored thermocouple, an observation port, a tapped threaded rod, a tapped threaded fixture, a ceramic force transmission rod, a vibration exciter, a laser vibrometer, a vibration measurement port, a mechanical pump and an exhaust valve. A variable-cross-section test piece for a carbon fiber resin matrix composite is fixed to the high-temperature steel sliding bayonet, and is fixed to the tapped threaded fixture by means of the dual-axis slide rail. When a high-temperature vibration modal test is performed, the infrared radiation heating array provides a high-temperature thermal environment, the vibration exciter is connected to the tapped threaded fixture to provide random vibration, and thermal modal measurement is performed by means of the laser vibrometer. The present invention provides a test means for the high-temperature vibration modal test of the variable-cross-section carbon fiber resin matrix composite in an aerospace flight environment.

IPC Classes  ?

• G01M 7/02 - Vibration-testing
• G01D 21/02 - Measuring two or more variables by means not covered by a single other subclass

Abstract

The embodiments of the present disclosure provide a method for designing a high freedom parameterized frequency-modulated coded waveform, comprising: S1: obtaining a frequency-modulated coded vector; S2: selecting a coding model order to be utilized; S3: obtaining an parameterized instantaneous frequency function of a signal based on the frequency-modulated coded vector and the coding model order, integrating the parameterized instantaneous frequency function to obtain a phase of the signal, and generating the high freedom parameterized frequency-modulated coded waveform. Embodiments of the present disclosure provide a high freedom parameterized frequency-modulated coded waveform. The waveform has a continuous phase function, precise spectral control, and is configured to have a parameterized frequency-modulated waveform with high freedom.

IPC Classes  ?

• G06F 1/02 - Digital function generators
• G01S 7/35 - Details of non-pulse systems
• H04L 27/26 - Systems using multi-frequency codes

Abstract

Disclosed are a laser manufacturing microstructure partition regulation and control device and a corresponding method based on matrix modular temperature control. An inner portion of the device's console provides a plurality of temperature regulation and control elements arranged in a matrix form so that a workpiece is divided into different areas. During the laser manufacturing process, the temperature of the workpiece is monitored in real-time via a temperature detector; a wireless communication device is used for feeding back the collected data to a computer; the computer judges whether the workpiece needs to be heated or cooled, then the signal is transmitted to the wireless communication device, and the console controls an induction coil or a cooling nozzle to perform partition regulation and control on the temperature of the workpiece according to the signal so that the workpiece has a specific temperature gradient from a cladding layer to a substrate direction.

IPC Classes  ?

• B23K 26/03 - Observing, e.g. monitoring, the workpiece
• B23K 26/70 - Auxiliary operations or equipment

Abstract

A parking control method for an electric vehicle, a parking control system, and a storage medium. The parking control method comprises: collecting an actual rotational speed of a traction motor; collecting a parking instruction; in the case that a parking instruction is present and a rotational speed value of the actual rotational speed is less than or equal to a first set rotational speed value, carrying out disturbance observation on the operating conditions of an electric vehicle to obtain a relevant disturbance observation value; and on the basis of the disturbance observation value, setting a direction value of a target rotational speed of the traction motor, and setting a rotational speed value of the target rotational speed as a second set rotational speed value. In the case that a parking instruction is present and the rotational speed value of the target rotational speed is set to be the second set rotational speed value, a control amount is generated on the basis of the actual rotational speed and the target rotational speed, and the control amount is adjusted on the basis of the direction value of the target rotational speed to generate a control output amount used for controlling the traction motor. According to the present disclosure, stable parking can be achieved without depending on mechanical components of an electric vehicle.

IPC Classes  ?

• B60L 15/20 - Methods, circuits or devices for controlling the propulsion of electrically-propelled vehicles, e.g. their traction-motor speed, to achieve a desired performanceAdaptation of control equipment on electrically-propelled vehicles for remote actuation from a stationary place, from alternative parts of the vehicle or from alternative vehicles of the same vehicle train for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed

Abstract

Disclosed in the present invention are a high-power motor driving and charging integrated system and a control method. The high-power motor driving and charging integrated system comprises a storage battery, a voltage stabilizing capacitor, a charging resistor, a switching assembly, a first filter inductor, a second filter inductor, a third filter inductor, a first asymmetric half-bridge circuit, a second asymmetric half-bridge circuit, a third asymmetric half-bridge circuit, a first motor winding, a second motor winding and a third motor winding. When the system is in a charging mode, the charging mode comprises a three-phase charging mode, a single-phase charging mode and a direct-current charging mode. The switching assembly selects a corresponding filter circuit from the first filter inductor, the second filter inductor and the third filter inductor on the basis of different charging modes to connect to a circuit. The present invention provides a high-power motor driving and charging integrated system and a control method, and a low-cost and high-power switched reluctance motor driving and charging integrated system.

IPC Classes  ?

• H02P 25/08 - Reluctance motors
• B60R 16/02 - Electric or fluid circuits specially adapted for vehicles and not otherwise provided forArrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric

Abstract

Disclosed is a vehicle-road collaborative lane-changing risk assessment method based on a coordinate transformation, including: parsing vehicle marshaling information of a vehicle-road collaborative platform to obtain driving data of involved vehicles; determining a two-dimensional coordinate system that takes a lane-changing vehicle as a center point; converting a geographic coordinate system into a spatial coordinate system, and mapping the same into the two-dimensional coordinate system to complete the transformation from the geographic coordinate system to a real-time plane coordinate system; establishing a risk assessment model; inputting driving data and expected values of the involved vehicles during the lane changing into the risk assessment model for computational analysis and simulation; and exploring an influence of the driving data on a lane-changing risk to identify a factor that has a greatest influence on the lane-changing risk.

IPC Classes  ?

• G08G 1/16 - Anti-collision systems

Abstract

Disclosed are a linear motion platform driven by an external thread piezoelectric actuator and a method thereof. The linear motion platform comprises an actuator, a first fixed support, a second fixed support, a rolling bearing, a connecting plate, an objective table, and M guide assemblies. The actuator comprises a metal matrix, a driving nut, a first piezoelectric assembly, a second piezoelectric, a front beam, a rear beam, and first and second fixed bolts. The platform can drive the objective table to perform a linear motion directly through the actuator, is simple and compact in structure, high in precision, capable of being self-locked in case of power failure and good in universality, and has relatively high application values in the field of precision transmission.

IPC Classes  ?

• H02N 2/04 - Constructional details
• H02N 2/06 - Drive circuitsControl arrangements
• H10N 30/853 - Ceramic compositions
• H10N 30/88 - MountsSupportsEnclosuresCasings

Abstract

Disclosed are an impact-corrosion coupled damage structure fatigue limit prediction method and device based on a critical distance method. The method of the present invention comprises: calculating a three-dimensional fractal dimension on the basis of a planar image of a damage structure to be predicted that has undergone impact-corrosion coupling; calculating a theoretical stress concentration factor on the basis of the damage situation of said damage structure; establishing a stress gradient correction function for the root of a damage notch on the basis of the three-dimensional fractal dimension and the theoretical stress concentration factor; looking up a pre-generated material-critical distance table to obtain a critical distance corresponding to the material of the current damage structure to be predicted; and establishing a three-dimensional model of the damage structure to be predicted, and when the error between the corrected stress corresponding to a critical point and the fatigue limit of a smooth specimen is a preset threshold value, using an external load on the three-dimensional model as the fatigue limit of a damage component to be predicted. According to the present invention, the prediction process is relatively simple, only linear elasticity analysis is needed, and the prediction precision is high.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Abstract

Disclosed in the present invention are a plasmon nano-alloy photo-thermal coupling methane dry reforming catalyst, and a preparation method therefor and the use thereof. The catalyst comprises a ternary nano-metal component and a magnesium aluminum spinel carrier, and can be used for converting a greenhouse gas into a fuel directly driven by solar energy. The catalyst can absorb ultraviolet-visible light irradiated by an external xenon lamp in a photo-thermal reactor, and the temperature required by thermocatalysis is reached by utilizing thermal radiation, thereby reaching a higher photo-thermal fuel conversion efficiency. The excellent performance of the catalyst is due to an extremely high solar spectrum absorptivity thereof, and the catalyst can pre-activate reactive gas molecules by exciting a plasmon effect with a visible light wave band, thereby reducing the apparent activation energy under direct light, and can also inhibit carbon deposits generated by the complete cracking of methane, thereby improving the stability of a methane dry reforming reaction, such that the reaction is efficiently operated.

IPC Classes  ?

• B01J 23/80 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with zinc, cadmium or mercury

Abstract

A method for manufacturing a multi-axial three-dimensional woven structure composite material blade preform and an apparatus. The method comprises the following specific steps: (1) arranging 0° warp yarns; (2) introducing 90° weft yarns; (3) introducing +-θ° bias yarns; (4) compacting fabric; (5) repeating steps (1)-(4) until a target thickness of the fabric is obtained; and (6) introducing Z-direction yarns. Compared with a conventional three-dimensional woven structure which is only arranged in three directions, i.e., X, Y, and Z axes, due to the introduction of the bias yarns, the design performance of a composite material blade is improved, the elastic performance of the composite material is improved by means of the introduction of the bias yarns, and the anti-fatigue bearing capacity under the vibration load is improved.

IPC Classes  ?

• D04C 3/00 - Braiding or lacing machines
• D03D 25/00 - Woven fabrics not otherwise provided for

Abstract

The invention relates to a 3D/2D hybrid perovskite solar cell and its preparation method, which belongs to the field of preparation technology of perovskite material. By using aromatic organic spacer that can enhance the conjugation effect, a 3D/2D multi-dimensional perovskite is obtained, and its conjugation effect is enhanced, thereby improving its charge transport capability, which makes that the 3D/2D perovskite solar cell has both the high light absorption rate and charge transport capability of 3D perovskite material and the excellent stability of 2D perovskite material, so as to achieve efficient and stable 3D/2D multi-dimensional perovskite material and device.

IPC Classes  ?

• H10K 30/40 - Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers
• H10K 85/50 - Organic perovskitesHybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3
• H10K 101/00 - Properties of the organic materials covered by group

Abstract

Disclosed is a collaborative design system and method for a thermophysical property gradient distribution and a braided structure of a CMC and a storage medium. The system comprises at least one storage medium and at least one processor. The at least one processor is configured to: generate a temperature field parameter of a surface of a CMC turbine blade under a non-uniform inflow condition based on a simulation analysis platform, and extract a convective heat transfer coefficient; partition the CMC turbine blade and import an extracted fluid-solid heat transfer boundary condition into an optimization platform; perform multi-objective optimization on the thermophysical property gradient distribution of the CMC turbine blade under the non-uniform inflow condition based on an optimization simulation tool; and generate C nanotube contents of different regions of the CMC turbine blade based on a correspondence function and values of material thermal conductivities of the different regions of the CMC turbine blade to realize the collaborative design of the thermophysical property gradient distribution and the braided structure of the CMC.

IPC Classes  ?

• G06F 30/15 - Vehicle, aircraft or watercraft design

Abstract

The embodiments of the present disclosure provide a method for an image simulation generation based on a near-field simulation of a computational electromagnetic field, the method comprising: constructing a simulated three-dimensional model based on model parameters; constructing a simulated Kohler illumination model based on a light source parameter; using a degree of similarity change in a synthesized image under incremental aperture diaphragm sampling points as a criterion for approximate convergence of the simulation to determine a count of samples to be used for a balancing combination of simulation cost and accuracy; an optical simulation is performed based on the simulated three-dimensional model and the simulated Kohler illumination model, and a far-field electromagnetic field distribution data is obtained to obtain a simulated image by synthesizing the image. In the generation of a large count of simulated images on the basis of pseudo-random defect dataset generation may be further realized, in the acquisition of a large count of datasets, the dataset of defect inspection model may be trained, in order to achieve a direct detection for patterned wafer defective images and solve the problem of difficult access to reference images in a process of patterned wafer defect detection.

IPC Classes  ?

• G06T 7/00 - Image analysis
• G06T 7/13 - Edge detection
• G06T 7/155 - SegmentationEdge detection involving morphological operators
• G06T 15/50 - Lighting effects
• G06T 17/00 - 3D modelling for computer graphics

Abstract

The present invention relates to the field of three-dimensional model simulation. Particularly disclosed is a template-based pelvic model corridor positioning method, comprising: on the basis of a pelvic model library, establishing a pelvic average statistical shape model; on the basis of the pelvic average statistical shape model, acquiring a corridor template, the corridor template comprising position information of a corridor in the pelvic average statistical shape model and the pelvic average statistical shape model; preprocessing a CT image, and using the preprocessed CT image to generate a target model of a pelvis; and on the basis of the corridor template, positioning a corridor in the target model. The present invention can realize automatic establishment of corridors, thus saving time for doctors, and simplifying operations of doctors.

IPC Classes  ?

• G06T 7/73 - Determining position or orientation of objects or cameras using feature-based methods
• G06T 7/33 - Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods
• G06N 3/0464 - Convolutional networks [CNN, ConvNet]
• G06N 3/0455 - Auto-encoder networksEncoder-decoder networks
• A61B 34/10 - Computer-aided planning, simulation or modelling of surgical operations

Abstract

The present invention relates to the field of ultrasonic motor starting, and provides an ultrasonic motor starting device and method based on ultrahigh performance index output. The device comprises a double-input AND gate, comprising a first input end, a second input end, and an output end, wherein the first input end is used for inputting a Ti timing signal; the second input end is connected to a pulse output end of a frequency division counter; the output end of the double-input AND gate is connected to an input end of a D flip-flop; a clock end of the D flip-flop is connected to a clock end of the frequency division counter and receives a clock; the clock is a system clock; an output end of the D flip-flop is connected to a clock end of a latch; an input end of the latch is used for receiving an FiDATA frequency division value; the FiDATA frequency division value is an input signal of a Ti time period; a multi-path data output end of the latch is connected to a data input end of the frequency division counter; and an output end of the frequency division counter outputs a SIN driving signal or a COS driving signal. The present invention can improve the safety and reliability of ultrasonic motor starting.

IPC Classes  ?

• H02N 2/00 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction

Abstract

An ultrasonic motor isolated pole normalization setting circuit. In the ultrasonic motor isolated pole normalization setting circuit, a load resistor is connected in series to an alternating-current ammeter; a potentiometer is connected in series to a single-pole double-throw switch; two series branches are connected in parallel; a second plug is located on a driver side of an ultrasonic motor; a driving socket is located on an ultrasonic motor side; a sin signal end, a cos signal end, a voltage feedback end, and a grounding end of the first plug are correspondingly connected to corresponding ports of the driving socket; the sin signal end, the cos signal end, and the grounding end of the first plug are correspondingly connected to corresponding ports of a second plug; the voltage feedback end of the first plug is connected to a connection point between the alternating-current ammeter and the single-pole double-throw switch; the grounding end of the first plug is connected to a connection point between the load resistor and the potentiometer; and a normalized setting resistor is connected between a voltage feedback end and a grounding end of the driving socket. An excitation voltage and an isolated pole signal voltage are kept in a correct proportional relation all the time.

IPC Classes  ?

• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
• H02N 2/00 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
• G01D 18/00 - Testing or calibrating apparatus or arrangements provided for in groups

Abstract

Disclosed is a method for enhancement of a low-light image based on reinforcement learning and aesthetic evaluation. The method include: generating images of non-normal luminance under different lighting scenes, and constructing a training dataset for a reinforcement learning system based on the images; initializing the training dataset, a policy network, and a value network; updating, based on a no-reference reward score and an aesthetic assessment reward score, the policy network and the value network; completing model training and outputting an enhanced image result. By expanding the action space range defined in reinforcement learning, the enhancement operations for the input low-light image gain a greater dynamic range, offering higher flexibility for real-world scenarios and better meeting low-light image enhancement needs. Additionally, by incorporating the aesthetic quality assessment scores as part of the loss function, the enhanced image achieves better visual effects and higher subjective user evaluation scores.

IPC Classes  ?

• G06T 5/60 - Image enhancement or restoration using machine learning, e.g. neural networks
• G06T 5/92 - Dynamic range modification of images or parts thereof based on global image properties
• G06T 5/94 - Dynamic range modification of images or parts thereof based on local image properties, e.g. for local contrast enhancement

Abstract

The present invention relates to the technical field of traveling wave type ultrasonic motors. Disclosed are a frequency difference adjusting circuit and method based on ultra-high performance output of an ultrasonic motor. The circuit comprises a pre-frequency division counter, an OR gate, and a main frequency division counter, wherein a system clock frequency is input to a CK end of the pre-frequency division counter, a given Hz frequency division ratio is input to a D end of the pre-frequency division counter, and an output end of the pre-frequency division counter is connected to a second input end of the OR gate; the system clock frequency is input to a first input end of the OR gate, and an output end of the OR gate is connected to a CK end of the main frequency division counter; a given main frequency division ratio is input to a D end of the main frequency division counter, and an output end of the main frequency division counter outputs a driving signal frequency. According to the present invention, by changing a CK clock frequency of an original digital frequency division counter, the frequency interval adjustment of a PWM driving signal is realized, thereby enabling an ultrasonic motor to be effectively and reliably applied in the field of ultra-high stability engineering.

IPC Classes  ?

• H02N 2/00 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction

Abstract

A device for heat control in laser welding of dissimilar additively-manufactured parts includes a welding main body, a moving frame, a lifting frame, a laser welding head, a temperature control mechanism, a pressing mechanism, and a supporting and cleaning mechanism. The moving frame is mounted on the welding main body. The lifting frame is provided on the moving frame. The temperature control mechanism includes a welding platform designed to hold a laser metal deposition (LMD) printed part and a selective laser melting (SLM) printed part. The laser welding head is provided on the underside of the lifting frame for to weld the LMD part to the SLM part.

IPC Classes  ?

• B23K 26/21 - Bonding by welding
• B22F 7/06 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite workpieces or articles from parts, e.g. to form tipped tools
• B23K 26/14 - Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beamNozzles therefor
• B33Y 40/20 - Post-treatment, e.g. curing, coating or polishing

Abstract

This application provides a switched capacitor circuit SC and an electronic device. In the SC, when the SC circuit works in different voltage step-down modes, voltage step-down is separately performed in a ratio of 4:1, 2:1, and 1:1 on a voltage at an input end and then a voltage is output at the two ends of the fourth capacitor Co to implement switching of a plurality of voltage step-down ratios.

IPC Classes  ?

• H02M 3/07 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode

Abstract

Disclosed in the present invention is an impregnation pretreatment apparatus for a continuous carbon fiber composite filament material, comprising a conveying assembly, wherein the conveying assembly is arranged on a pretreatment apparatus frame, sizing-layer spray assemblies being disposed on both the left side and right side of the conveying assembly, and several multi-angle cleaning assemblies being disposed in sequence at the foremost end of the pretreatment apparatus frame. The present invention overcomes the defects in the impregnation of a continuous fiber reinforced composite material by performing pretreatment on the surface thereof; that is, during a fiber spreading process, a thermoplastic sizing layer is sprayed onto a fiber surface before subsequent impregnation treatment, thereby avoiding internal defects of the filament material.

IPC Classes  ?

• B29B 15/14 - Coating or impregnating of reinforcements of indefinite length of filaments or wires

Abstract

Provided in the present invention is a secondary impregnation filament-making method for a composite filament suitable for additive manufacturing. The method comprises: first performing a fiber spreading operation on fibers by means of a fiber spreading assembly, spraying a thermoplastic sizing layer onto the surfaces of the fibers by means of a thermoplastic sizing layer spraying and attaching assembly during the fiber spreading process, and then performing an impregnation treatment, wherein the fiber spreading assembly and the thermoplastic sizing layer spraying and attaching assembly are both installed on a machine frame. The present invention has the beneficial effects that the thermoplastic sizing layer is sprayed onto the surfaces of fibers during the fiber spreading process, and then a conventional impregnation treatment is performed, thereby making the impregnation degree of a continuous-fiber-reinforced composite filament high and reducing internal defects of a formed part; and by means of combining the thermoplastic sizing layer spraying and attaching assembly with the fiber spreading assembly, the degree of uniformity of the thermoplastic sizing layer on the surfaces of the fibers is effectively guaranteed, and the effect of the subsequent conventional impregnation treatment is guaranteed.

IPC Classes  ?

• B29C 70/30 - Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or coreShaping by spray-up, i.e. spraying of fibres on a mould, former or core
• B29C 70/34 - Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or coreShaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression

Abstract

An electromagnetic stepping three-dimensional rotary braiding machine and a method for preparing a three-dimensional structured fabric by the braiding mechanism. The braiding machine comprises a braiding machine chassis (2) and a motion mechanism thereof, an electromagnetic auxiliary system, a fabric traction device (1), and an electronic control system (3). The motion mechanism of the braiding machine chassis is composed of cross-shaped forks (10) disposed adjacent to each other, and is used for driving yarn carriers (5) to move in a specific pattern. The electromagnetic auxiliary system is used for achieving position transfer and stopping of the yarn carriers (5) between motion components. The fabric traction device (1) is used for lifting a woven fabric at a certain speed. The electronic control system (3) is used for issuing and transmitting a motion instruction for the yarn carriers (5). The braiding machine uses the electromagnetic auxiliary system to control movement and stopping of the yarn carriers (5). Compared with conventional stepping rotary braiding machines, the mechanical structure and transmission mode are significantly simplified, and it is easy to achieve automated and digitalized formation of complex-structured three-dimensional woven fabrics.

IPC Classes  ?

• D04C 3/38 - Driving-gearStarting or stopping mechanisms
• D04C 3/40 - Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances
• D04C 3/46 - Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances with thread carriers supported on rolls

Abstract

The invention relates to a gas phase treatment method for modifying the surface of perovskite materials, which belongs to the field of preparation technology of perovskite material. The details are as follows: the perovskite material is exposed to a hydrogen halide vapor environment at atmospheric pressure. Hydrogen halide can effectively fill the defect sites on the perovskite surface and form stable strong chemical bonds with the perovskite surface. The modified perovskite solar cells based on the invention have enhanced resistance to high temperature, high humidity and strong light. The simulation test shows that the modified photoelectric device can work stably outdoors for nearly 10 years. The invention addresses the issue of poor stability commonly associated with halide perovskite materials, and it offers a low-cost process, which is expected to promote the industrialization and commercialization of perovskite solar cells.

IPC Classes  ?

• C01G 21/00 - Compounds of lead

Abstract

The invention relates to a perovskite solar cell modified by a chelating layer and its preparation method, within the field of perovskite material preparation. The process involves spin-coating N, N′-bis(4-pyridyl)-1,4,5,8-naphthalenetetracarboxylic diimide (DPNDI) solution on the perovskite surface, followed by annealing. This modification forms a chelating structure on the surface, passivating defect sites and grain boundaries, promoting charge transfer with optimized energy levels and carrier mobility. The Pb (II) coordination polymer layer enhances bonding strength and adhesion, effectively suppressing traps. The treated perovskite solar cell achieves a photoelectric conversion efficiency (PCE) of 24.2%, with a T80 lifetime retaining over 95% (40° C.) and 85% (85° C.) of the initial PCE after 2000 hours. This modified film inhibits ion migration, providing enhanced stability and high photoelectric conversion efficiency in optoelectronic devices.

IPC Classes  ?

• H10K 30/88 - PassivationContainersEncapsulations
• H10K 30/40 - Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers
• H10K 71/12 - Deposition of organic active material using liquid deposition, e.g. spin coating

Abstract

A high-temperature vibration modal testing device for variable cross-section carbon fiber resin-based composites includes triangular serrated sliding rails, high-temperature steel sliding bayonets, sliding furnace door, water-cooled conduits, dual-axis sliding rail, insulation box, infrared radiation heating array, thin armored thermocouples, observation port, tapping threaded rod, tapping threaded fixture, ceramic force transmission rod, excitation source, laser vibration measurer, vibration measuring port, mechanical pump, and exhaust valve. A variable cross-section carbon fiber resin-based composite test piece is fixed to the high-temperature steel sliding bayonets and fixed to the tapping threaded fixture by the dual-axis sliding rail. During high-temperature vibration modal testing, the infrared radiation heating array provides a high-temperature thermal environment, the excitation source connected to the tapping threaded fixture provides random vibration, and thermal model measurement is performed through the laser vibration measurer. The device can perform high-temperature vibration modal testing on variable cross-section carbon fiber resin-based composites in aerospace flight environments.

IPC Classes  ?

• G01N 29/04 - Analysing solids
• G01N 1/44 - Sample treatment involving radiation, e.g. heat
• G01N 29/24 - Probes

Abstract

A variable-diameter blade suitable for a trans-media aircraft. The blade is divided into a blade root section, telescopic sections, and a blade tip section in a direction from the root to the tip. The blade further includes a telescopic rod, the blade root section and the blade tip section are fixed to the telescopic rod, respectively, and the telescopic rod is fixed to the trans-media aircraft; a spring arranged in the telescopic rod, the spring is used to drive the telescopic rod to extend; a pulley installed on the trans-media aircraft, the pulley is closer to the blade root section; a pull rope, an end of the pull rope passes through an inside of the blade and is fixed to the blade tip section, and the other end of the pull rope is wound on the pulley; and a driving device for driving the pulley to rotate.

IPC Classes  ?

• B64C 3/54 - Varying in area
• B64C 35/00 - Flying-boatsSeaplanes

Abstract

A design method for a woven CMC fan-shaped-converging slot shaped film cooling structure. The design method comprises: for 2.5D woven CMC structures, which are orderly arranged one above another, by means of staggering, moving a warp yarn of each layer to the right by a distance d on the basis of a warp yarn of a previous layer, and bending, connecting and hooking back woven weft yarns to form reserved spaces in the CMC structures; filling the reserved spaces with ablatable cores to construct forward-tilting fan-shaped film holes; removing one warp yarn that is located downstream of the forward-tilting fan-shaped film holes and is close to an upper wall surface to obtain a construction space; and forming, according to the construction space, a slot in the vertical upper wall surface from which the warp yarn is removed, and connecting the fan-shaped cross sections of the forward-tilting fan-shaped film holes to the constructed slot by means of UG straight grains to form a fan-shaped-converging slot shaped film cooling hole.

IPC Classes  ?

• G06F 30/17 - Mechanical parametric or variational design
• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06F 113/26 - Composites
• G06F 113/08 - Fluids
• G06F 119/08 - Thermal analysis or thermal optimisation

Abstract

A revolving cathode tool and method for co-rotating electrochemical machining of an inner wall of an aero-engine casing are provided, and relates to the technical field of electrochemical machining. The co-rotating electrochemical machining revolving cathode tool comprises a power supply, a cathode shaft, an anode workpiece and a flexible cathode assembly. The cathode shaft is electrically connected with a cathode of the power supply. The anode workpiece is electrically connected with an anode of the power supply. One end of the cathode shaft is connected with the flexible cathode assembly. The problem that a non-array complex structure of the inner wall of the aero-engine casing cannot be machined through counter-rotating electrochemical machining is fundamentally solved. The diameter of the cathode tool is 1/n of the diameter of the anode workpiece.

IPC Classes  ?

• B23H 3/04 - Electrodes specially adapted therefor or their manufacture

Abstract

Disclosed in the present invention is a turbine transition state blade tip clearance estimation method based on a long short-term memory neural network. The method comprises: first, using data concatenation and introduction of new parameters to construct multi-transition-state process transient data; then using sensitivity analysis to screen for feature parameters having a great influence on a blade tip clearance, and carrying out dimension reduction on the influence parameters; and on the basis of a long short-term memory neural network, constructing a mapping model between each feature parameter and the blade tip clearance, and building an efficient and high-precision turbine transition state blade tip clearance estimation model. By means of the turbine transition state blade tip clearance estimation model, turbine blade tip clearances of multiple transition state processes can be efficiently and accurately estimated.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Abstract

A graphics processing unit (GPU)-based numerical simulation system and method for a helicopter flow field (FF). The GPU-based system includes a central processing unit (CPU) and a GPU. The CPU is configured to initialize a moving overset grid according to a preset configuration file and the mesh files of a to-be-simulated helicopter; determine face batch information according to mesh blocks in the moving overset grid; determine an overset interpolation relationship between the mesh blocks and an interpolation mapping index according to the mesh files at a current simulation moment; and perform FF information exchanging between the mesh blocks according to the overset interpolation relationship, the interpolation mapping index, and FF information of the mesh blocks, to obtain to-be-simulated helicopter FF information. The GPU computes the FF information of the mesh blocks in the motion nested mesh according to surface batch information by using a computational fluid dynamics (CFD) method.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06F 111/10 - Numerical modelling
• G06F 113/08 - Fluids
• G06T 1/20 - Processor architecturesProcessor configuration, e.g. pipelining

Abstract

Disclosed is a multi-modal and multi-degree-of-freedom piezoelectric active vibration isolation platform and a working method therefor. The piezoelectric active vibration isolation platform includes an upper platform, a lower platform, a control module, and four vibration isolation modules, where the vibration isolation module includes a passive vibration isolation unit and an active vibration isolation unit; the passive vibration isolation unit includes an upper connector, a lower connector, a cross Hooke hinge, and a first acceleration sensor; the active vibration isolation unit includes a fixed beam, a pre-tightening bolt, a second acceleration sensor, and a driving component; the platform can provide active vibration isolation for the longitudinal (axial) vibration and the bending vibration in any radial direction of a vibration isolation object, and has the advantages of fast response, resistance to electromagnetic interference, and light weight.

IPC Classes  ?

• F16F 15/00 - Suppression of vibrations in systemsMeans or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
• B06B 1/06 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
• F16M 11/22 - Undercarriages with or without wheels with approximately constant height, e.g. with constant length of column or of legs

Abstract

A high-strength welding wire includes, in weight percentage, 5.8% Cu, 0.2% Mn, 0.1% V, 0.2% Zr, 0.2% Si, 0.3% Fe, 0.1% Zn, 1.4% compensation element, 0.2% hydrogen evolution element, 1.2% nanoceramic particle, and Al for the balance. Various powdered raw materials are mixed, wrapped with an aluminum strip, rolled and subjected to wiredrawing to form the high-strength welding wire. In a welding method for the high-strength welding wire, a K-shaped groove is formed between a stringer and a panel, and an inclined angle of the welding gun and a distance between the welding gun and the weld are adjusted. Then the angle between the wire-feeding tube and the welding gun and the striking mechanism and the weld are adjusted. Protective gas is supplied to the welding pool, and a laser is activated to perform welding. A striking mechanism is started to strike the weld.

IPC Classes  ?

• B23K 35/00 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
• B23K 26/14 - Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beamNozzles therefor
• B23K 35/30 - Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
• B23K 35/34 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material comprising compounds which yield metals when heated

Abstract

Disclosed in the present invention is a vehicle-infrastructure cooperation lane-changing risk assessment method based on a coordinate transformation. The method comprises: parsing vehicle platooning information parameters of a vehicle-infrastructure cooperation platform, so as to obtain traveling data of relevant vehicles; determining a two-dimensional coordinate system which uses a lane-changing vehicle as center coordinates; transforming a geographic coordinate system into a space coordinate system, and mapping the space coordinate system into the two-dimensional coordinate system, thereby completing a transformation from the geographic coordinate system into a real-time planar coordinate system; establishing a risk assessment model; inputting the traveling data of the relevant vehicles and an expected value during a lane-changing process into the risk assessment model, and performing operation analysis and simulation; exploring the impact of the traveling data of the vehicles on a lane-changing risk; and obtaining a factor that has the greatest impact on the risk during the lane-changing process of the vehicle. In the present invention, a collision risk caused by a vehicle changing lanes during traveling is calculated by means of a coordinate transformation algorithm and a lane-changing risk assessment model, such that a risk index is quantified, thereby ensuring the safety and effectiveness of the vehicle during a lane-changing process, and providing a new way of thought for lane-changing logic determination and lane-changing path planning.

IPC Classes  ?

• G08G 1/16 - Anti-collision systems

Abstract

Disclosed is a method for structural damage monitoring for whole-machine life test of small turboshaft engine, comprising: determining a failure mode based on load borne by typical components of the small turboshaft engine in a service process and common failure forms, screening a structural damage index of a non-major component based on a coupling relationship between structural damages, selecting a destructive damage of components in the small turboshaft engine and an indirect damage causing changes in material properties of key component, planning a structural damage monitoring means based on the failure mode, the structural damage index, the destructive damage, and the indirect damage, designing an accelerated mission test platform of the small turboshaft engine, and designing a torque automatic loading scheme of an eddy current dynamometer, and testing the small turboshaft engine, and performing damage monitoring of the small turboshaft engine based on the planned structural damage monitoring means.

IPC Classes  ?

• G01M 15/14 - Testing gas-turbine engines or jet-propulsion engines
• F01D 21/00 - Shutting-down of machines or engines, e.g. in emergencyRegulating, controlling, or safety means not otherwise provided for

Abstract

The present invention provides a 3D printing head with laser preheating and in-situ compaction. The 3D printing head comprises a printing head mounting plate, wherein a pneumatic sliding block is mounted on a left upper portion of the printing head mounting plate; a wire feeding mechanism upper mount and a wire feeding mechanism lower mount are respectively mounted on the printing head mounting plate; a driving wire feeding wheel and a driven wire feeding wheel are mounted between the wire feeding mechanism upper mount and the wire feeding mechanism lower mount; a laser mounting bracket is mounted on a right side of the printing head mounting plate; a laser is mounted on the laser mounting bracket; the wire feeding mechanism lower mount is connected to a Teflon tube and an anvil block by means of a preimpregnated wire, wherein a nozzle is mounted on the anvil block; and a pneumatic wire shearing structure is mounted below the pneumatic sliding block. The present invention uses a high-energy laser beam to preheat the deposited preimpregnated wire in real time, so that the interlayer heating efficiency in a printing process is increased, the interface temperature during interlayer fusion is increased, and the interlayer bonding of a workpiece is enhanced.

IPC Classes  ?

• B29C 64/165 - Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
• B29C 64/295 - Heating elements

Abstract

The present invention provides a printing method based on high-temperature and low-temperature bi-material spatial distribution. By means of setting of a filling element body type, the continuous fiber pre-impregnated wire part in a product is stereoscopically coated by a resin or short-fiber reinforced resin wire part in spatial distribution, so that the performance uniformity regulation of the rigidity and the energy absorbency of a printed product is realized. Moreover, a high-temperature resin material and a low-temperature resin material are cooperatively printed to form a high-temperature resin frame of the product, and directional heat treatment is performed on the low-temperature resin material in the printed product, such that pores in the product can be bridged without affecting the final forming precision of the product, thereby optimizing the interface binding effect, improving the continuous fiber impregnation degree, and improving the mechanical property.

IPC Classes  ?

• B29C 64/118 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
• B33Y 10/00 - Processes of additive manufacturing

Abstract

A multi-robot collaborative planning method for machining a large capsule member of a Spacecraft is described. The method comprises: first, planning the number of instances of rotational displacement of a capsule, and the angle of each rotation; then, planning a multi-robot station layout and station switching strategy; and finally, when the position of the capsule and robot stations are fixed, planning a multi-robot machining task time sequence. The machining process for a large capsule is efficiently planned by selecting optimal rotation schemes and robot station positions, enhancing the rigidity of robot collaboration. This planning also streamlines the machining timeline, making the multi-robot task more compact and reducing idle time, thus boosting overall machining efficiency.

IPC Classes  ?

• G05B 19/42 - Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine
• B25J 9/00 - Programme-controlled manipulators
• B25J 9/16 - Programme controls
• B25J 11/00 - Manipulators not otherwise provided for
• G05B 19/40 - Open loop systems, e.g. using stepping motor
• G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]

Abstract

The present disclosure discloses an extremely high-temperature in-situ fretting fatigue experimental device for the mortise-tenon joint. The device includes: a loading member configured to support a tenon specimen and a mortise specimen, and apply a fatigue load; a heating member to heat the tenon specimen and the mortise specimen; a thermal insulation sleeve wrapping the heating member; a thermal insulation shield with an observation hole; and a control member configured to control opening or closing of the loading. Various measures including the using of heat-resistant materials for the gasket, thermal insulation shield and sleeve, reducing and shielding the thermal electrons, and decreasing the temperature in non-critical areas are adopted to improve the high-temperature imaging quality of the in-situ Scanning Electron Microscope (in-situ SEM) and enhance an upper limit of the in-situ SEM experimental temperature.

IPC Classes  ?

• G01N 3/06 - Special adaptations of indicating or recording means
• G01N 3/10 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure

Abstract

A multi-arm forming device for space on-orbit composite braiding is provided. Through the rotary movement of a combination of circularly arranged mechanical arm-type laying apparatuses relative to a mold, a plurality of hot press laying heads are controlled together to implement high-efficiency and high-freedom winding and braiding formation of a composite member. The retraction and expansion deformation of the gasbag mold is achieved by inflating and deflating based on design, and the overall device is lightened by switching its structural volume in an operating/non-operating state, thereby achieving the purpose of facilitating the lift-off of rockets and the demolding, repair and weight reduction of winding and braiding structural members for operation in space. Additionally, gas in a gasbag can be used as emergency kinetic energy for the movement and attitude adjustment of the overall device in space. High-quality and efficient winding and braiding formation of composites in space are achieved ultimately.

IPC Classes  ?

• B29C 53/80 - Component parts, details or accessoriesAuxiliary operations
• B29C 33/00 - Moulds or coresDetails thereof or accessories therefor
• B29C 53/56 - Winding and joining, e.g. winding spirally

Abstract

A determination method for a weather avoidance strategy of flights includes collecting historical radar trajectory data and historical weather data of various flights in a predetermined airport terminal area, and collecting weather forecast data in real time; determining an arrival and departure typical flight route of each flight in the predetermined airport terminal area on the basis of the historical radar trajectory data and the historical weather data; acquiring deviation information indicating deviation of each flight due to severe convective weather on the basis of the historical weather data, the arrival and departure typical flight route, and the historical radar trajectory data; determining flight deviation probabilities under different weather conditions on the basis of the historical weather data, the arrival and departure typical flight route and the deviation information, to generate a flight deviation probability chart; constructing a weather avoidance probability figure of the predetermined airport terminal area on the basis of the weather forecast data and the flight deviation probability chart; and formulating a weather avoidance strategy of each flight in the predetermined airport terminal area on the basis of the arrival and departure typical flight route and the weather avoidance probability figure.

IPC Classes  ?

• G08G 5/00 - Traffic control systems for aircraft
• G01S 13/95 - Radar or analogous systems, specially adapted for specific applications for meteorological use
• G06F 18/23213 - Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions with fixed number of clusters, e.g. K-means clustering

Abstract

An on-orbit composite filament forming device for space 3D printing includes a constant tension unwinding module, a replaceable resin filament rotary wrapping module, a melt preheating chamber, a curved channel impregnation chamber, a variable aperture resin recovery device, a heat protective housing, a convective cooling device, a traction device, and a winding device. The replaceable resin filament rotary wrapping module wraps a resin filament on a surface of a carbon fiber by circumferential rotation and is provided with an active unwinding reel placed on a circular rail centered on the carbon fiber; the melt preheating chamber is used for melting resin to wrap the surface of the fiber, and is equipped with a lifting device for automatic opening and closing; the curved channel impregnation chamber is formed with a wedge-shaped high-pressure impregnation zone by mutual extrusion of upper and lower pressure blocks, thereby improving the quality of fiber impregnation.

IPC Classes  ?

• B29C 48/05 - Filamentary, e.g. strands
• B29B 15/14 - Coating or impregnating of reinforcements of indefinite length of filaments or wires
• B29C 48/28 - Storing of extruded material, e.g. by winding up or stacking
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling
• B29C 48/885 - External treatment, e.g. by using air rings for cooling tubular films
• B29C 64/314 - Preparation
• B29C 70/52 - Pultrusion, i.e. forming and compressing by continuously pulling through a die
• B29K 105/08 - Condition, form or state of moulded material containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
• B29K 307/04 - Carbon
• B33Y 40/10 - Pre-treatment
• B33Y 70/10 - Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
• B29K 71/00 - Use of polyethers as moulding material

Abstract

A ventilation structure of a core chamber of a turbofan engine having a large bypass ratio, said structure comprising: an outer bypass wall surface (1), a core chamber wall surface (4) and a core casing (7). An outer bypass flow channel (2) is formed between the outer bypass wall surface (1) and the core chamber wall surface (4). A core chamber (6) is formed between the core chamber wall surface (4) and the core casing (7). An air intake annular cavity (3) is provided in the core casing and is located at the upstream position. The air intake annular cavity (3) is used to put the outer bypass flow channel (2) and the core chamber (6) in communication. An exhaust grille (5) is further provided on the core chamber wall surface (4) and is located at a tail position.

IPC Classes  ?

• F02C 7/18 - Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
• F02C 9/18 - Control of working fluid flow by bleeding, by-passing or acting on variable working fluid interconnections between turbines or compressors or their stages

Abstract

The present invention provides an on-orbit composite filament forming apparatus for space 3D printing, comprising a constant tension filament unwinding module, a replaceable resin filament rotary coating module, a melting and preheating chamber, a bent flow channel impregnation chamber, a variable-aperture resin recycle apparatus, a heat-insulation protective housing, a convection type cooling apparatus, a traction apparatus and a winding apparatus. The replaceable resin filament rotary coating module annularly rotates to enable a resin filament to wrap the surface of a carbon fiber, and is provided with at least one active filament unwinding roll; the filament unwinding roll is provided on a circular track centering on the carbon fiber; the melting and preheating chamber is used for melting the resin to wrap the surface of the fiber, and a lifting apparatus is provided for automatic opening and closing; the bent flow channel impregnation chamber forms a wedge-shaped high-pressure impregnation area by means of mutual pressing of an upper pressing block and a lower pressing block, so that the fiber impregnation quality is improved; and the variable-aperture resin recycle apparatus uses a gradient-adjustable blocking plate to scrape off redundant resin on the surface of the filament and store the resin in the recycle apparatus.

IPC Classes  ?

• B29C 70/52 - Pultrusion, i.e. forming and compressing by continuously pulling through a die

Abstract

The present invention provides a multi-arm forming apparatus for in-space on-orbit weaving of a composite material. The apparatus cooperatively controls a plurality of hot-pressing laying heads by means of rotary motion of a combination of annularly arranged mechanical arm type laying devices relative to a mold, thereby achieving efficient and high-degree-of-freedom winding, weaving and forming of a composite material component. Additionally, on the basis of the design of an air bag mold, contraction and expansion deformation of the air bag mold are achieved by means of inflation and deflation, and by means of switching of the structural size of the whole apparatus in an operating/non-operating state, the whole apparatus can be lightweighted, and the objective of facilitating rocket carrying and lifting-off, and demolding, repairing and weight reduction of a wound and weaved structural member under space environment operation is achieved. In addition, air in the air bag can also serve as emergency kinetic energy for motion and attitude adjustment of the whole apparatus in the space. Finally, the in-space on-orbit high-quality and high-efficiency winding, weaving and forming of the composite material are achieved.

IPC Classes  ?

• B29C 70/32 - Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or coreShaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core

Abstract

The present invention provides a multi-material additive manufacturing system for space on-orbit manufacturing, comprising an automatic material replacement tray device, a consumable bin, a master control center, and a forming bin. The master control center controls the overall operation of the system; a first tray, a second tray, and a third tray are provided inside the consumable bin; an automatic material replacement ring, a main wire feeding device, an induction heating nozzle, and a substrate are sequentially arranged on the forming bin; a first wire on the first tray sequentially passes through a first wire following device and a first auxiliary wire feeding device to be fed into the automatic material replacement ring; a second wire on the second tray sequentially passes through a second wire following device and a second auxiliary wire feeding device to be fed into the automatic material replacement ring; and a third wire on the third tray sequentially passes through a third wire following device and a third auxiliary wire feeding device to be fed into the automatic material replacement ring. According to the present invention, in order to achieve the miniaturization and intelligence of space on-orbit manufacturing equipment, the automatic material replacement tray device and the wire following devices are used, thereby achieving automatic material replacement and following after printing wires are used up.

IPC Classes  ?

• B29C 64/209 - HeadsNozzles
• B29C 64/295 - Heating elements
• B33Y 10/00 - Processes of additive manufacturing

Abstract

A frozen sand mold hollowed conformal design and low-temperature medium transmission freeze forming method, comprising: designing a corresponding frozen sand mold model according to a three-dimensional model of a casting, and arranging a cooling line (2) along the contour of the wall surface of a cavity (6) inside a frozen sand mold; performing hollowed design on the frozen sand mold provided with the cooling line; checking the strength of an established sand mold model by using finite element analysis software, and optimizing the design of the cooling line and a hollowed structure (5); generating contour information of each layer of printing section; printing a designed normal-temperature sand mold; and inserting a copper cooling pipe (7) into a preset complex cooling line to form a cooling channel, and introducing a low-temperature medium into the cooling channel for constant-time and constant-temperature heat exchange flowing to perform low-temperature freezing and curing on the frozen sand mold. According to the method, a hollowed sand mold provided with a conformal cooling channel is integrally formed by means of additive manufacturing technology, and heat is taken away in the form of effective heat exchange mainly based on heat conduction and heat convection in a cooling line by using a low-temperature medium and a normal-temperature sand mold, so as to form strong cold to make the frozen sand mold freeze quickly. Thus, the service life of a printing device is prolonged while the freezing efficiency is improved, the precision loss problem caused by sand block assembly is effectively prevented, the operation is simple, and the costs are low.

IPC Classes  ?

• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B33Y 10/00 - Processes of additive manufacturing
• B33Y 50/02 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• B22C 9/12 - Treating moulds or cores, e.g. drying, hardening
• B33Y 40/20 - Post-treatment, e.g. curing, coating or polishing

Abstract

Disclosed in the present invention is a design method for a high-degree-of-freedom parameterized frequency modulation coding waveform. The method comprises the following steps: S1, inputting a frequency modulation coding vector; S2, selecting a coding model order to be used; and S3, outputting a corresponding coding parameter value under the given frequency modulation coding vector and coding model order, and generating a frequency modulation coding waveform. Further disclosed in the present invention is a high-degree-of-freedom parameterized frequency modulation coding waveform. The waveform has a continuous phase function, accurate spectrum control and a parameterizable coding structure, can provide a smaller mismatch loss, higher in-band energy and lower autocorrelation sidelobes, and has wide application prospects in the field of radar.

IPC Classes  ?

• G01S 7/02 - Details of systems according to groups , , of systems according to group
• G06F 17/18 - Complex mathematical operations for evaluating statistical data

Abstract

A composite filament melt impregnation device with an automatic lifting channel for additive manufacturing includes a mechanical lifting device, a heating device, a curved resin impregnation channel, a filament guide block, a single screw extruder, a replaceable combination die nozzle, and a resin riser. The composite filament melt impregnation device can significantly improve the efficiency of replacing filaments and treating broken filaments in a forming process of continuous fiber filaments, reduce the operation difficulty of a production process, and ensure the safety of operators. The design of the resin riser can achieve slight dynamic adjustment of pressure in a melt cavity in the production process, improve the stability of product quality, and ultimately achieve continuous production and rapid replacement of high-performance continuous fiber composites.

IPC Classes  ?

• B29B 11/10 - Extrusion moulding
• B29B 11/16 - Making preforms characterised by structure or composition comprising fillers or reinforcements
• B29B 15/14 - Coating or impregnating of reinforcements of indefinite length of filaments or wires
• B29C 64/314 - Preparation
• B33Y 40/10 - Pre-treatment

Abstract

The present disclosure provides a negative torsion variable paddle and a control assembly thereof. The paddle includes rigid first paddles and rigid second paddles. When a driver pushes a root railing edge, the first paddle is not flexibly deformed, and the second paddle is torsionally deformed with a laminated elastomer structure between cascades to realize relative rotation at both ends of the second paddle, so that a flexible skin maintains airfoil contours, and the whole torsional degree of the paddle is changed. The present disclosure also provides a rotor craft including the negative torsion variable paddle.

IPC Classes  ?

• B64C 27/473 - Constructional features

Abstract

According to a surveying and mapping instrument and method for a wide-area spatial channel map through multi-unmanned aerial vehicle (UAV) cooperation, a measurement signal emission unit generates and emits a measurement signal, a measurement signal multi-UAV cooperative receiving unit receives the measurement signal transmitted through a wireless channel, extracts an effective multipath component from the measurement signal, and frames the effective multipath component and corresponding time and location information for storage, and transmits stored channel data to a channel data fusion processing unit offline, and the channel data fusion processing unit fuses the channel data in terms of space, time, and frequency dimensions, and completes missing channel data to construct a complete wide-area spatial channel map.

IPC Classes  ?

• G01C 21/00 - NavigationNavigational instruments not provided for in groups

Abstract

The present disclosure discloses a method and system for recognizing human action in an apron based on thermal infrared vision, the method comprises: acquiring a plurality of video sequences from an infrared monitoring video; labeling a set target in each image frame in each video sequence with a target box to obtain a target tracking result; intercepting, for each image frame in the video sequence, a target-box enlarged area according to the labeled target box; adding, for each image frame in the video sequence, the position information of the image labeled with target box to the target-box enlarged area to obtain a three-channel sub-image; training an action recognition model by using three-channel sub-image sequences corresponding to a plurality of video sequences as a training set, to obtain a trained action recognition model; obtaining a to-be-recognized video sequence from another infrared monitoring video, and obtaining a three-channel sub-image sequence corresponding to the to-be-recognized video sequence; inputting the three-channel sub-image sequence corresponding to the to-be-recognized video sequence into the trained action recognition model to output a target action type.

IPC Classes  ?

• G06V 40/20 - Movements or behaviour, e.g. gesture recognition
• G06V 10/77 - Processing image or video features in feature spacesArrangements for image or video recognition or understanding using pattern recognition or machine learning using data integration or data reduction, e.g. principal component analysis [PCA] or independent component analysis [ICA] or self-organising maps [SOM]Blind source separation
• G06V 10/774 - Generating sets of training patternsBootstrap methods, e.g. bagging or boosting
• G06V 20/40 - ScenesScene-specific elements in video content
• G06V 20/52 - Surveillance or monitoring of activities, e.g. for recognising suspicious objects
• G06V 20/70 - Labelling scene content, e.g. deriving syntactic or semantic representations

Abstract

An electrowetting effect-based solar-driven high efficiency humidification system and a working method. A photovoltaic power generation module and an electrowetting high efficiency humidification module are combined, which conform to a solar energy transfer principle in a PV/T device, while liquid droplets are also sprayed at regular intervals on an upper surface of a heat exchange flow channel in the PV/T device, the principles of acceleration of liquid droplet internal flow and a change to surface hydrophilicity/hydrophobicity by electrowetting technology are used, liquid drop evaporation is accelerated, and highly efficient humidification of air is achieved. By means of coupled utilization of electrowetting technology and a PV/T system, water is saved while a large amount of moist air and clean electric energy which can be used for actual production are obtained.

IPC Classes  ?

• B01B 1/00 - BoilingBoiling apparatus for physical or chemical purposes
• F28D 5/02 - Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
• H02S 40/44 - Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time

Abstract

Provided in the present invention is a heated-bed deformation tolerance structure for a large-sized continuous fiber high-temperature 3D printer. Changes in size caused by thermal expansion of a heated bed are compensated for by means of motion cooperation of a fixed heated-bed supporting assembly and a motion device, especially for a large-sized aluminum alloy material with a high coefficient of thermal expansion. A Z-direction motion structure of the structure is fixedly mounted on a frame and is located in a working environment at room temperature. A compensating motion module is fixedly mounted on a Z-axis and is not completely fixedly mounted on the heated-bed supporting assembly. The compensating motion module and the Z-axis are located in the working environment at room temperature. The heated-bed supporting assembly is not completely fixedly mounted and is partially located in a high-temperature cavity, with the highest working temperature being 300°C. The heated-bed supporting assembly retains motion redundancy in a thermal expansion deformation direction, tolerates thermal deformation, and compensates for metal deformation by means of a linear motion module and horizontal motion cooperation.

IPC Classes  ?

• B29C 64/20 - Apparatus for additive manufacturingDetails thereof or accessories therefor
• B29C 64/295 - Heating elements
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor

Abstract

A nozzle-replaceable printing head for continuous fiber printing and a printing method are provided. The printing head includes a fixed bracket, a wire feeding module located at an upper part of the structure, an upper guide pipe, a shearing module located at a middle part of the structure, a lower guide pipe, a heat dissipation sleeve, a throat pipe, a heating coil, and a nozzle module located at a bottom of the structure, where a continuous fiber reinforced thermoplastic resin matrix pre-impregnated composite wire coaxially penetrates through the other side of the printing head from top to bottom and is fed for printing. An adjustment groove with scales is configured to standardize adjustment on clamping and feeding states of pre-impregnated composite wires of different specifications.

IPC Classes  ?

• B29C 64/209 - HeadsNozzles
• B29C 64/118 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
• B29C 64/393 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• B33Y 10/00 - Processes of additive manufacturing
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor
• B33Y 50/02 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes

Abstract

The present invention provides a spatial curved surface printing path planning method based on dynamic contour offsetting and discretization. The method comprises: first, transversely and equally slicing a target model, and marking a single/double contour; second, performing central slicing on the model, discretizing a curvature contour, and calculating a contour offset feature value of each slice layer on the basis of a surface contour curvature of the model, so as to achieve dynamic contour offset filling in each horizontal slice; then longitudinally and equally cutting the slices to obtain spatial discrete points of the target model; and finally, constructing a virtual double contour for the single contour, and performing discrete point marking processing to obtain a discretized three-dimensional space equidistant lattice [n, j, m, 0/1, r] of the target model. Discrete points marked with the same r value within a single cutting plane are sequentially connected to obtain a spatial curve within the single cutting plane; the spatial curves within cutting planes are connected end to end in the order of the m value of the cutting plane to form single-layer spatial curved surfaces; and the single-layer spatial curved surfaces are sequentially connected end to end in the order of the r value, and are superimposed layer by layer to obtain an overall spatial curved surface path of the target model.

IPC Classes  ?

• B29C 64/386 - Data acquisition or data processing for additive manufacturing
• B33Y 50/00 - Data acquisition or data processing for additive manufacturing

Abstract

Disclosed in the present invention is a bend angle measuring method for bent pipe machining. The measuring method comprises the following steps: carrying out binarization and region-of-interest extraction on an image to be recognized, so as to obtain binarized images of two straight line segment regions, the image to be recognized being an image of a machined bent pipe; and, according to the binarized images of the two straight line segment regions, calculating a bend angle. The image-based online bend angle measuring method and system provided by the present invention have the advantages of low cost, high efficiency and high universality.

IPC Classes  ?

• G06V 10/28 - Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns

Abstract

Disclosed are a method, an apparatus and a non-transitory storage medium. The method includes: dividing satellites of the mega-constellation into satellite topology groups, so as to construct corresponding space-time grids, obtaining a dynamic matching relationship in time domain between the space-time grids and the satellite topology groups, setting a path weight for each space-time grid, acquiring a static grid path for forwarding a mission, where the static grid path is determined by an order of the space-time grids that need to be passed sequentially to forward the mission, adjusting the static grid path according to the satellite node currently receiving the mission and the dynamic matching relationship, so as to acquire the next satellite node to which the mission is forwarded from the satellite node currently receiving the mission.

IPC Classes  ?

• G05D 1/646 - Following a predefined trajectory, e.g. a line marked on the floor or a flight path
• G05D 1/644 - Optimisation of travel parameters, e.g. of energy consumption, journey time or distance

Abstract

A path planning method based on dynamic contour offset discretization and for spatial curved-surface printing is provided. Firstly, transversal equal slicing is carried out on a target model, and single/double contours are labeled; secondly, central slicing is carried out on the model, curvature contours are discretized, feature values of contour offsets of slice layers are calculated on the basis of a surface contour curvature of the model, and dynamic offset filling for inner contours of horizontal slices is realized; then longitudinal equal slicing is carried out on the slices, and spatial discrete points of the target model are obtained; and finally, virtual double contours are constructed for the single contours, and labeling processing for the discrete points is carried out, so that a discretized three-dimensional spatial equidistant lattice of the target model is obtained.

IPC Classes  ?

• G06T 15/00 - 3D [Three Dimensional] image rendering
• B29C 64/393 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• B33Y 50/02 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• G06F 30/10 - Geometric CAD
• G06F 113/10 - Additive manufacturing, e.g. 3D printing

Abstract

Provided are a nanocomposite dielectric film material for energy storage prepared by vertical self-assembly of lead zirconate titanate (PZT) and magnesium oxide (MgO), and a preparation method thereof. The method includes: 1, preparing a PZT powder; 2, mixing the PZT powder with an MgO powder to obtain a uniformly mixed PM composite powder; and mixing the PM composite powder with a binder, and subjecting a resulting mixture to tableting and cold isostatic pressing to obtain a PM composite target blank; 3, sintering the PM composite target blank at a temperature of not higher than 900° C. to obtain a PM composite target; and 4, subjecting the PM composite target to pulsed laser deposition to form an epitaxial vertical self-assembly composite dielectric film; and subjecting the epitaxial vertical self-assembly composite dielectric film to annealing to obtain the film material.

IPC Classes  ?

• C23C 14/08 - Oxides
• C23C 14/28 - Vacuum evaporation by wave energy or particle radiation
• C23C 14/58 - After-treatment

Abstract

The present invention discloses an integrated braiding and needle punching preform forming method, comprising the following steps: arranging gripping devices at both ends of a braiding machine, allowing a mandrel to move in a certain direction along the axis of the braiding machine while forming a first layer of fabric on a surface of the mandrel; then laying felt on top of the first layer of fabric by using an automatic felt laying device, and employing a needle punching device to perform pre-needle punching on the felt layer to ensure the felt adheres to the braided fabric surface; restarting the braiding machine, moving the mandrel in an opposite direction while forming a second layer of fabric on a surface of the felt; repeating the above steps to achieve multiple layers of braided fabric and felt in alternate adhesion; finally, performing main needle punching on the preform.

IPC Classes  ?

• D04C 3/48 - Auxiliary devices
• D04C 1/02 - Braid or lace, e.g. pillow-laceProcesses for the manufacture thereof made from particular materials
• D04C 3/46 - Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances with thread carriers supported on rolls

Abstract

A method for constructing a start performance model for a naval-ship gas turbine. The method comprises: firstly, establishing a gas turbine aerothermodynamics performance computation model on the basis of C++; establishing a gas turbine high-temperature component heat transfer model, a temperature sensor model and a control rule model on the basis of m language; then, on the basis of gas turbine start process test data, analyzing change rules of the pressure ratio and efficiency of a typical component of a gas turbine during a start process along with the physical rotation speed of a gas generator; and generating corresponding low-rotation-speed characteristics of a rotating component of the gas turbine and correcting same, so as to realize high-precision real-time simulation for the start performance of the gas turbine. In the method, the heat exchange between both high-temperature gas and the atmosphere of an external environment and a gas turbine body is taken into consideration, such that the precision of performance simulation for the start process of a gas turbine is improved, and a simulation test tool can be provided for the design and optimization of the start control rule of the gas turbine.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 119/08 - Thermal analysis or thermal optimisation

Abstract

An endogenous dynamic defense architecture-based multi-objective service function chain deployment method solves a problem of multi-objective deployment by constructing an endogenous dynamic defense architecture, in which a basic mode includes using moving target defense to ensure the security of VNFs, and an enhanced mode includes using mimic defense to perform security protection on the VNFs; in a construction module, a sub-pool division algorithm is proposed to divide a heterogeneous replica pool into a plurality of sub-pools, and VNFs are selected from the sub-pools so as to constitute a heterogeneous replica set; in a scheduling module, a replica VNF dynamic scheduling deployment algorithm is proposed, a deployment set is selected from the heterogeneous replica set for deployment, and is sent to a processing module; the input module replicas an input and distributes same to the processing module.

IPC Classes  ?

• H04L 9/40 - Network security protocols

Abstract

The present invention provides a hypersonic large internal contraction ratio air inlet channel having stepless adjustable air release valve, including an air inlet channel front body, an air-discharging slit cover plate, sidewalls, a lip cover, air-discharging cavities, valve plates, partition plates, a rotatable shaft, an expansion section and a driver. The valve plates are rotated through the driver according to the actual working conditions of air inlet channel, the minimum cross-section of the air discharging flow path is thus changed, and a stepless dynamic adjustment of the air discharging flow of the air inlet channel can be realized, so that the aerodynamic performance of the air inlet channel is improved, and the air discharging resistance of the air vehicle is reduced.

IPC Classes  ?

• F02K 7/10 - Plants in which the working-fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fanControl thereof characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines
• B64D 33/02 - Arrangement in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
• F02C 7/042 - Air intakes for gas-turbine plants or jet-propulsion plants having variable geometry

Abstract

A signal processing system and method for inductive oil abrasive particle sensor, comprising a sensor, an excitation signal generator, an analog signal processing circuit, a MCU signal acquisition module and a computer signal processing module is disclosed. The sensor is provided with two groups of induction coils, the excitation signal generator generates excitation signals and drives the excitation coils of the sensor to output induction signals containing abrasive particle information, and the analog signal processing circuit receives the induction signals output by the sensor and demodulates and amplifies the induction signals. The signal processing system of the sensor applied to online monitoring of oil abrasive particles is simple in structure and convenient to apply, has a complete signal statistics and monitoring interface, and can be used to effectively monitor the size, concentration and other information of the metal abrasive particles in oil in real time.

IPC Classes  ?

• G01N 33/28 - Oils
• G01N 27/02 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance

Abstract

A multi-path internally-microporous efficient refrigeration method and device for a frozen sand mold. The device comprises a frozen sand mold forming chamber (1), an electric lifting platform (2), a Teflon porous liner (3), a removable porous aluminum plate (4), a frozen sand mold refrigeration device box (5), a sealing cover plate (6), an ultrasonic piezoelectric plate (7), a U-shaped condensing tube (8), an ultrasonic generator (9), and a low-temperature refrigeration system (10), wherein the Teflon porous liner (3) and the removable porous aluminum plate (4) are provided with through hole structures with the same size and shape, and are configured for rapid cooling from a surface to a core of molding sand. By activating the electric lifting platform (2), the Teflon porous liner (3) rises to the highest point for ease of demolding. The ultrasonic piezoelectric plate (7) with a high-low frequency dual mode can be used not only to vibrate and compact the frozen sand mold, but also to assist cutting and forming. The device can realize quick freezing, easy demolding and low-cost digital forming of a frozen sand mold.

IPC Classes  ?

• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B22D 18/06 - Vacuum casting, i.e. making use of vacuum to fill the mould
• B33Y 10/00 - Processes of additive manufacturing
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor

Abstract

Disclosed in the present invention is a truss additive manufacturing device for aerospace. The whole device comprises five units: a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a transverse beam forming unit and a truss support unit, wherein the raw material input unit stores prepreg wires and prepreg tapes; rollers are driven by means of an electric motor to transmit the prepreg wires and the prepreg tapes forwards; the longitudinal beam forming unit consists of three sets of forming dies; V-shaped longitudinal beams are formed on the prepreg tapes by means of heating dies; the longitudinal beam traction unit uses a stepping motor to drive three sets of roller traction devices by means of a steering gear to pull the formed longitudinal beams; the transverse beam forming unit consists of a motion module and a printing module; and truss transverse beams are printed by means of fused deposition 3D printing.

IPC Classes  ?

• B29C 64/171 - Processes of additive manufacturing specially adapted for manufacturing multiple 3D objects
• B33Y 10/00 - Processes of additive manufacturing

Abstract

Disclosed in the present invention is a wire feeding mechanism suitable for fused deposition additive manufacturing of a flexible wire. The wire feeding mechanism comprises a supporting housing, wherein the lower end of the supporting housing is provided with a fusion spray head; a hook is connected to an inner wall of the top end of the supporting housing; a connecting rod is connected to an inner wall of one side of the supporting housing; a wire drawing mechanism is connected to one end of the connecting rod, and is located at the lower end of the hook; a limiting mechanism and a wire guiding mechanism are connected to the inner wall of one side of the supporting housing; the limiting mechanism is located at the lower end of the wire drawing mechanism; the wire guiding mechanism is located at the lower end of the limiting mechanism; the wire drawing mechanism comprises a supporting seat; the supporting seat is connected to the connecting rod; an inner wall of the top end of the supporting seat is provided with an electric sliding groove; an electric slider is movably engaged with an inner wall of the electric sliding groove; and a sixth support is connected to an outer wall of the top end of the electric slider. The wire feeding mechanism suitable for fused deposition additive manufacturing of a flexible wire disclosed in the present invention has the effect of reducing the risk of agglomeration at a joint between a wire and the hook.

IPC Classes  ?

• B29C 64/321 - Feeding
• B29C 64/118 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
• B33Y 40/00 - Auxiliary operations or equipment, e.g. for material handling

Abstract

An ultrasonic-assisted permeation and homogenization molding device and method for frozen printing liquid drops are provided. The device includes an ultrasonic generator, a transducer and an amplitude-change pole. The ultrasonic generator generates 20 KHz low-frequency ultrasonic waves, and a flange plate is arranged on a pitch surface of the amplitude-change pole and connected with an outer cavity wall of the low-temperature molding chamber by threads. According to the ultrasonic-assisted permeation and homogenization molding method for frozen printing liquid drops, pre-paved molding sand particles are homogenized and distributed under ultrasonic vibration by adjusting the frequency of the ultrasonic generator in a sand paving process. When a pure water binder is sprayed, liquid drops are sprayed to the surface of premixed molding sand, and then permeate to the bottom of pre-cooled molding sand under the assistance of low-frequency ultrasonic waves to freeze and solidify.

IPC Classes  ?

• B29C 64/165 - Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B33Y 10/00 - Processes of additive manufacturing
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor
• B33Y 80/00 - Products made by additive manufacturing

Abstract

A hot bed deformation tolerance structure for a large-sized continuous fiber high-temperature 3D printer is provided. Size changes caused by thermal expansion of a hot bed are compensated through motion coordination of a secured hot bed support assembly and a motion device, especially for an aluminum alloy material. A Z-direction motion structure of this structure is fixedly mounted with a frame and works at room temperature. A compensation motion module is fixedly mounted with a Z axis and incompletely secured with the hot bed support assembly, and works at room temperature with the Z axis. The hot bed support assembly is incompletely secured and partially in a high-temperature chamber, with a maximum working temperature of 300° C. The hot bed support assembly retains motion redundancy in a direction of thermal expansion deformation, tolerates thermal deformation through a linear motion module, and compensates for metal deformation through horizontal motion coordination.

IPC Classes  ?

• B29C 64/295 - Heating elements
• B29C 64/232 - Driving means for motion along the axis orthogonal to the plane of a layer
• B29C 64/245 - Platforms or substrates
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor
• B33Y 70/10 - Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials

Abstract

A numerical simulation optimization method of impact damage based on a laser mapped solid mesh is provided, including: measuring an impact damage size, a damage profile, a surface residual strain and a surface residual stress of a solid mesh element around the damage after firing a bullet by a light gas gun to impact a mesh area of a sample and obtaining the impact damage; establishing a parameterized impact finite element model to obtain a numerically simulated impact damage size, a numerically simulated impact damage profile, a numerically simulated surface residual strain and the surface residual stress of the surface solid mesh element; and calculating relative errors between the experimental measurements and the numerically simulated impact damage size, damage profile, surface residual strain and residual stress; and determining whether the relative errors are all less than expected values until a numerical simulation result meeting the accuracy requirements are obtained.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06T 17/20 - Wire-frame description, e.g. polygonalisation or tessellation
• G06F 111/10 - Numerical modelling
• G06F 119/02 - Reliability analysis or reliability optimisationFailure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]

Abstract

An air-ground joint trajectory planning and offloading scheduling method and system for distributed multiple objectives is provided. At the beginning of each timeslot, an unmanned aerial vehicle (UAV) selects a flight direction based on a total energy consumption of all devices and a total amount of unprocessed data of all the devices in the current system, and flies a fixed distance towards a certain direction. Before the UAV reaches a new location, each terrestrial user independently selects a task data offloading scheduling strategy based on the total energy consumption of all the devices and the total amount of the unprocessed data of all the devices in the current system. In order to improve an expected long-term average energy efficiency and data processing capability, the present disclosure also provides average feedbacks for an energy consumption and unprocessed data.

IPC Classes  ?

• G08G 5/00 - Traffic control systems for aircraft

Abstract

A multi-path internal microporous efficient refrigeration method and device for a frozen sand mold is provided. The device includes a frozen sand molding chamber, an electric lifting platform, a teflon porous lining, a removable porous aluminum plate, a frozen sand mold refrigeration device box, a sealing cover plate, an ultrasonic piezoelectric sheet, a U-shaped condenser tube, an ultrasonic generator, and a low-temperature refrigeration system. The teflon lining and the removable porous aluminum plate are provided with through hole structures of the same size and shape for rapid cooling from the surface to core of molding sand. The lifting platform is opened and the bumpy-ridge teflon lining rises to a highest point to facilitate demolding. The high- and low-frequency dual mode of the ultrasonic piezoelectric sheet can be used for vibrating and compacting the frozen sand mold, and can also assist in cutting forming.

IPC Classes  ?

• B22C 9/12 - Treating moulds or cores, e.g. drying, hardening
• B22C 9/02 - Sand moulds or like moulds for shaped castings

Abstract

A multi-robot collaborative planning method for machining a large capsule member of a spacecraft. The method comprises: for a multi-robot collaborative machining process of a large capsule member of a spacecraft, first, planning the number of instances of rotational displacement of a capsule, and the angle of each rotation; then, planning a multi-robot station layout and station switching strategy; and finally, when the position of the capsule and robot stations are fixed, planning a multi-robot machining task time sequence. By means of the method, the machining process of the large capsule member can be rapidly and systematically planned, and a scheme for the rotational displacement of the capsule and a scheme for the robot stations are rationally selected, thereby improving the rigidity of the collaborative operation of robots; and a machining time sequence is rationally planned, such that a multi-robot machining task process is more compact, and the idle time of the robots can be shortened, thereby improving the multi-robot collaborative machining efficiency.

IPC Classes  ?

• B25J 9/16 - Programme controls

Abstract

Provided are a piezoelectric composite material, an actuator, and a preparation method of the actuator, relating to the technical field of piezoelectric composite material actuators. The piezoelectric composite material includes an upper interdigital electrode layer, a piezoelectric fiber composite layer and a lower interdigital electrode layer which are arranged in sequence from top to bottom. The upper interdigital electrode layer, the piezoelectric fiber composite layer and the lower interdigital electrode layer each are of a parallelogram structure. A piezoelectric ceramic fiber array is embedded on the piezoelectric fiber composite layer; and the piezoelectric ceramic fiber array is of a parallelogram structure. By arranging the piezoelectric ceramic fiber array of the parallelogram structure, the effective area of an actuator can be increased, and then the actuation performance of the actuator can be improved.

IPC Classes  ?

• H10N 30/00 - Piezoelectric or electrostrictive devices
• H10N 30/06 - Forming electrodes or interconnections, e.g. leads or terminals
• H10N 30/092 - Forming composite materials
• H10N 30/20 - Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
• H10N 30/853 - Ceramic compositions
• H10N 30/87 - Electrodes or interconnections, e.g. leads or terminals

Abstract

A weaving and needling integrated preform formation method, comprising the following steps: moving a core mold (21) in a certain direction along an axis of a weaving machine (1) by arranging grabbing devices at two ends of the weaving machine (1), and at the same time, performing weaving to form a first layer of fabric (25) on the surface of the core mold (21); laying a mesh tire (26) above the first layer of fabric (25) by means of a mesh tire automatic laying device, and performing pre-needling on a mesh tire (26) layer by means of a needling device, so that the mesh tire (26) can fit the surface of woven fabric; activating the weaving machine (1) again, moving the core mold (21) in the opposite direction, and at the same time, performing weaving to form a second layer of fabric (28) on the surface of the mesh tire (26); repeating the above steps to realize alternate fitting of the multiple layers of woven fabric and the mesh tires (26); and finally, performing main-needling on a preform by means of the automatic needling device to realize Z-directional enhancement of the preform. Further provided is a preform formation device used to realize the weaving and needling integrated preform formation method.

IPC Classes  ?

• D04C 1/00 - Braid or lace, e.g. pillow-laceProcesses for the manufacture thereof
• D04C 3/00 - Braiding or lacing machines
• D04C 3/48 - Auxiliary devices
• D04H 1/46 - Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
• D04H 18/02 - Needling machines with needles

Abstract

An efficient parallelization and deployment method of a multi-objective service function chain based on a CPU+DPU platform solves the problem of multi-objective deployment by constructing a heterogeneous computing architecture composed of an orchestrator and a server based on a CPU+DPU structure; the orchestrator is responsible for receiving an SFC request from a network operator; an SFC deployment algorithm based on deep reinforcement learning is operated, including a parallel strategy, a VNF topological order strategy and a DPU processing strategy to obtain an optimal deployment scheme of each request; then a resource management module is invoked to manage resources; and finally, a driver module is invoked to transmit the deployment scheme to a server for placement, and the server completes the deployment of SFC by using the CPU or the DPU respectively according to the deployment scheme.

IPC Classes  ?

• H04L 67/61 - Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements
• G06F 9/48 - Program initiatingProgram switching, e.g. by interrupt
• G06F 9/50 - Allocation of resources, e.g. of the central processing unit [CPU]
• H04L 41/14 - Network analysis or design
• H04L 41/16 - Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using machine learning or artificial intelligence

Abstract

A wire feeding mechanism suitable for fused deposition Additive Manufacturing (AM) of a flexible wire is provided, which includes a support housing. A melting nozzle is arranged at the lower end of the support housing, a hook is connected to the inner wall of the top end of the support housing, a connecting rod is connected to the inner wall of one side of the support housing, a wire drawing mechanism is connected to one end of the connecting rod, the wire drawing mechanism is located at the lower end of the hook, a limiting mechanism and a wire guide mechanism are connected to the inner wall of one side of the support housing, the limiting mechanism is located at the lower end of the wire drawing mechanism, the wire guide mechanism is located at the lower end of the limiting mechanism.

IPC Classes  ?

• B29C 64/321 - Feeding
• B29C 64/118 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor

Abstract

An elastic cooperative inference architecture and method for UAV cluster can dynamically update the scheduling policy according to the status of each node, and can deal with the failure of some nodes. In addition, the elastic cooperative inference architecture and method can process larger scale complex models on the embedded devices with limited performance carried by UAVs by means of cooperative inference, so as to improve the accuracy of intelligent applications. At the same time, the elastic cooperative inference architecture and method can adaptively update the allocation strategy when some nodes are unavailable or recovered, and improve the survivability of UAV cluster through elastic coordination.

IPC Classes  ?

• H04W 16/26 - Cell enhancers, e.g. for tunnels or building shadow

Abstract

An additive manufacturing device for an aerospace truss includes a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a cross beam forming unit and a truss support unit. The raw material input unit stores pre-impregnated wires and pre-impregnated tapes, and a motor drives rollers to convey the pre-impregnated wires and the pre-impregnated tapes forward; the longitudinal beam forming unit is composed of three sets of forming molds, and the pre-impregnated tapes form V-shaped longitudinal beams through heating molds; a stepper motor used in the longitudinal beam traction unit drives three sets of roller traction devices through steering gears to pull formed longitudinal beams; the cross beam forming unit is composed of a motion module and a printing module, and a truss cross beam is printed through a 3D printing method of molten deposition.

IPC Classes  ?

• B29C 64/218 - Rollers
• B29C 64/236 - Driving means for motion in a direction within the plane of a layer
• B29C 64/295 - Heating elements
• B29L 31/30 - Vehicles, e.g. ships or aircraft, or body parts thereof
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor
• B33Y 80/00 - Products made by additive manufacturing

Abstract

A helicopter active noise suppression device integrating a sound array and on-propeller control, which relates to the technical field of helicopter noise reduction, includes an annular loudspeaker array, a plurality of force exciters, an error microphone, an Active Noise Cancellation (ANC) controller, a cockpit sensor, and an airborne computer. The annular loudspeaker array is arranged at a rotor hub and unsteady force exciters are arranged at each blade trailing edge to construct a sound field in an reversed phase to the sound wave of an original sound field with an ANC principle, thereby counteracting the noise and realizing the noise reduction of all-domain and all-type helicopter noise.

IPC Classes  ?

• B64C 27/00 - RotorcraftRotors peculiar thereto
• G10K 11/178 - Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effectsMasking sound by electro-acoustically regenerating the original acoustic waves in anti-phase

Abstract

A low-temperature airflow follow-up auxiliary sand discharge apparatus for cutting a frozen sand mold includes a frozen sand mold to be machined, a hollow cutter, a spindle mounted on the hollow cutter, an air pipe, and a refrigeration apparatus connected to one end of the air pipe. The refrigeration apparatus is fixed to an air pump by a valve. An inner cavity of the hollow cutter is provided with a cutter through hole along an axis. An inner cavity of the spindle is provided with a spindle through hole along the axis. An upper end of the spindle is provided with a bearing seat hole for placing a bearing. An outer circle of the bearing matches the bearing seat hole, and an inner circle of the bearing is mounted with an air pipe connector. The air pipe is connected and fixed to the air pipe connector.

IPC Classes  ?

• B23B 27/10 - Cutting tools with special provision for cooling
• B23B 51/04 - Tools for drilling machines for trepanning

Abstract

The present disclosure discloses a trans-media unmanned aerial vehicle device and a control method thereof. The trans-media unmanned aerial vehicle device includes a housing, and a piston which is arranged in the housing and is capable of moving in a reciprocating manner in the housing; one end of the housing is provided with an opening; several flying wings are uniformly arranged in a circumferential direction of the piston; the flying wings are rotatably connected to a side of the piston facing the opening and are spread or retracted like an umbrella; and under the pushing of the piston, the flying wings can be spread to the outside of the housing and retracted back into the housing.

IPC Classes  ?

• B64U 20/50 - Foldable or collapsible UAVs
• B64U 10/10 - Rotorcrafts
• B64U 20/75 - Constructional aspects of the UAV body the body formed by joined shells or by a shell overlaying a chassis
• B64U 70/00 - Launching, take-off or landing arrangements

Abstract

The present invention provides an unmanned aerial vehicle conflict detection method and apparatus of an airspace digital grid and a storage medium. The method comprises: establishing an airspace discrete subdivision grid model; constructing a grid coding rule and a conversion relationship of the longitude and latitude coordinates and grid codes; establishing an unmanned aerial vehicle safety protection area to perform gridding representation on an unmanned aerial vehicle in the airspace; establishing a coordinate system to convert the grid codes of the unmanned aerial vehicle into coordinates; utilizing a GJK algorithm to calculate a Minkowski difference set of two blocks; and determining whether the unmanned aerial vehicle conflicts or not according to the Minkowski difference set. By combining airspace grid codes with the GJK algorithm, compared with the traditional paired coordinate operation, the complexity of conflict detection can be effectively reduced, a large amount of calculation time can be saved, and the efficiency of unmanned aerial vehicle conflict detection can be effectively improved, to satisfy rapid real-time conflict detection requirements for the unmanned aerial vehicle in the airspace.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G01C 21/22 - Plotting boards
• G06F 119/02 - Reliability analysis or reliability optimisationFailure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]

Abstract

The present disclosure belongs to the technical field of ultrasonic non-destructive testing, and discloses a method for extracting feature path signals of pipeline ultrasonic helical guided waves. The method includes: transforming a nonlinear wave number relationship of a pipe wall into a linear form by first order Taylor expansion, the approximation being reasonable under narrow band excitation; on this basis, establishing multimodal and multipath guided wave propagation over-complete data sets, and obtaining a modal weight factor and a path weight factor through a single-layer neural network algorithm; and multiplying the modal weight factor by the multimodal data set to separate a plurality of groups of unimodal signals from a whole signal, and multiplying the path weight factor by the multipath data set to extract unimodal feature path signals. The present disclosure can effectively extract unimodal unipath guided wave feature signals and improve the signal identification, and has broad prospects.

IPC Classes  ?

• G01N 29/46 - Processing the detected response signal by spectral analysis, e.g. Fourier analysis
• G01N 29/04 - Analysing solids

Abstract

The present disclosure relates to a method and system for detecting a structural defect in additive manufacturing. The method includes: layering a three-dimensional model of an additive manufacturing test piece to obtain a two-dimensional contour of an interface of each layer, and generating a machining path; arranging a non-contact sensor at a fixed measuring point of the additive manufacturing test piece, and acquiring an ultrasonic signal at each machining point when a pulse laser conducts machining point by point along the machining path; forming a visual ultrasonic field based on all the ultrasonic signals, and determining ultrasonic field data; determining, based on the ultrasonic field data, a curve of a peak of an incident wave changing with the machining path; and determining whether a machining defect exists at the machining points based on the curve of the peak of the incident wave changing with the machining path.

IPC Classes  ?

• G01N 29/06 - Visualisation of the interior, e.g. acoustic microscopy
• G01N 29/46 - Processing the detected response signal by spectral analysis, e.g. Fourier analysis
• G01N 29/22 - Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic wavesVisualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object Details
• B33Y 40/00 - Auxiliary operations or equipment, e.g. for material handling
• B33Y 50/00 - Data acquisition or data processing for additive manufacturing

Abstract

A multi-view outlier detection algorithm based on the tensor representation is provided. Specifically, the multi-view data are firstly transformed into a set of tensors, and then its low-rank representation is learned. Finally, an outlier function is designed in the case of tensor representation to realize detection.

IPC Classes  ?

• G06F 17/16 - Matrix or vector computation
• G06F 17/11 - Complex mathematical operations for solving equations

Abstract

A multi-degree-of-freedom additive manufacturing based printing method for a helmet. The method comprises: first printing a helmet supporting mold (2) on the basis of the inner surface of a target helmet and by using water-soluble resin; on the basis of the thickness of a feature layer, performing curved-surface equidistant offset layering on a model of the target helmet from inside to outside starting from the inner surface; on the basis of the integrity of a curved-surface layer and by taking a substrate and protrusions as segmentation targets, performing region-by-region traversal and segmentation from inside to outside, and storing slice information; performing shaping processing for an inward shrinking wall thickness on all protruding regions which have been subjected to traversal and segmentation; on the basis of the settings of filling parameters, obtaining filling information of each layer of series curved surfaces of a target workpiece; by means of a multi-degree-of-freedom printing device, performing layer-by-layer filling on a supporting mold along a path setting, so as to complete printing of the target helmet; and finally, placing the helmet and the supporting mold together into a water tank, such that after the mold is dissolved, a final target helmet workpiece (1) is obtained. In the method, a new idea and a new method are provided for realizing additive manufacturing of a helmet workpiece which is of a complex curved-surface structure.

IPC Classes  ?

• B29C 64/106 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
• B29C 64/386 - Data acquisition or data processing for additive manufacturing
• B29C 64/393 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes

Abstract

A stepless-adjustment efficient additive manufacturing device for a specially shaped rotary body sand mold, the device comprising an aluminum alloy frame (1), and an ink jet system, a shakeout device, a sand scraping device and a Z-axis rotary lifting movement system, which are arranged on the aluminum alloy frame. In the device, quantitative shakeout and uniform sand spreading are implemented on a rotary printing platform by keeping a shakeout box (7), a printing nozzle (3) and a sand scraping plate fixed, and the rotary printing platform can descend accurately and controllably by means of a ball screw (21) device, thereby spreading sand layer by layer and performing printing layer by layer; in addition, the height by which the rotary platform descends is adjusted steplessly, and resin saturation between molding sand particles is adjusted according to a micro-droplet jet printing grayscale, thereby improving the overall printing speed and strength of a sand mold. Further disclosed is a stepless-adjustment efficient additive manufacturing method for a specially shaped rotary body sand mold. The device achieves, with stepless heightwise adjustment, 3D printing of a specially shaped rotary body sand mold. When manufacturing specially shaped rotary bodies, the specially shaped rotary body sand mold has a high forming efficiency and can manufacture specially shaped rotary bodies with a good quality; in addition, the process cost and waste are reduced.

IPC Classes  ?

• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B33Y 10/00 - Processes of additive manufacturing
• B22C 19/04 - Controlling devices specially designed for moulding machines
• B22C 19/02 - Mould tables

Abstract

A method for preparing a negative pressure film-covering frozen sand mold includes: directly obtaining a mold cavity of a sand mold through numerically controlled machining of a frozen sand blank; covering a surface, brushed with a thermal insulation coating, of the mold cavity of the sand mold with a softened thin film, and covering an outer surface of the sand mold with a back film to seal a sand box; fixing the frozen sand mold in an air extraction sand box with a vacuum chamber, and extracting air through a vacuum pump, so that the thin film tightly adheres to the sand mold through vacuum suction force; and closing the box to obtain an integral sand mold, and pouring a casting at room temperature or low temperature under negative pressure. The method is environment-friendly, and the prepared frozen sand mold has high strength and is convenient for sand cleaning.

IPC Classes  ?

• B22C 9/12 - Treating moulds or cores, e.g. drying, hardening
• B22C 9/03 - Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Abstract

Disclosed in the present invention is a low-light image enhancement method based on reinforcement learning and aesthetic evaluation. The method comprises: firstly, generating images of an abnormal brightness in different illumination scenes, and constructing a training data set of a reinforcement learning system on the basis of the images; then initializing the training data set, a policy network and a value network in the reinforcement learning system, and updating the policy network and the value network on the basis of a non-reference reward value and an aesthetic evaluation reward value; and outputting an enhanced image result after training is completed. By means of the present invention, an action space range which is defined in reinforcement learning is expanded, such that an enhancement operation which is obtained by an input low-light image has a larger dynamic range, thereby achieving higher flexibility for a real scene, and low-light image enhancement requirements in the real scene can thus be better satisfied. In addition, scores of aesthetic quality evaluations are introduced as a part of a loss function, so that an enhanced image has a better visual effect and a better subjective user evaluation score.

IPC Classes  ?

• G06T 5/00 - Image enhancement or restoration
• G06T 7/90 - Determination of colour characteristics
• G06N 20/00 - Machine learning

Abstract

An extreme high-temperature in-situ tenon joint fretting fatigue experimental apparatus, comprising: a loading member (100) used for supporting a tenon test piece (001) and a mortise test piece (002), and applying periodic reciprocating horizontal fatigue load to the tenon test piece (001); a heating member (200) provided below the tenon test piece (001) and the mortise test piece (002) and used for heating the tenon test piece (001) and the mortise test piece (002); a thermal insulation sleeve (300) wrapping the heating member (200); and a control member (400) used for controlling on or off of the loading member (100) and the heating member (200) to apply horizontal fatigue load to the tenon test piece (001) and heating the tenon test piece (001) and the mortise test piece (002). Hot electrons entering a detector are reduced by using a variety of measures, thereby improving the imaging quality of an in-situ scanning electron microscope in an extreme high-temperature environment, and improving the upper limit of experimental temperature. The problem that the high-temperature imaging quality is degraded, the image is whitened, and effective information cannot be observed and the like due to the fact that hot electrons generated by a heating apparatus or a sample in a high-temperature environment interfere with collection of signal electrons performed by the detector is solved.

IPC Classes  ?

• G01N 3/36 - Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
• G01N 3/02 - Investigating strength properties of solid materials by application of mechanical stress Details
• G01N 3/04 - Chucks
• G01N 1/44 - Sample treatment involving radiation, e.g. heat
• G01N 23/2251 - Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups , or by measuring secondary emission from the material using electron or ion microprobes using incident electron beams, e.g. scanning electron microscopy [SEM]

Abstract

A three-dimensional (3D) spectrum situation completion method and device based on a generative adversarial network includes performing graying and coloring preprocessing based on incomplete 3D spectrum situations from historical or empirical spectrum data obtained by a UAV through sampling a target region, obtaining three-channel incomplete 3D spectrum situation maps displayed in colors, forming a training set based on the incomplete 3D spectrum situation maps; training the generative adversarial network based on the training set and obtaining a trained generator network in the generative adversarial network, performing graying and coloring preprocessing based on a measured incomplete 3D spectrum situation obtained by the UAV through sampling a specified measurement region, obtaining a three-channel measured incomplete 3D spectrum situation map displayed in colors, and using the measured incomplete 3D spectrum situation map as input data to the generator network to obtain a three-channel measured complete 3D spectrum situation map displayed in colors.

IPC Classes  ?

• G06T 11/00 - 2D [Two Dimensional] image generation
• G06T 7/90 - Determination of colour characteristics

Abstract

The present invention provides a method for preparing a negative-pressure film-coated frozen sand mold. The method for preparing the frozen sand mold comprises the following steps: numerical control processing is directly performed on a frozen sand blank to obtain a sand mold cavity; a softened thin film is coated on the surface of the sand mold cavity coated with a heat insulation coating, and meanwhile, a back film is coated on the outer surface of the sand mold to close a sand box; an air extraction sand box provided with a vacuum air chamber is used for fixing the frozen sand mold, air extraction is performed by means of a vacuum pump, and the thin film is tightly attached to the sand mold by means of vacuum suction force; and the whole sand mold is obtained after boxes are combined, negative pressure is kept, and a casting is poured in a normal-temperature or low-temperature environment. The method is environment-friendly and green, and the prepared frozen sand mold is high in strength and convenient to clear sand; the volume of gas generated in the pouring process is small, metal is rapidly solidified, and castings having good internal quality, high size precision, and excellent surface quality can be produced.

IPC Classes  ?

• B22D 18/06 - Vacuum casting, i.e. making use of vacuum to fill the mould

Abstract

A high-flexibility multi-region sand-spreading device for multi-material sand-mold printing. The sand-spreading device comprises a printing mechanism (1), a compaction mechanism (2), a vibratory sand-spreading mechanism (3), a machine base ball-screw mechanism (4), a supporting plate (5), a machine base (6) and a ball-screw mechanism (17), wherein the vibratory sand-spreading mechanism, the compaction mechanism and the printing mechanism are mounted on the supporting plate, and jointly slide on the machine base ball-screw mechanism during printing, so as to sequentially complete sand-spreading, compaction and printing operations in a printing region; a sand-spreading box (13) of the vibratory sand-spreading mechanism and a follow-up sand-spreading mechanism are connected to the ball-screw mechanism by means of a moving slide table to achieve two-dimensional movement, and a pressing plate (22) of the compaction mechanism controls lifting by using an electric pushing cylinder (19), a lifting guide column (20) and a bearing (23), so as to achieve a compaction operation after sand-spreading; and the printing mechanism comprises a nozzle transverse beam component (24), a drag chain (25), a transverse base (26) and a print head component (27), and the print head component is driven by the transverse base and the drag chain to achieve two-dimensional movement printing. Further provided is a high-flexibility multi-region sand-spreading method for multi-material sand-mold printing. By means of the device and the method, the printing precision and the flexibility manufacturing capability of multi-material sand-mold integral printing and forming equipment can be improved.

IPC Classes  ?

• B22C 9/02 - Sand moulds or like moulds for shaped castings
• B33Y 30/00 - Apparatus for additive manufacturingDetails thereof or accessories therefor

Abstract

The present invention relates to the field of computer numerical simulation, and provides a helicopter flow field numerical simulation system and method based on a graphics processing unit (GPU). The helicopter flow field numerical simulation system comprises a central processing unit (CPU) (1) and a GPU (2); the CPU (1) is used to: initialize a motion nested grid according to a preset configuration file and a helicopter grid file to be simulated (S1); determine surface batch information according to grid blocks in the motion nested grid (S2); and determine a nested interpolation relationship and an interpolation mapping index between the grid blocks according to the helicopter grid file to be simulated at a current simulation moment, and perform flow field information interaction among the grid blocks according to the nested interpolation relationship, the interpolation mapping index, and flow field information of the grid blocks to obtain flow field information of the helicopter to be simulated (S4); and the GPU (2) is used to calculate the flow field information of the grid blocks in the motion nested grid according to the surface batch information by using a computational fluid dynamics (CFD) method (S3). The CPU and the GPU are combined, such that the simulation efficiency of a helicopter flow field is improved.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]

Abstract

A nozzle-replaceable print head for continuous fiber printing, and a printing method. The print head comprises a fixing support (0200), a wire feeding module (0300) located on the upper part of a structure, an upper guide tube (0400), a shearing module (0500) located at the middle of the structure, a lower guide tube (0600), a heat dissipation sleeve (0700), a throat tube (0800), a heating coil (0900), and a nozzle module (1000) located at the bottom of the structure, wherein a continuous fiber-reinforced thermoplastic resin-based pre-impregnated composite wire (0100) coaxially passes through the print head from the other side from top to bottom and is fed for printing. By providing an adjusting groove having a scale indicator, clamping and feeding states of pre-impregnated composite wires (0100) of different specifications are standardized and adjusted; and by providing the upper guide tube (0400) and the half-wrapped lower guide tube (0600), the shearability of the pre-impregnated wires and the subsequent feeding of the broken wires are improved, so that high-efficiency and high-quality formation of a workpiece is achieved, and heterogeneous multi-layer forming printing of a workpiece having a specific application requirement can be achieved.

IPC Classes  ?

• B29C 64/209 - HeadsNozzles
• B29C 64/118 - Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
• B33Y 50/02 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes

Abstract

Disclosed in the present invention is a composite material filament melt impregnation device having an automatically-liftable flow channel used for additive manufacturing, which comprises a mechanically lifting device, a heating device, a curved resin impregnation flow channel, a filament-guiding block, a single-screw extruder, a replaceable combined mold nozzle and a resin riser. The present invention can greatly improve the efficiency of replacing filaments and dealing with broken filaments during a continuous fiber filament forming process, thereby reducing the operation difficulty in the production process and guaranteeing the safety of operators. By designing the resin riser, the internal pressure of a melt cavity can be dynamically adjusted within a small range during the production process, so that the product quality stability is improved, and finally, the continuous production and rapid replacement of high-performance continuous fiber composite material filaments are achieved.

IPC Classes  ?

• B29B 11/10 - Extrusion moulding
• B29B 11/16 - Making preforms characterised by structure or composition comprising fillers or reinforcements
• B29C 64/314 - Preparation
• B33Y 40/10 - Pre-treatment

Abstract

The present disclosure provides an electrochemical machining device and a method for a blisk using an electrode array, which relate to the technical field of electrochemical machining. The electrochemical machining device comprises an outer ring-shaped rotating ring, an inner ring-shaped base and a plurality of cathode rods. An inner diameter of the outer ring-shaped rotating ring is larger than an outer diameter of the inner ring-shaped base, and an inner diameter of the inner ring-shaped base is larger than an outer diameter of the blisk. The outer ring-shaped rotating ring and the inner ring-shaped base are coaxially arranged. Middle parts of the cathode rods are connected with the inner ring-shaped base, outer ends of the cathode rods are rotatably connected with the outer ring-shaped rotating ring, and inner ends of the cathode rods are provided with trepanning cathode pieces or radial feeding electrodes.

IPC Classes  ?

• B23H 9/10 - Working turbine blades or nozzles
• B23H 3/04 - Electrodes specially adapted therefor or their manufacture
• B23H 7/12 - Rotating-disc electrodes

Abstract

Disclosed are a multi-channel electrochemical machining device and method for a blisk, and relate to the technical field of blisk electrochemical machining. The multi-channel electrochemical machining device for a blisk comprises an electrolytic bath used for accommodating an electrolyte, a blisk workpiece, a tube electrode and a top cover plate. The top cover plate is located above the blisk workpiece. An electrolysis chamber used for the tube electrode to electrolyze the blisk workpiece is formed between the lower surface of the top cover plate and the surface of the blisk workpiece. The electrolysis chamber communicates with the electrolytic bath. A drainage seam communicating the electrolysis chamber and the electrolytic bath along the axial direction of the blisk workpiece is formed in the upper surface of the top cover plate.

IPC Classes  ?

• B23H 3/04 - Electrodes specially adapted therefor or their manufacture
• B23H 3/10 - Supply or regeneration of working media
• B23H 9/10 - Working turbine blades or nozzles
• B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for