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Title: Hybrid noise control in a duct using a light micro-perforated plate
Authors: Wang, X
Choy, YS 
Cheng, L 
Issue Date: Dec-2012
Source: Journal of the Acoustical Society of America, Dec. 2012, v. 132, no. 6, p. 3778-3787
Abstract: A plate silencer consists of an expansion chamber with two side-branch cavities covered by light but extremely stiff plates. It works effectively with a wide stopband from low-to-medium frequencies only if the plate is extremely stiff, to ensure a strong reflection of acoustic wave to the upstream in the duct. However, a plate with a slightly weak bending stiffness will result in non-uniform transmission loss (TL) spectra with narrowed stopband. In this study, a hybrid silencer is proposed by introducing micro-perforations into the plate to elicit the sound absorption in order to compensate for the deficiency in the passband caused by the insufficient sound reflection in a certain frequency range due to weaker plate stiffness. A theoretical model, capable of dealing with the strong coupling between the vibrating micro-perforated plate and sound fields inside the cavity and the duct, is developed. Through proper balancing between the sound absorption and reflection, the proposed hybrid silencer provides a more flattened and uniform TL and a widened stopband by more than 20% while relaxing the harsh requirement on the bending stiffness of the plate. Theoretical predictions are validated by experimental data, with phenomenon explained through numerical analyses.
Keywords: Acoustic fields
Acoustic wave absorption
Numerical analysis
Perforated plates
Sound insulating materials
Publisher: Acoustical Society of America
Journal: Journal of the Acoustical Society of America 
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4763550
Rights: Copyright 2012 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
The following article appeared in Wang, X. N., Choy, Y. S., & Cheng, L. (2012). Hybrid noise control in a duct using a light micro-perforated plate. Journal of the Acoustical Society of America, 132(6), 3778-3787 and may be found at
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