关键词: 声学, 连续谱, 线谱, 调制包络谱, 螺旋桨空化噪声, 蒙特卡罗算法

Abstract:

In order to solve the problem of modeling and simulation of continuous spectrum of propeller cavitation noise and its modulation spectrum characteristics, four circumstances are categorized to conduct theoretical analysis on synthetic power spectrum of each cavitation bubble noise, and to perform simula- tion tests based on theoretical study and test results on cavitation noise continuous spectrum, randomicity, psuedo - periodicity of collapse of each cavitation bubble, and the waveform of its radiated noise, during which time domain Monte Carlo simulation model is proposed for cavitation noise continuous spectrum. The theoretical analysis and simulation results both show that the frequency domain offset of propeller cav- itation noise modulation characteristics is resulted from instability of cavitation noise continuous spectrum shapes.

Key words: acoustics, continuous spectrum, line spectrum, modulation envelop spectrum, ropeller cav- itation noise, Monte Carlo algorithm