Method for detecting non-stationary acoustic sources based on near-field acoustical holography technology

A non-stationary sound source and near-field acoustic holography technology, which is applied to the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve problems that have not yet been discovered, and achieve the effect of convenient noise control

Inactive Publication Date: 2014-04-30
GUANGXI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Using near-field acoustic holography to detect non-stationary sound sources, no similar reports have been found

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[0013] Preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0014] A method for detecting non-stationary sound sources based on near-field acoustic holography in the present invention comprises the following steps:

[0015] (1) Based on the acoustic emission phenomenon of non-stationary sound sources and based on the near-field acoustic holography technology of the distributed source boundary point method, an experimental model of cylindrical-spherical non-conformal surface acoustic holography is established;

[0016] (2) On the experimental model, set the number of holographic measurement points and the number of reconstructed spherical nodes for a single sound source, and conduct simulation experiment analysis to select parameters;

[0017] (3) Based on the parameter sele...

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Abstract

The invention discloses a method for detecting non-stationary acoustic sources based on a near-field acoustical holography technology. The method includes the following steps that (1), according to the acoustic emission phenomenon of the non-stationary acoustic sources, a cylindrical surface-spherical surface non-conformal surface acoustical holography experimental model is established according to the near-field acoustical holography technology; (2), the number of detection points and the number of reconstructed spherical surface nodes are set for single acoustic sources on the experimental model, simulation experiment analyzing is performed, and parameters are selected; (3), according to the parameter selection result of single acoustic source simulation, double acoustic sources are reconstructed, and the effectiveness of the method is verified; (4), through analyzing experimental data, the selection rule of the distances from a particular solution point source to the nodes on a reconstructed spherical surface and main parameters affecting reconstruction precision are fictional; (5), according to optimal simulation experiment parameters, an acoustical holography experiment system is designed. The non-stationary acoustic source is positioned through the near-field acoustic holography technology, the position and the characteristics of the non-stationary acoustic source can be accurately measured, and therefore convenience is provided for effective control over noise.

Description

technical field [0001] The invention relates to a method for detecting non-stationary sound sources based on near-field acoustic holography technology. Background technique [0002] From the perspective of environmental protection, all sounds that affect people's normal study, work and rest, and all "unwanted sounds" that people have on certain occasions are collectively referred to as noise. Such as the roar of machines, the sound of motors and whistles of various vehicles, the noise of people and various sudden sounds, etc., are all called noise. In order to effectively control noise, the location and characteristics of the sound source must be accurately judged before noise reduction measures are implemented. No similar reports have been found on the method of detecting non-stationary sound sources using near-field acoustic holography. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the prior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 向宇何伟
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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