A composite sound absorber with micro-perforated panel and shunted loudspeaker.pdfVIP

Proceedings of Meetings on Acoustics Volume 19, 2013 / ICA 2013 Montreal Montreal, Canada 2 - 7 June 2013 Architectural Acoustics Session 2pAAb: Dah-You Maa: His Contributions and Life in Acoustics 2pAAb10. A composite sound absorber with micro-perforated panel and shunted loudspeaker Jiancheng Tao*, Qijin Jiao and Xiaojun Qiu ? ? *Corresponding authors address: Institute of Acoustics, Nanjing Univeristy, China, Nanjing, 210093, Jiangsu, China, jctao@ Micro-perforated panel (MPP) backed by a rigid cavity is a widely used clean sound absorber; however, its application at low frequency is limited because a deep cavity is required to achieve good sound absorption in the low frequency range. In the present paper, a composite absorber composed by an MPP and a shunted loudspeaker is proposed. The loudspeaker is installed at the back wall of the air cavity and the acoustic impendence can be optimized by adjusting the parameters of the loudspeaker and the electronic components in the shunt to improve the sound absorption performance. The prediction model of such a finite-sized composite absorber is established based on the mode analysis solution and the equivalent circuit of the loudspeaker. Both numerical simulations and experiments show that the thickness of the proposed composite absorber can be much smaller than that of traditional MPP constructions. Published by the Acoustical Society of America through the American Institute of Physics Tao et al. ? 2013 Acoustical Society of America [DOI: 10.1121/1.4800209] Received 22 Jan 2013; published 2 Jun 2013 Proceedings of Meetings on Acoustics, Vol. 19, 015068 (2013) Page 1 Redistribution subject to ASA license or copyright; see /content/terms. Download to IP: 64 On: Thu, 05 Dec 2013 06:58:57 INTRODUCTION Microperforated panel (MPP) backed by a rigid cavity was proposed to serve