Sound absorption of porous metals at high sound pressure levels.
This paper is a study about sound absorption properties of porous metals at high sound pressure levels. A method of deriving the nonlinear static flow resistance for highly porous fibrous metals is proposed by solving Oseen's equation to take account of the inertia effect, validated by experiments of airflow measurement. In order to predict nonlinear sound absorbing performance of a finite thickness porous metal layer, a numerical method is employed, verified by sound absorption measurement in an impedance tube. Accordingly, the effects of the nonlinear coefficient on the porous metal sound absorption are investigated.
Wang
Xiaolin
X
Key Laboratory of Noise and Vibration Research, National Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China. wangxl@mail.ioa.ac.cn
Peng
Feng
F
Chang
Baojun
B