On the use of processing vibrating velocity in wavenumber domain for computation of sound radiation of a planar plate

摘要

Sound radiation from planar radiators can be computed by processing the vibrating velocity in wavenumber domain. As Fourier transform is applied to a finite aperature, wavenumber processing is often accompanied with distortions, resulting errors in calculations. The objective of this paper is to show some techniques to solve the problems encountered in wavenumber processing. Two modified Green function in k-space are given and compared. Sound radiation fields parallel and perpendicular to the plate plane can respectively be obtained from normal velocity measured with a scanning laser vibrometer by k-space signal processing and forward sound field propagation. Investigations show that wavenumber-processing technique is of efficiency in the calculation of sound radiation from vibrating velocity.