Authors: Xin an Zhang
Addresses: 134#, Xi'an Polytechnic University, 19 South Jinhua Road, Xi'an, 710048, PR China; Institute of Acoustics, Tongji University, Shanghai 200092, PR China
Abstract: Because of the complexity of classical sound absorption theory|s expressions, it is difficult to obtain physical insight into the acoustic behaviour of porous materials and to determine the dominant mechanism for sound absorption for a given material at a given frequency. Alternatively, there are very simple expressions. A new theory has been put forward that fibrous material absorbs sound by the fibre|s fluctuation. This theory has been justified by the equation obtained from the vibration analysed in this paper as well as the empirical sound absorption formula of fibrous material in the author|s previous paper.
Keywords: fibre fluctuation; maximum tension; compress modulus; sound absorption coefficient; fibrous material; acoustic behaviour; porous materials; elastic sound absorption.
International Journal of Vehicle Noise and Vibration, 2008 Vol.4 No.3, pp.190 - 204
Available online: 08 Dec 2008 *Full-text access for editors Access for subscribers Purchase this article Comment on this article