金属橡胶材料单层结构吸声特性研究

从理论上研究了金属橡胶材料单层结构吸声特性。根据金属橡胶材料声学特性参数计算式，推导出两种基本单层吸声结构——置于刚性墙和带有空气层吸声结构的声阻抗率和吸声系数计算式。确定了流阻率是决定金属橡胶材料声学特性的基本参数。分析了材料厚度、流阻率及空气层厚度对两种吸声结构的吸声性能影响关系，建立了金属橡胶材料单层吸声结构第一共振频率的计算方法。结果表明：通过优化设计材料厚度、流阻率及空气层厚度可有效提高金属橡胶材料单层吸声结构的吸声性能。

Study on the Sound Absorption Performance of Single Layer Structure Metal Rubber Material

The sound absorption performance of single layer metal rubber (MR) material was theoretically investigated. The formulae were deduced to calculate the acoustic impedance rate and sound absorption coefficient for two kinds of basic single-layer absorption structure in rigid wall and with air layer. The flow resistivity is the main parameter to determine the sound absorption performance of MR material. The influence of the thickness of MR layer, flow resistivity and thickness of the air layer on the sound absorption performance of the two kinds of structures was analyzed. The method for calculating first resonant frequency for single layer structure MR material was presented. The results indicate that the optimization of thickness of MR material, flow resistivity and the thickness of the air layer is helpful to improve the sound absorption performance of the single layer structure MR material.