期刊
APPLIED ACOUSTICS
卷 71, 期 5, 页码 411-417出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2009.11.014
关键词
Micro-perforated panel (MPP); Double-leaf MPP; Sound absorption; Wave theory; Electro-acoustical equivalent circuit analysis
类别
资金
- Takahashi Industrial and Economic Research Foundation
So far the electro-acoustical equivalent circuit analysis has been widely used to analyse micro-perforated panel (MPP) absorbers, however, as for the double-leaf MPP the equivalent circuit analysis inevitably includes an approximation. In this paper, the sound absorption characteristics of a double-leaf MPP absorber backed by a rigid wall are analysed by wave theory using Helmholtz-Kirchhoff integral formulation to obtain a strict solution. The present wave theory is experimentally validated with existing measured results. The theory is also compared with the equivalent circuit solutions so that the differences between the two theories appear and the effect of the approximation is clarified. The comparison shows that the difference mainly appears in the vicinity of the resonance peaks: the differences occur in the resonance frequencies and the absorption coefficient at frequencies between the two resonance peaks. (C) 2009 Elsevier Ltd. All rights reserved.
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