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A profiled structure with improved low frequency absorption.

Wu, T; Cox, TJ; Lam, YW

A profiled structure with improved low frequency absorption. Thumbnail


T Wu

YW Lam


It is possible to obtain good absorption from Schroeder diffusers if suitable alterations to the design are made. Interestingly, previous work has shown that good absorption appears possible below the design frequency when the diffusers are poorly constructed. This has inspired the design of a profiled absorber using perforated plates in some wells; the absorber has extended bass response. The paper presents a theory for the enhanced absorption and the important design parameters are discussed. Good agreement is shown between the prediction model and impedance tube measurements. The design of this absorber was first carried out using a numerical optimization, although a simplified design procedure is also outlined which is almost as good. The results clearly show that this type of profiled absorber extends the absorption at low frequencies while maintaining the good absorption at mid frequencies as well.


Wu, T., Cox, T., & Lam, Y. (2006). A profiled structure with improved low frequency absorption. ˜The œJournal of the Acoustical Society of America (Online), 110(6), 3064-3070.

Journal Article Type Article
Publication Date Jan 1, 2006
Deposit Date Sep 10, 2007
Publicly Available Date Apr 5, 2016
Journal The Journal of the Acoustical Society of America (JASA)
Print ISSN 0001-4966
Peer Reviewed Peer Reviewed
Volume 110
Issue 6
Pages 3064-3070
Publisher URL
Additional Information Access Information : Copyright (2006) 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.


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