Research On Improving The Accuracy Of Noise Field Reconstruction Using Patch Measurement And Wave Superposition Method

In order to control the noise of the underwater vehicle,it is necessary to locate the main noise source at first.The existing patch near-field acoustical holography techniques all have its own shortcomings,so they cannot obtain a good reconstruction accuracy.It is of great practical significance to study the existing patch near-field acoustics holography techniques for improving their reconstruction precision.Firstly,two methods are proposed for improving the reconstruction precision of planar statistically optimal near-field acoustic holography(SONAH)techniques.The correctness and feasibility of the two proposed algorithms in this paper are verified by simulation.Secondly,the wave superposition near field acoustic holography technique is studied,and an improved resolution enhancement method is proposed.The correctness and feasibility of the proposed resolution enhancement method in this paper is verified by simulation.Meanwhile,the reconstructed accuracy of wave superposition near field acoustic holography technique is compared under two different equivalent source configuration schemes.It is shows that the reconstruction accuracy of wave superposition method is greatly affected by the equivalent source configuration.Only by allocating the equivalent source reasonably can a good reconstruction precision be obtained.Thirdly,in order to solve the problem of equivalent source configuration of wave superposition method,this paper adopts a new research idea.The idea used in this paper is to configure the equivalent source on the sound source surface,so it is easy to configure the equivalent sources.However,the source density obtained by the traditional regularization method cannot match the real radiation field very well,resulting in low reconstruction accuracy.Through the intensive study of the compressed sensing algorithm,it is found that the compressed sensing algorithm is very suitable for solving the strong source density.In this paper,the source density obtained by the compressed sensing algorithm is used to reconstruct the sound field by the wave superposition method,then the equivalent source allocation problem of the wave superposition method is solved.The correctness and feasibility of the proposed method in this paper is verified by simulation.