High-precision near-field acoustic holography algorithm adopting weighted iteration equivalent source method

Abstract

The invention discloses a high-precision near-field acoustic holography algorithm adopting a weighted iteration equivalent source method, which is characterized in that a holographic plane H is arranged in a sound source near-field radiation area, and sound pressure PH on the holographic plane H is measured; an equivalent source plane Se is arranged at the side, which is away from the holographic plane H, of an object reconstruction plane T, and equivalent sources are arranged on the equivalent source plane Se; a relation between the sound pressure PH and each equivalent source is established by using a sound pressure transfer matrix between the equivalent source and the holographic plane H; and the source intensity Q of each equivalent source is solved by adopting a new iterative regularization algorithm with a posteriori weighted norm constraint penalty term, and then sound field data on the object reconstruction plane T is calculated by using the solved source intensity Q and the transfer matrix between the equivalent source and the object reconstruction plane T. According to the invention, the source intensity of each equivalent source is precisely solved by using the new iterative regularization algorithm with the posteriori weighted norm constraint penalty term, thereby avoiding source intensity energy leakage caused by a 2-norm penalty term in the Tikhonov regularization process. Compared with conventional equivalent source based near-field acoustic holography, a calculation result acquired by the method disclosed by the invention is more accurate.

Description

technical field [0001] The invention relates to a high-precision, high-resolution near-field acoustic holographic algorithm in the field of noise source identification and analysis. Background technique [0002] Near-field acoustic holography is a cutting-edge acoustic technology with powerful noise source identification, location and sound field visualization functions. It has broad application prospects in mechanical fault diagnosis and noise control engineering. After years of research, the spatial Fourier transform method and statistical optimal algorithm for separable coordinate surfaces such as planes, cylinders, and spheres have been developed, as well as the boundary element method and equivalent source method (also known as the equivalent source method) for sound sources of arbitrary shapes. Known as the wave superposition method) and other near-field acoustic holography algorithms. Among them, the equivalent source method has greater potential in engineering appli...

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Problems solved by technology

This often leads to the leakage of equivalent source intensity energy, reduces the peak value of source intensity, and causes the loss of resolution and calculation accuracy of near-field acoustic holography calculation results.

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