Abstract:
The BEM-based acoustic holography is applied to predicting vibroacoustic parameters on the boundary enclosing the interior space. The singular value decomposition method is utilized for inverse operation of the transfer matrix. Such backward reconstruction usually suffers from the divergence phenomenon due to the inversion of ill-conditioned matrix produced by nonradiating wave components involved with extremely small measurement errors. In order to minimize the reconstruction error arising from the divergence phenomenon, optimal measurement positions are determined by the effective independence method. In addition, regularization methods are used to enhance the resolution of reconstructed field by suppressing the nonradiating wave components. The interior field of a rectangular box is considered as an example for validating and demonstrating the proposed reconstruction process and the experimental verification is carried out. It is noted that the present method can effectively improve the resolution of the reconstructed field, thus vibroacoustic parameters on the vibrating boundary can be estimated with reasonably good precision.