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Effects of porous covering on sound attenuation by periodic arrays of cylinders.

Umnova, O, Attenborough, CM and Linton, J 2006, 'Effects of porous covering on sound attenuation by periodic arrays of cylinders. ' , The Journal of the Acoustical Society of America (JASA), 119 (1) , pp. 278-284.

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Abstract

The acoustic transmission loss of a finite periodic array of long rigid cylinders, without and with porous absorbent covering, is studied both theoretically and in the laboratory. A multiple scattering model is extended to allow for the covering and its acoustical properties are described by a single parameter semi-empirical model. Data from laboratory measurements and numerical results are found to be in reasonable agreement. These data and predictions show that porous covering reduces the variation of transmission loss with frequency due to the stop/pass band structure observed with an array of rigid cylinders with similar overall radius and improves the overall attenuation in the higher frequency range. The predicted sensitivities to covering thickness and effective flow resistivity are explored. It is predicted that a random covered array also gives better attenuation than a random array of rigid cylinders with the same overall radius and volume fraction.

Item Type: Article
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
Refereed: Yes
ISSN: 0001-4966
Depositing User: H Kenna
Date Deposited: 03 Oct 2007 12:41
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/462

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