空化噪声谱特性研究

空化发生时，气泡经历成长、溃灭、反弹、再溃灭等复杂过程，辐射出尖的声压脉冲，对空泡辐射的噪声特性起主导作用。空泡一次溃灭辐射的脉冲可以用单指数函数或双指数函数来描述，空泡多次溃灭辐射的脉冲可以用振幅衰减的指数函数序列来描述，本文对这些指数模型进行了详细的分析，得到不同模型对应的噪声谱。指出了这些模型的适用范围。并对经典单空泡噪声谱的特征进行了解释和说明。本文还利用多次脉冲对应的噪声谱解释了实验得到的噪声谱在中间的频率范围内的起伏现象

AN INVESTIGATION ON THE SPECTRA OF BUBBLE NOISE

When cavitation occurs, the bubble undergoes complicated procedure of growth, collapse, rebound and re collapse. During the procedure, the bubble radiates a sharp pulse, which can be described by single or double exponential functions and will dominate the bubble noise. The function models, which are suitable for different cases are presented and the noise spectra are obtained accordingly. By the model the character of classical spectra of single bubble can be explained. Moreover, a lot of kinds of exponential functions are tried, in the paper, to form the model and to explain the wave phenomena of noise spectra, which were got in experiment.