Point acoustic source identification method without phase information

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 ...

AI Technical Summary

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 information. It only needs to measure the amplitude information of sound pressure, and there is no phase matching problem between the microphones. Accurate identification of point sound sources

Images