Abrégé

[Problem] To provide a method for further reducing the friction resistance of a friction resistance reduced ship. [Solution] Rolling and pitching vary greatly depending on variations in climate, etc.; however, when limited to an extremely short time, the rolling and pitching repeat in an almost identical or similar pattern. Therefore, if the pattern of the immediately preceding rolling and pitching is understood, the subsequent pattern can also be predicted. This is similar for vertical position variation patterns of minute bubble generation units calculated from the angle of the rolling and pitching. Furthermore, the vertical position variation also differs depending on the installation position of each minute bubble generation unit, so the present invention measures the vertical position variation for each minute bubble generation unit, while also predicting the vertical position variation at and after the current time. The predicted vertical position variation is compared with the waterline height, while the time at which the minute bubble generation units below the sea surface will be above the sea surface or the time at which the minute bubble generation units above the sea surface will be below the sea surface are predicted, and an ON/OFF valve 8 is switched at that time.

Classes IPC  ?

• B63B 1/38 - Autres moyens pour faire varier les caractéristiques hydrodynamiques inhérentes aux coques par réduction du frottement utilisant des bulles d'air ou des coussins d'air

Abrégé

[Problem] To provide a method for further reducing friction resistance of a friction resistance reduced ship. [Solution] Rolling and pitching vary greatly depending on variation in climate etc., but when limited to an extremely short time, the rolling and pitching repeat an almost identical or similar pattern. Therefore, if the pattern of the immediately preceding rolling and pitching is understood, the subsequent pattern can also be predicted. This is similar for a vertical position variation pattern of minute bubble generation units calculated from the angle of the rolling and pitching. Furthermore, the vertical position variation also differs depending on the installation position of each minute bubble generation unit, and thus the present invention measures the vertical position variation for each minute bubble generation unit and also predicts vertical position variation at and after the current time. The predicted vertical position variation is compared with a waterline height, and the time at which the minute bubble generation units below the sea surface will be above the sea surface or the time at which the minute bubble generation units above the sea surface will be below the sea surface are predicted, and an ON/OFF valve 8 is switched at that time.

Classes IPC  ?

• B63G 8/34 - Camouflage
• B63B 1/36 - Autres moyens pour faire varier les caractéristiques hydrodynamiques inhérentes aux coques par réduction du frottement utilisant des moyens mécaniques
• B63B 1/38 - Autres moyens pour faire varier les caractéristiques hydrodynamiques inhérentes aux coques par réduction du frottement utilisant des bulles d'air ou des coussins d'air

Abrégé

A ship is provided with microbubble generators attached below the waterline to supply microbubbles, which decrease the ship's frictional resistance during navigation and improve fuel efficiency. The below waterline region (L.W.L.) of the ship is divided into an upper region (R1) proximate the waterline, and a lower region (R2) proximate the ship's bottom. The air supply to the microbubble generators (10) in the upper region (R1) is performed through a pipe (3), one end of which is exposed to the atmosphere. The air supply to the microbubble generators (10) in the lower region (R2) is performed through a branch pipe (6) from a pipe (5) using an assist compressor (4), which is arranged as a closed system instead of being exposed to the atmosphere.

Classes IPC  ?

• B63B 1/34 - Autres moyens pour faire varier les caractéristiques hydrodynamiques inhérentes aux coques par réduction du frottement
• B63B 1/38 - Autres moyens pour faire varier les caractéristiques hydrodynamiques inhérentes aux coques par réduction du frottement utilisant des bulles d'air ou des coussins d'air