Abstract: According to Model Voronina, this paper introduced the structure factor of activated carbon fiber materials and established theoretical model of sound absorbing of activated carbon fiber materials via method of acoustic impedance transfer. The acoustic analyzer of dual channel impedance tube was used to test the sound absorbing coefficient within an acoustic range of 250 ~ 3 200 Hz frequencies, and the test results were compared with theoretical results for analysis. Results indicated that the test results and the theoretical results were basically similar, verified the feasibility of establishing a sound absorption model for activated carbon fiber materials and provided theoretical guidance for the design and development of activated sound absorption materials.

Key words: activated carbon fiber; characteristic impedance; propagation constant; sound absorbing coefficient; structural characteristics