螺旋桨空化噪声连续谱仿真算法

螺旋桨空化噪声连续谱由大量空泡随机崩溃所辐射噪声叠加而成。据此,考虑到空泡初始崩溃时刻的随机性和各空泡辐射噪声频谱的相似性,对四种情况空化辐射噪声连续谱特性分别进行了理论分析表明,可依据空泡半径和初始崩溃时间的统计性质,采用蒙特卡罗方法对空化噪声连续谱波形进行仿真建模,模型参数为空泡半径期望值、差异度和随机度,分别相应于确定辐射噪声的基准波形、各空泡噪声频谱相似程度和大量空泡的随机崩溃过程。该方法输入参数物理意义明确,控制简单,能较好地仿真空化噪声连续谱的特性,仿真结果与理论分析吻合较好。

Simulation algorithm of continuous spectrum of propeller cavitation noise

The continuous spectrum of propeller cavitation noise is due to the collapses of transient cavitation bubbles.On the basis of this viewpoint,the continuous spectrum of propeller cavitation noise for the four cases which are grouped by the randomicity of bubble collapse and the comparability of bubble spectrum are analysed and simulated.The simulatied results are in agreement with the theoretical.This Monte Carlo method is suited to simulate the continuous spectrum of propeller cavitation noise through statistic analysis of the radius and the time of start of collapse of cavitation bubbles.The model’s parameters are the mean radius of the cavities,the variability and randomicity.The physical meanings of these model’s parameters are specific and the use is simple.