Partial field decomposition method based on particle vibration velocity

Abstract

The invention discloses a partial field decomposition method based on particle vibration velocity. The method comprises the steps that a number of particle vibration velocity sensors corresponding to a number of incompatible sound sources are set; a number of particle vibration velocity signals are acquired; a number of measurement field points are set; each particle vibration velocity signal and each field point sound pressure signal are sampled and arranged in an orderly manner; an initial conditional spectrum and an iterative conditional spectrum are calculated; a conditional auto-spectrum and a conditional cross-spectrum are calculated, and a partial coherence function is acquired; the partial field sound pressure is calculated; particle vibration velocity signals and field point sound pressure signals are rearranged in an orderly manner; and the sound pressure of the partial field of any particle vibration velocity signal at any measurement field point is repeatedly measured. According to the invention, the particle vibration velocity signals measured by the particle vibration velocity sensors are used as reference; due to fast attenuation of the particle vibration velocity, the method can better sense and distinguish different potential sound sources, and then provides the decomposition accuracy of the partial field; the particle vibration velocity is directly measured to avoid extra calculation; and the method is conducive to improving the convenience and the accuracy for acquiring the particle vibration velocity.

Description

technical field [0001] The invention relates to the decomposition technology of incompletely coherent sound field, in particular to a partial field decomposition method based on particle vibration velocity. Background technique [0002] Near-field acoustic holography is a very effective technique for noise source identification and sound field visualization, but it is only applicable to fully coherent sound fields. However, in actual engineering, the sound field to be studied is often an incompletely coherent sound field, and it is usually necessary to decompose the incompletely coherent sound field into several independent partial fields with the help of multi-reference source cross-spectrum measurement method, so that each partial field is a fully coherent sound field , so that each partial field is studied separately by near-field acoustic holography. [0003] At present, there have been many literatures on partial field decomposition methods, and different algorithms ha...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a partial field decomposition method based on particle vibration velocity, and solve the technical problems of low decomposition accuracy and high decomposition cost of the partial field decomposition method based on sound pressure signals in the prior art

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