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Method for re-establishing moving sound source by adopting moving equivalent source method

A technology for moving sound sources and equivalent sources, which is applied in the field of noise and can solve problems such as sound source shape restrictions

Inactive Publication Date: 2010-09-01
HEFEI UNIV OF TECH
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  • Description
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Problems solved by technology

However, this method has its inherent defects, and it has limitations on the shape of the sound source, that is, it can only be used for the reconstruction of planar moving sound sources

Method used

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  • Method for re-establishing moving sound source by adopting moving equivalent source method
  • Method for re-establishing moving sound source by adopting moving equivalent source method
  • Method for re-establishing moving sound source by adopting moving equivalent source method

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Embodiment Construction

[0079] In this embodiment, the method for reconstructing a moving sound source using the moving equivalent source method is carried out as follows:

[0080] 1. See Figure 1a and Figure 1b , using a microphone array to measure sound pressure information containing the Doppler effect on the measurement surface H;

[0081] 2. See Figure 1a and Figure 1b , set the virtual source surface S inside the moving sound source * , and there are moving equivalent sources distributed on the virtual source surface, and the number of moving equivalent sources is not greater than the number of network points on the corresponding measurement surface; the moving equivalent source is a moving monopole sound source, and its frequency-domain radiation sound pressure expression is

[0082] g ‾ ( r , r oj ) = exp [ ...

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Abstract

A method for re-establishing a moving sound source by adopting a moving equivalent source method is characterized in that the method comprises the following steps of measuring Doppler effect-contained sound pressure data in a moving sound source radiation sound field; establishing a transmission relationship between vibration speed and radiation sound pressure under Doppler effect-contained measured sound pressure and sound source static situation by the moving equivalent source; removing the influence of the Doppler effect according to the transmission relationship; and realizing the positioning identification and sound field re-establishment of the moving sound source. The moving sound source applicable to the method can be any shapes including plane, cylindrical surface or spherical surface; and the method is developed on the basis of a near-field acoustical holography reconstruction algorithm based on the equivalent source, has good computation stability, high computation precision and simple execution.

Description

technical field [0001] The invention relates to a sound field reconstruction and visualization method in the field of noise in physics specialty, which is used for identification and positioning of mobile sound sources and reconstruction of radiation sound fields of mobile sound sources. Background technique [0002] Near-field acoustic holography is a powerful sound source identification and sound field visualization tool. After years of research, the spatial Fourier transform method and statistical optimal algorithm for separable coordinates such as plane, cylinder and sphere have been developed; and It is suitable for various near-field acoustic holography algorithms such as boundary element method and equivalent source method for sound sources of arbitrary shape. But all these near-field acoustic holography techniques are used for the steady-state sound field where the sound source is still, and are not suitable for the reconstruction of the sound field of the moving sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 张永斌毕传兴徐亮陈心昭
Owner HEFEI UNIV OF TECH
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