An approximate prediction method of transient noise based on impulse response
In order to improve the computational efficiency and accuracy of transient noise of underwater structures,an approximate prediction method for transient noise based on impulse response is proposed.This method is applicable to the prediction of transient radiated noise when the normal vibration velocity of a rigid structure surface is known.The impulse response of each element of the structure surface is obtained by solving a pulse point source scattering problem that is recip-rocal to the radiation problem using a fast time domain algorithm,and then convolves each impulse response with the corres-ponding normal vibration velocity signal at that location.Finally,the transient noise field is calculated by weighted summa-tion of the convolution results using the unit area as a weight.Using two typical analytical models,the correctness of the method is verified by comparing it with the time domain analytical solution.For a tube array structure embedded in a circu-lar baffle,the approximate prediction method is used to calculate the transient radiated noise under a certain normal vibra-tion velocity boundary condition.Considering the geometric structure of the model,the temporal characteristics of the radi-ated noise signal and the spatial directionality of the acoustic energy at the investigated field point are analyzed.
transient noiseimpulse responsereciprocityfast time domain algorithmconvolution
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