A profiled structure with improved low frequency absorption.
Wu, T, Cox, TJ and Lam, YW 2006, 'A profiled structure with improved low frequency absorption.' , The Journal of the Acoustical Society of America (JASA), 110 (6) , pp. 3064-3070.
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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.
|Themes:||Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound|
Subjects outside of the University Themes
|Schools:||Colleges and Schools > College of Science & Technology > School of the Built Environment|
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
|Journal or Publication Title:||The Journal of the Acoustical Society of America (JASA)|
|Publisher:||Acoustical Society of America|
|Depositing User:||H Kenna|
|Date Deposited:||10 Sep 2007 14:05|
|Last Modified:||27 Sep 2011 12:22|
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