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US 10,472,037 B2Granted
Method of decreasing pressure fluctuation on hull of twin-propeller ship by adjusting rotation angles of two propellers
AssigneeKorea Institute of Ocean Science & Technology
InventorsCheol Soo Park, Gun Do Kim, Youngha Park
Life of this patent
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Abstract
Disclosed is a method of decreasing pressure fluctuation induced on a surface of a hull due to propeller cavitation by adjusting a relative rotation angle of propellers of a twin-propeller ship.
Claims5
A method of decreasing pressure fluctuation due to cavitation on a hull of a twin-propeller ship by adjusting a relative rotation angle between two propellers, the method comprising:
- adjusting a phase difference in a pressure fluctuation-time history so as to decrease total pressure fluctuation due to cavitation induced by the two propellers of the twin-propeller ship on the hull of the ship,
- wherein the adjusting of the phase difference in the pressure fluctuation-time history is performed by adjusting the relative rotation angle between the two propellers so that the total pressure fluctuation due to cavitation is decreased by destructive interference between the pressure fluctuation associated with each of the two propellers.
A method of decreasing pressure fluctuation due to cavitation on a hull of a twin-propeller ship by adjusting a relative rotation angle between the two propellers, the method comprising:
- calculating, by an optimum-phase calculator at step S1, an optimum relative rotation angle between the two propellers such that the total pressure fluctuation due to cavitation is decreased by destructive interference between the pressure fluctuation associated with each of the two propellers, and outputting information on the calculated optimum relative rotation angle to a controller;
- collecting, by encoders respectively provided to shafts at step S2, information on rotations per minute (RPM) and a rotation angle of each of the two propellers, and outputting the collected information to the controller;
- calculating, by the controller at step S3, a relative rotation angle between the two propellers, and comparing the relative rotation angle with the optimum relative rotation angle, the controller outputting a control command to a propeller phase control system to tune the relative rotation angle to the optimum relative rotation angle;
- and
- controlling, by the propeller phase control system at step S4, the relative rotation angle of the two propellers to be tuned to the optimum relative rotation angle in compliance with the control command from the controller.
2 more elements
Dependencies are inferred from the claim text.