Sound field reconstruction of an underwater rectangular plate based on the element radiation superposition method
Due to the problems of the equivalent source method(ESM)in sound field reconstruction of underwater structural sound sources—it is difficult to determine the configuration position of the virtual equivalent source,and the transfer matrix is too ill-conditioned in the process of inversion—a sound field reconstruction method of an un-derwater structure sound source is presented based on the element radiation superposition method(ERSM).Here-in,the vibration and acoustic transfer model is established between the surface vibration of the sound source and the radiation acoustic field,deriving a vibroacoustic transfer function,which can be calculated rapidly.This function is used as a transfer operator for the reconstruction of the acoustic field.Numerical simulations for an underwater rec-tangular plate were performed to demonstrate the advantages of the proposed method.Results validate that ERSM displays higher accuracy of reconstruction and larger valid hologram distance than ESM.Moreover,the simulation results with different numbers of array elements and signal-noise ratios further verify that the proposed method can improve the reconstruction accuracy of the acoustic fields of underwater structures.
element radiation superposition methodsound field reconstructionstructural sound sourcenear-field a-coustic holographyvibroacoustic transfer functioninverse problemill-posedness of the matrixparametric analysis
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