活性炭纤维材料吸声性能预测模型

Predicting model of sound absorbing properties of activated carbon fiber materials

为建立活性炭纤维材料吸声性能预测模型,利用阻抗管对不同规格的粘胶基活性炭纤维材料在250～1 600 Hz中低频率声波范围内的吸声性能进行测试,根据Delany和Bazley提出的特性阻抗率和传播常数理论模型,采用最小二乘法建立了活性炭纤维材料声学特征参数特性阻抗率和传播常数预测模型。在此基础上,建立了活性炭纤维材料吸声系数模型,并对该模型计算结果和试验结果进行了比较。结果表明,二者结果基本相一致,验证了建立的活性炭纤维材料吸声性能预测模型具有一定的可信度,可为开发和设计活性炭纤维吸声材料提供理论参考。

This paper is intended to establish a predicting model for detecting sound absorbing properties of activated carbon fiber materials. The sound absorbing properties of viscose-based activated carbon fibers with different specifications were tested using an impedance tube in the 250 - 1 600 Hz middle and low frequencies acoustic range. Based on the theoretic models of inherent impedance and propagation constant proposed by Delany and Bazley, the predicting model of acoustic inherent impedance and propagation constant of activated carbon fibers is established by employing the least square method. Moreover, the model of sound absorbing coefficient of activated carbon fibers is developed. The comparison of the computed values using the model with the experimental ones showed basically consistent, indicating the model has certain degree of confidence and provides a theoretical basis for the development and design of sound absorbing materials of activated carbon fibers.