A hull pressure fluctuation reduction method for a ship with twin propellers using real-time vibration information and propeller rotation angle control

摘要

The present invention relates to a method to reduce pressure fluctuation through real-time vibration information of a twin axial line and rotation angle control of a propeller, capable of reducing fluctuation pressure induced on a hull surface by propeller cavitation. According to the present invention, the method to reduce pressure fluctuation comprises: a step (S0) of allowing a vibration sensor system to measure a vibration signal by each relative rotational angle of two propellers and transfer measured vibration signal information to a vibration analysis system; a step (S1) of allowing the vibration analysis system to analyze the vibration signal by each relative rotational angle of the two propellers to determine an optimal relative rotational angle generating minimum vibration and transfer determined optimal relative rotational angle information to a controller; a step (S2) of allowing an encoder attached to each shaft to collect and transfer revolutions per minute (RPM) and rotational angle information of the propeller to the controller; a step (S3) of the controller to calculate the relative rotational angle of the two propeller and compare the relative rotational angle with the optimal relative rotational angle to transfer a control command for matching the relative rotational angle with the optimal relative rotational angle to a propeller phase control system; and a step (S4) of allowing the propeller phase control system to perform control for matching the relative rotational angle with the optimal relative rotational angle in accordance with the control command of the controller.