Point acoustic source identification method without phase information

An identification method and technology of phase information, applied in positioning, radio wave measurement system, measurement of ultrasonic/sonic/infrasonic waves, etc., to achieve the effects of easy implementation, reduced requirements, and high recognition accuracy

Inactive Publication Date: 2013-02-27
JIANGSU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art and propose a point sound source identification method that does not need phase

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  • Point acoustic source identification method without phase information
  • Point acoustic source identification method without phase information
  • Point acoustic source identification method without phase information

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Embodiment

[0065] Suppose there is a point sound source on the sound source surface, the frequency of the point source is 1200Hz, and the sound source intensity is , the point source is located at (0.12m, -0.18m). at the distance from the sound source The microphone array is arranged at the point, and the sound pressure signal radiated by the point sound source is collected. The distance between the microphones is 0.1m, and the number of the microphone array is . Fourier transform is performed on the time-domain sound pressure signal measured by the microphone, and the sound pressure amplitude is obtained after spectrum analysis (the phase information of the sound pressure is not required), according to the formula (10) ,in , to obtain the sound pressure magnitude vector of the measurement array. By formula (12) ,in , to construct the sound pressure amplitude vector of a point source on the sound source surface radiating to the measurement surface. right normalized to obt...

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Abstract

The invention discloses a point acoustic source identification method without phase information, which comprises the following steps: measuring acoustic pressure radiated from a point acoustic source s at (xs,ys) on an acoustic source plane to a microphone array plane by a microphone array to obtain an acoustic pressure amplitude vector Ps; constructing an acoustic pressure amplitude vector Ps' formed on a measurement plane by a point acoustic source s' at any position on the acoustic source plane to obtain a normalization vector e=Ps'/||Ps'||; and performing inner product computation on the vector Ps and the normalization vector e: ||||=||Ps||*||e||, ||Ps||*||e||=||Ps||, ||Ps||=||||max, wherein when the maximum value ||||max is obtained, the position of a corresponding point acoustic source s' in the normalization vector e is that of the point acoustic source s on the acoustic source plane, and the strength of the acoustic source A=||||max/||Ps'|| is obtained. Therefore, the point acoustic source can be identified precisely only by measuring the acoustic pressure amplitude value.

Description

technical field [0001] The invention relates to the field of sound source identification based on a microphone array, and is a sound source identification method based on the mathematical theorem of Cauchy-Schwartz inequality without measuring sound pressure phase signals. Background technique [0002] Sound source identification is one of the important contents of noise control engineering, and it is of great significance in low-noise design of products and acoustic fault diagnosis. Obtaining information such as the position and intensity of the sound source through sound source identification, and reducing noise from the sound source link is the most effective noise control method; obtaining information about the operation of mechanical equipment by analyzing sound signals can detect faults in time to avoid losses. [0003] Traditional noise measurement methods such as coverage method, separate operation method, and sound intensity method all have certain limitations, and ...

Claims

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Application Information

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IPC IPC(8): G01S5/18G01H17/00
Inventor 赵晓丹孙少林
Owner JIANGSU UNIV
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