RECONSTRUCTION OF PARTICLE VELOCITY FIELD AND SOUND PRESSURE FIELD ON THE SOURCE SURFACE BY JOINTLY UTILIZING PARTIAL SOUND PRESSURE AND NORMAL VELOCITY

摘要

In order to reduce the number of velocity measurement points, a method of jointly utilizing sound pressure and normal velocity is proposed in this paper to reconstruct particle velocity field and sound pressure field on the source surface. Firstly, a novel form of pressure acoustic radiation modes is derived, which are corresponding with the complex velocity acoustic radiation modes. On this basis, partial sound pressures and normal velocities can be jointly utilized to reconstruct the particle velocity field and the sound pressure field. Finally, numerical simulation on a simple supported plate and experimental verification on a clamped plate are carried out. The results show that the reconstruction can be realized by jointly utilizing partial sound pressures and normal velocities. So we can reduce the number of velocity measurement points by replacing them with sound pressure measurement points. The proposed method is helpful for engineering application of acoustic source identification and acoustic field prediction using partial measurements on the surface of acoustic source.