Abstract

detdet) from the equalized power spectral density (Q), and identifying (217) a failure in the rotary mechanical system from the extracted peaks.

IPC Classes  ?

• G01M 15/12 - Testing internal-combustion engines by monitoring vibrations
• G01M 15/14 - Testing gas-turbine engines or jet-propulsion engines
• G01M 13/028 - Acoustic or vibration analysis

Abstract

The invention relates to a method for monitoring a turbine engine, said method comprising, for at least one blade (PAL) of a rotor with which the turbine engine is equipped, the steps of: - obtaining (E30) a plurality of samples (Ej) of at least one analogue time signal (SIG) acquired by means of at least one fixed proximity sensor and representing a passage of said at least one blade in front of said at least one proximity sensor; - calculating (E60) a deflection (dj) of said at least one blade for each of said samples: - determining (E70), in the form of a linear combination of sinusoidal signals, a so-called "approximation signal" (SIG_APPROX), minimising a cost function evaluating a deviation between said calculated deflections and said approximation signal; and - monitoring (E80) the vibratory behaviour of said at least one blade on the basis of frequencies and/or amplitudes and/or phases of the sinusoidal signals that make up said approximation signal.

IPC Classes  ?

• G01M 5/00 - Investigating the elasticity of structures, e.g. deflection of bridges or aircraft wings
• G01M 15/14 - Testing gas-turbine engines or jet-propulsion engines
• G01M 7/00 - Vibration-testing of structuresShock-testing of structures

Abstract

The invention relates to the use of a composite material for the manufacture of a containment device for a cryogenic liquid and also to a device for the containment of a cryogenic liquid which comprises at least one layer made of this composite material. The composite material is obtained from a composition which comprises, in weight percentages relative to the total weight of the composition: - from 60% to 90% of a polyamide selected from polyamides 6, 6,6 and 6/6,6 and mixtures thereof; - from 10% to 30% of a primary synthetic graphite that is in the form of particles; and - from 0% to 10% of an antioxidant. Applications: manufacture of cryogenic tanks and, in particular, of liquid oxygen tanks, in particular for a space launcher; manufacture of supply lines for cryogenic liquids and, in particular, for liquid oxygen; manufacture of any device allowing the storage, transport and/or supply of a pressurized gas.

IPC Classes  ?

• C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chainCompositions of derivatives of such polymers
• F16J 12/00 - Pressure vessels in general
• F17C 1/04 - Protecting sheatings
• F17C 1/12 - Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
• F17C 1/16 - Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials

Abstract

The invention relates to the use of a composite material for the manufacture of a containment device for a cryogenic liquid and also to a device for the containment of a cryogenic liquid which comprises at least one layer made of this composite material. The composite material is obtained from a composition which comprises, in weight percentages relative to the total weight of the composition: - from 60% to 90% of a polyamide selected from polyamides 6, 6,6 and 6/6,6 and mixtures thereof; - from 10% to 30% of a primary synthetic graphite that is in the form of particles; and - from 0% to 10% of an antioxidant. Applications: manufacture of cryogenic tanks and, in particular, of liquid oxygen tanks, in particular for a space launcher; manufacture of supply lines for cryogenic liquids and, in particular, for liquid oxygen; manufacture of any device allowing the storage, transport and/or supply of a pressurized gas.

IPC Classes  ?

• C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chainCompositions of derivatives of such polymers
• F16J 12/00 - Pressure vessels in general
• F17C 1/04 - Protecting sheatings
• F17C 1/12 - Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
• F17C 1/16 - Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials