Sound field analysis method based on image recognition positioning and acoustic sensor array measurement

Abstract

The invention discloses a sound field analysis system and a sound field analysis method. The sound field analysis method comprises the following steps of: adjusting position and focal distance of a camera, so that a photographed image comprises an area to be measured, photographing an image as a background image, and saving the background image in an upper computer; fixing three light sources to three angles of an acoustic sensor array, connecting the acoustic sensor array to a data acquisition instrument, and filtering to make colors of the light sources prominent in the image photographed by the camera; fixing the acoustic sensor array nearby the surface of the area to be measured, photographing and recording a position image of the array through the camera, and recording an acoustic signal through the data acquisition instrument; processing the photographed image after measurement is ended, obtaining positions of the light sources in the image, obtaining an area covered by the array, reconstructing a sound field in the area covered by the array by employing a near-field acoustic holography method, acquiring acoustic physical quantity information, superposing a sound field result to an area which corresponds to the image and combining the image and the background image for output according to the position determined by an image recognition result, and acquiring a sound field cloud picture. The sound field analysis method has the advantages of simplicity in measurement and high efficiency.

Description

technical field [0001] The invention relates to the field of noise source location, in particular to a sound field analysis system and method based on image recognition and location and acoustic sensor array measurement. Background technique [0002] In the industrial field, it is often necessary to take noise reduction measures to control noise, but first of all, it is necessary to carry out noise source diagnosis to determine the location and characteristics of each main noise source, which is the premise of noise control. With the development of modern signal processing technology, spectral analysis technology, coherent and partial coherent analysis technology, sound intensity detection technology, beam forming, and near-field acoustic holography technology have been developed rapidly. [0003] Among these methods, near-field acoustic holography can reversely reconstruct the sound field on the surface of the sound source, including sound pressure and normal velocity, as w...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a sound field analysis system based on image recognition and positioning and acoustic sensor array measurement to solve the problems of high acoustic sensor positioning complexity, low work efficiency and high work intensity in the existing near-field acoustic holographic noise source positioning method technical problem

[0008] Another object of the present invention is to provide a sound field analysis method based on image recognition and positioning and acoustic sensor array measurement to solve the existing near-field acoustic holographic noise source positioning method with high complexity of acoustic sensor positioning, low work efficiency and work intensity big technical problem

Images