Study on acoustic characteristic parameters of activated carbon fiber materials

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.