Sound Insulation Characteristics of Panels Lined with Porous Material

Abstract

The approach for the sound insulation of panel lined with porous materials has been developed. Biot theory is adopted for the analysis of the waves propagated in porous material. The transfer matrix between the contact interfaces and also between the two ends of the porous material and of the solid material has been established. The combination of these matrices can be conducted on evaluating the sound propagation characteristic in the layered media. The comparison of the transmission loss with the experimental measurements and results of the literature shows that the present method is reliable. The analysis of the double panels and sandwich panel reveals that the unbonded connection of the layer medium has better sound insulation ability in higher frequency range and just a little reduction in low frequency region. For double panels and sandwich panel, either bonded or unbonded, the increasing of the thickness of the porous material can improve the overall sound transmission loss is definite even though it is not so obvious in bonded case.