Sound field rebuilding method

Abstract

The invention aims at providing a sound field rebuilding method. The sound field rebuilding method comprises the following steps that firstly, a sound pressure value of a measuring face in a measuring sound field is measured; secondly, different sound sources are endowed with a certain weight through the centroid method according to the actual positions of the sound sources and the sound intensity, the positions and number of multi-ball virtual source intensities and the position coordinates of each virtual ball are calculated; thirdly, zero filling expanding is carried out on the measured sound pressure value of the measuring face to obtain the sound pressure value of an expanding face of the measuring face; fourthly, a transfer matrix between the sound pressure value of the expanding face of the measuring face and the virtual ball sound pressure is calculated; fifthly, a transfer matrix between the sound pressure value of a rebuilding face and the sound pressure value of the multi-ball virtual equivalent source intensities is built; sixthly, the transfer matrix obtained in the fourth step and the transfer matrix obtained in the fifth step are combined, and the sound pressure value of the rebuilding face is obtained. According to the sound field rebuilding method, multi-ball region two-dimensional fast Fourier conversion algorithm is introduced, a virtual source intensities configuration and the measuring face do not need to be conformal, and the calculation efficiency and calculation precision are very high.

Description

technical field [0001] The invention relates to the field of noise source identification methods, in particular to a patch NAH sound field reconstruction method based on sound pressure measurement and multiple virtual spheres. Background technique [0002] Patch near-field acoustic holography (Patch near-field acoustic holography, PNAH) is a new type of near-field acoustic holography developed on the basis of near-field acoustic holography theory. PNAH allows the measurement surface to be smaller than the actual source surface, and the reconstruction area can be a local source surface, which breaks through the limitation of conventional NAH on the holographic aperture size, and is more convenient for the practical application of NAH. [0003] Existing local near-field acoustic holography techniques include: (1) Data extrapolation method. Yoshikawa studied the data extrapolation technology in the article "Acoustic Society of America" ​​(2001, Volume 110, Issue 4), and propos...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a sound field reconstruction method, which overcomes the defect that the distribution domain of the virtual source intensity needs to be conformal to the measurement surface in the prior art, and the calculation efficiency and accuracy are low. Algorithm, does not require virtual source intensity configuration domain to be conformal to the measurement surface, has high calculation efficiency and calculation accuracy

Images