Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances
Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances
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DOI：
10.1016/j.ijmecsci.2007.01.008
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发表时间：
2007-08-01
影响因子：
7.3
通讯作者：
Lee, E. W. M.
中科院分区：
文献类型：
--
作者：
Lee, Y. Y.;Lee, E. W. M.
本文详细研究了带空腔的柔性弯曲微孔板的吸声特性。建立了基于经典板方程和声波方程的吸声预测理论模型。该模型同时考虑了对称和非对称结构声响应。利用电声类比的方法，建立了另一个只考虑单一结构模态和声学模态的模型。提出利用面板共振和腔共振来扩大单/双孔吸收器的吸收带宽。柔性微孔板的吸收可以通过调整其曲率来进一步增强，从而使共振频率更接近。研究了边界条件、入射角、曲率等参数对吸收的影响。单层和双层吸收体的预测结果与实测结果吻合较好。(C) 2007 Elsevier Ltd.版权所有。
In this paper, the sound absorptions of flexible curved micro-perforated panels that are backed by an air cavity are studied in detail. A theoretical model that is based on the classical plate equation coupled with an acoustic wave equation is developed for the prediction of sound absorption. This model considers both symmetrical and antisymmetrical structural acoustic responses. Using the electro-acoustic analogy approach, another model is developed that only considers single structural and acoustic modes. It is proposed to make use of panel and cavity resonances to widen the absorption bandwidth of a single/double perforated absorber. The absorption of a flexible micro-perforated panel can be further enhanced by adjusting its curvature to bring the resonant frequencies closer together. The effects of various parameters such as boundary condition, incidence angle, and curvature on the absorption are studied. Predicted results for the single and double layer absorbers show good agreement with measurements. (C) 2007 Elsevier Ltd. All rights reserved.