多孔橡胶板声辐射效率数值研究分析

Numerical Study on Sound Radiation Efficiency of Porous Rubber Plate

多孔橡胶板具有优良的隔声吸声性能,是减振和降噪的首选材料,而声辐射效率是描述其声辐射能力的一个重要参数。为了深入分析多孔橡胶板的声辐射性能,建立了可以表征多孔橡胶板特性的描述性模型,采用混合FE-SEA方法对尺寸为500 mm×500 mm×30 mm的多孔橡胶板声辐射效率进行了数值计算分析,研究了多孔橡胶板结构参数(开孔率、孔径宏观参数)和材料特性(杨氏模量、橡胶密度)对声辐射效率的影响规律。结果表明,不同参数在不同频段对声辐射效率的影响特性不同,对不同工况下多孔橡胶板参数优化具有一定理论指导意义。

Porous rubber plate is a material with excellent acoustic absorption performance, which is naturally good for damping structural vibration ,and sound radiation efficiency is an important parameter to describe its sound radiation performance. The ob- jectives of this study are to analyze sound radiation performance of porous rubber plate and examine the impacts while varying structural dimensions such as porosity ,viscous characteristic length and thermal characteristic length ,as well as material properties such as Young~ modulus and rubber density. The porous rubber plate, size 500 mm x500 nun x30 mm, is analyzed using hybrid FE-SEA method. The numerical results show that different parameters in different frequency bands have different effect on sound radiation efficiency,which might provide some useful reference to parameter optimization of porous rubber plate.