多孔弹性介质三层夹心板的隔声性能研究

Sound insulation character of three-layer panels one with elastic porous material

应用Biot关于流体饱和多孔弹性介质的声传播理论,采用传递矩阵的分析方法,就复合多孔弹性材料夹心三层板在不同结构情况下的隔声性能进行了理论研究和实验分析,并与同等条件下双层夹心板的隔声性能进行了比较。数值计算和实验结果均表明,与双层夹心板相比,三层夹心板在中高频段隔声性能有明显优势,但低频段隔声性能有一定程度上的下降。研究还表明不同结构的复合三层夹心板在隔声效果上也各有特色。

The Biot theory of sound propagation in elastic porous medium and the method of transfer matrix are used to analyze the transmission loss of three layer panels with elastic porous material. Comparison of sound insulation character between double panels and three layer panels is also given. Both numerical simulation and experiment results show that the three layer panels compared with double panels have advantage in sound insulation in mid to high frequency range, but have disadvantage in low frequency range. The study also shows that different structures of three layer panels have different characters in sound insulation.