Pulsating pressure applying method in ship total vibration forecast

The invention discloses a pulsating pressure applying method in ship total vibration forecast. The method comprises the following steps: acquiring the total pulsating pressure P of different measuring points, the pulsating pressure P1 of a non-cavitation propeller, the value of a phase angle theta when the total pulsating pressure P occurs, and the value of a phase angle theta 1 when the pulsating pressure P1 of the non-cavitation propeller occurs from a ship cavitation test report; calculating pulsating pressure P2 of the cavitation propeller at different measuring points and a phase angle theta 2 when the pulsating pressure P2 of the cavitation propeller occurs; the pulsating pressure P1r of the non-cavitation propeller when the rotating speed of the propeller is r and the pulsating pressure P2r of the cavitation propeller when the rotating speed of the propeller is r are calculated; and the values of P1r and P2r obtained in the step 3 are applied to the surface of the ship body, and application of the puls