Wave superposition based sound field reconstruction

Abstract

In order to overcome the obstacle of singular integral in boundary element method (BEM), we presented an efficient sound field reconstruction technique based on the wave superposition method (WSM). Its principle includes three steps: first, the sound pressure field of an arbitrary shaped radiator is measured with a microphone array; then, the exterior sound field of the radiator is computed backward and forward using the WSM; at last, the final results are visualized in terms of sound pressure contours or animations. With these visualized contours or animations, noise sources can be easily located and quantified; also noise transmission path can be found out. By numerical simulation and experimental results, we proved that the technique are suitable and accurate for sound field reconstruction. In addition, we presented a sound field reconstruction system prototype on the basis of this technique. It makes a foundation for the application of wave superposition in the sound field reconstruction in industry situations.