活性炭纤维材料声学特性参数研究

Study on acoustic characteristic parameters of activated carbon fiber materials

为分析活性炭纤维材料2个最基本的声学特性参数：传播常数和特性阻抗，根据声波在活性炭纤维材料中传播的基本理论，通过运动方程和连续性方程，建立了传播常数和特性阻抗理论模型；利用阻抗管测试活性炭纤维材料在250～2500Hz频率声波范围内表面阻抗，采用2倍厚度法确定活性炭纤维材料传播常数和特性阻抗，并对2个声学特性参数的理论和试验结果进行对比分析。结果表明，声学特性参数理论模型具有可行性，可为开发和设计活性炭纤维吸声材料提供理论参考。

In order to analyze two basic acoustic characteristic parameters of activated carbon fiber materials ： propagation constant and characteristic impedance, a theoretical model of propagation constant and characteristic impedance is established based on the propagation theory of acoustic waves in activated carbon fiber materials and equations of motion and continuity. The surface acoustic impedance is tested with an impedance tube of the activated carbon fiber materials in the range of 250 - 2 500 Hz frequencies acoustic wave, and then the propagation constant and characteristic impedance of the activated carbon fiber materials are determined by the method of double thickness. The theoretic values of two acoustic characteristic parameters are compared with those of the experimental results, it is found that the theoretical model has good feasibility and can provide reference for developing and designing the activated carbon fiber materials with acoustic characteristics.