Sound field reconstruction system and method based on sound pressure and particle vibration velocity

Abstract

The invention discloses a sound field reconstruction system and method based on sound pressure and particle vibration velocity, and the system comprises a multi-sensor scanning module which is used for carrying out the scanning through an array composed of sound vector sensors, and obtaining the sound pressure and particle vibration velocity data of a measurement surface; a multi-channel real-time data acquisition module, used for performing multi-channel real-time acquisition on sound pressure and particle vibration velocity data based on labview; a filtering module, used for filtering data points of which the amplitudes are smaller than a preset value on the measuring surface by using the amplitude filtering coefficient of the sound field measuring surface; and a sound field reconstruction module, used for performing sound field reconstruction by using a near-field acoustical holography method based on an equivalent source method, including sound field reconstruction of sound pressure, sound field reconstruction of mass point vibration velocity and sound field reconstruction of a sound intensity field. The mass point vibration velocity is introduced on the basis of the original equivalent source method near-field acoustical holography based on sound pressure to reconstruct the sound field, so that the sound field reconstruction precision and the sound source positioning precision are effectively improved.

Description

technical field [0001] The invention relates to the technical field of sound field reconstruction, in particular to a sound field reconstruction system and method based on sound pressure and particle velocity. Background technique [0002] Existing noise monitoring often relies on measuring instruments such as sound level meters and frequency analyzers. The results obtained only contain a certain aspect of the acoustic information, and a large amount of noise information cannot be effectively obtained. Acoustic imaging technology can know the distribution of the sound field in a certain space, locate the noise source accurately and intuitively, and monitor the operation of corresponding equipment and systems. [0003] Existing acoustic imaging technologies are mainly realized through near field acoustic holography (near field acoustical holography, NAH). NAH technology requires that the distance between the holographic measurement surface and the sound source surface be a f...

AI Technical Summary

Problems solved by technology

Especially with the improvement of the method and the requirements of actual engineering, the sound field reconstruction method based only on sound pressure can no longer meet people's demand for reconstruction accuracy.

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