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Sound Field Separation Method

A separation method and sound field technology, applied in the field of noise, can solve problems such as long calculation time, low efficiency, and large amount of calculation

Inactive Publication Date: 2018-03-27
柳州道缘科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The wave superposition method must require that the configuration domain of the virtual source intensity is conformal to the measurement surface;
[0006] (2) Large amount of calculation, low efficiency, long calculation time, and poor adaptability

Method used

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Experimental program
Comparison scheme
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Embodiment 1

[0077] Such as figure 1 As shown, the sound field separation method of this embodiment includes the following steps:

[0078] A. A measurement surface is set between the two sound source surfaces in the measurement sound field, and the sound pressure and vibration velocity sensor is arranged in a grid on the measurement surface. The distance between adjacent grid points is less than half a wavelength, and the sound pressure and vibration velocity sensor Measure the sound pressure value on the measuring surface;

[0079] B. Carry out finite element simulation on the shape of the vibrating body, establish the equivalent source strength of multiple virtual spheres, and divide the equivalent source strength of multiple virtual spheres into two types: the virtual source strength of the centroid sphere and the virtual source strength of the non-centroid sphere, and the sound pressure image The gray value is used as the weight value of the weighted center of gravity method, and the ...

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Abstract

The present invention aims to provide a sound field separation method, which includes the following steps: A, measuring the sound pressure value on the measuring surface B, generating a gray scale image according to the sound pressure value generated by the vibrating body, and calculating each Point gray value, then use each point gray value as respective weight to calculate centroid sphere virtual source strong sphere coordinates and non-centroid sphere virtual source strong sphere coordinates; C, measure the sound pressure value on the measurement surface Zero padding and extension to obtain the sound pressure value on the extended surface of the measurement surface; D. Establish the transfer matrix between the extended surface of the measurement surface, the sound pressure value on the measurement surface and the sound pressure of the equivalent source intensity of multiple virtual spheres to obtain the sound pressure on the measurement surface Sound pressure solution equation; E, combined, sound pressure solution equation, to obtain the sound pressure values ​​of the two sound source surfaces. The sound field separation method overcomes the defect that the wave superposition method in the prior art must require the configuration domain of the virtual source intensity to be conformal to the measurement surface, and also has high calculation efficiency and calculation accuracy.

Description

technical field [0001] The invention relates to the field of noise, in particular to a sound field separation method. Background technique [0002] In actual measurement, it is usually encountered that there are sound sources on both sides of the measurement surface, or there is reflection or scattering on one side of the measurement surface. The sound field produced by these interfering sound sources affects the accurate measurement of the sound field radiated by the target sound source. In actual engineering, in order to more accurately study the sound radiation characteristics of the target sound source or the reflection characteristics of the reflective surface, it is necessary to separate the radiated sound from both sides of the measurement surface. [0003] Existing separation methods include: (1) Single-sided sound field separation technology based on Fourier transform ("Acta Physica Journal" (2009, Vol. 58, No. 12)). This method can remove the singularity, and can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 王玉江向宇
Owner 柳州道缘科技有限公司