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Sound field separating method

A separation method and sound field technology, applied in the noise field, can solve the problems of poor adaptability, long calculation time, and large amount of calculation.

Inactive Publication Date: 2015-05-06
柳州道缘科技有限公司
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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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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 a multi-spherical virtual source, divide the multi-spherical virtual source into two types of centroidal virtual source strength and non-centroidal spherical virtual source strength, and use the gray value of the sound pressure image as the weighted center of gravity The weight value of the method, using the measured sound pressure value to generate a grayscale image, calculat...

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Abstract

The invention aims at providing a sound field separating method. The method comprises the steps of A, measuring a sound pressure value on a measuring surface; B, generating a gray scale according to the sound pressure value generated by a vibrator, calculating the gray value of each point according to the position of actual sound source points, and then calculating a solid ball virtual source strength ball center coordinate and a non-solid ball virtual source strength ball center coordinate by using the gray value of each point as each weight; C, performing zero filling and expansion for the measured sound pressure value of the measuring surface to obtain the sound pressure value on an expanding surface of the measurement surface; D, building a transmission matrix between the expanding surface of the measurement surface, the sound pressure value of the measuring surface and the multi-virtual-ball equivalent source strength sound pressure to obtain a solving equation of the sound pressure on the measuring surface; E, acquiring the sound pressure values of two sound source surfaces according to the sound pressure resolving equation. With the adoption of the sound filed separating method, the defect that the virtual source strength configuration domain and the measurement surface are conformal in the wave superposition method in the prior art can be overcome; meanwhile, the calculation efficiency and precision are increased.

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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IPC IPC(8): G01H17/00
Inventor 王玉江向宇
Owner 柳州道缘科技有限公司
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