A profiled structure with improved low frequency absorption.

Wu, T; Cox, TJ; Lam, YW

Abstract

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.

Citation

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. https://doi.org/10.1121/1.1412443

• 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
• DOI: https://doi.org/10.1121/1.1412443
• Publisher URL: http://dx.doi.org/10.1121/1.1412443
• 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.