Simulation Algorithm of Naval Vessel Radiation Noise

Abstract

Propeller cavitation noise continuous spectrum results from noise radiated from random collapses of a large number of cavitation bubbles. In consideration of randomicity of initial collapse of cavitation bubbles and similarity of frequency spectrums of various cavitation bubble radiated noises, theoretical analysis is conducted on four types of cavitation radiated noise continuous spectrum characteristics, which shows that simulation modeling could be carried out for cavitation noise continuous spectrum waveform by use of Monte Carlo method based on statistics of cavitation bubble radius and initial collapse time. The model parameters are expected values, difference degree and randomicity of cavitation bubble radius, which will be respectively used to determine base waveform of radiated noise, similarity of various cavitation bubble noise frequency spectrums and random collapse process of a larger number of cavitation bubbles. The input parameters have specific physical meaning and are controlled simply and could simulate the characteristics of cavitation noise continuous spectrum in a better way and therefore the simulation results could be better matching with theoretical analysis.