CHANG Daoqing LIU Bilong LI Xiaodong TIAN Jing

(Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences  Beijing 100190)

Received Nov. 20, 2008

Revised Jan. 20, 2009

Abstract The mechanism of the sound absorption of a thin plate with piezoelectric materials shunted with passive electrical circuits is investigated using experimental measurements. The effect of shunting electrical resistance and inductance on the sound absorption coefficient, acoustic resistance and reactance of the plate is thoroughly analyzed. The experimental results show that the sound absorption coefficient and the sound absorbing bandwidth of the plate near its first resonant mode can be significantly improved by adjusting the RL parameters. 　 

PACS numbers: 43.50