A Sound Field Separation Method Based on Helmholtz Equation Least Square Method

Abstract

The object of the present invention is to provide a sound field separation method based on the Helmholtz equation least squares method, comprising the steps of: obtaining the sound pressure on the measurement surface; resampling the sound pressure on the measurement surface to obtain different measurement point groups; The sound pressure generated by sound source A and sound source B at each measuring point is decomposed according to the sound pressure expansion formula in the HELS acoustic holography method, and the transfer relationship between the sound pressures of the two sound sources on the measurement surface is established; The transfer matrix between the sound source surfaces; Singular value decomposition is performed on the transfer matrix to obtain the sound pressure generated by the sound source A alone on the measurement surface or at any position to achieve sound field separation. The invention adopts a single measurement surface and the HELS method to separate and reconstruct the sound field, only needs to collect the sound pressure data of a single measurement surface, reduces the collection workload and collection cost, requires few measurement points, high calculation efficiency, and simple implementation.

Description

technical field [0001] The invention relates to a noise control method, in particular to a sound field separation method. Background technique [0002] In actual engineering measurement, there are often interference sources near the object to be measured. In order to analyze the radiation characteristics of the target sound source, it is necessary to separate the sound field. The existing sound field separation methods are divided into the following categories according to the measurement methods: (1) separation based on double-layer sound pressure measurement surfaces; (2) separation based on double-layer particle velocity measurement surfaces; (3) separation based on single-layer sound pressure- Particle velocity measurement surface separation. It can be seen from the above three methods that all the existing methods use the composite measurement value as the input value of the sound field separation method, that is, to obtain one kind of physical information on two measu...

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Problems solved by technology

As can be seen from the above three methods, the existing methods all use the composite measurement value as the input value of the sound field separation method, that is, to obtain one kind of physical information on two measurement surfaces or to obtain two kinds of information on one measurement surface, and the required information is much , the acquisition cost is high, and the implementation process is complicated

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