Near-field acoustical holography reconstruction method based on Fourier transformation and source strength simulation technology

Abstract

The invention provides a near-field acoustical holography reconstruction method based on the Fourier transformation and source strength simulation technology. The near-field acoustical holography reconstruction method based on the Fourier transformation and source strength simulation technology comprises the steps that continuous simple sources are arranged on a rectangular virtual source surface, and a source strength function is a three-dimensional free space Green function; double Fourier series expansion is carried out on an unknown source strength density function, and a sound pressure expression is deduced; expressions of the sound pressure on measuring points on a holographic surface are deduced through quick Fourier transformation and inverse transformation calculation, and a non-homogeneous linear equation set which uses a Fourier series expansion coefficient as an unknown term and the sound pressure as a constant term is formed through arrangement; the Fourier series expansion coefficient is obtained by solving the non-homogeneous linear equation set through a generalized inverse matrix, the Fourier series expansion coefficient is substituted into a reconstruction formula in a back substitution mode, the expression of the sound pressure on any field point in a radiation field is obtained, and reconstruction and prediction of the whole space sound field are achieved. According to the near-field acoustical holography reconstruction method based on the Fourier transformation and source strength simulation technology, implementation is easy, the calculating speed is high, limitation cannot be caused by the limited hole diameter, and the near-field acoustical holography reconstruction method is applicable to sound sources with any shapes.

Description

technical field [0001] The invention relates to a near-field acoustic holographic reconstruction method based on Fourier transform-source intensity simulation technology, and belongs to the technical field of acoustic holography. Background technique [0002] Near-field acoustic holography was proposed in the mid-1980s, and it is mainly used in the identification of noise sources and the visualization of noise. Its basic principle is to record holographic data on the measurement surface close to the surface of the measured sound source object, and then reconstruct the three-dimensional spatial sound field through the spatial sound field transformation algorithm. However, the current near-field acoustic holographic reconstruction technology has the disadvantages of complex implementation process and slow speed, and it cannot be reconstructed for some special-shaped sound sources. Contents of the invention [0003] The technical problem to be solved by the present invention...

AI Technical Summary

Problems solved by technology

However, the defects of the current near-field acoustic holographic reconstruction technology are that the realization process is complicated and the speed is slow, and the reconstruction cannot be realized for some special-shaped sound sources.