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Behavior of rigid – porous layers at high levels of continuous acoustic excitation: Theory and experiment

Umnova, O, Attenborough, K, Cummings, A and Standley, E 2003, 'Behavior of rigid – porous layers at high levels of continuous acoustic excitation: Theory and experiment' , The Journal of the Acoustical Society of America (JASA), 114 (3) , pp. 1346-1356.

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Abstract

A model for the propagation of high amplitude continuous sound through hard-backed rigid-porous layers has been developed which allows for Forchheimer's correction to Darcy's law. The nonlinearity associated with this is shown to be particularly important in the range of frequencies around layer resonance. The model is based on the introduction of particle velocity dependent flow resistivity into the equivalent fluid model expression for complex tortuosity. Thermal effects are accounted for by means of a linear complex compressibility function. The model has been used to derive analytical expressions for surface impedance and reflection coefficient as a function of incident pressure amplitude. Depending on the material parameters, sample thickness, and frequency range the model predicts either growth or decrease of reflection coefficient with sound amplitude. Good agreement between model predictions and data for three rigid-porous materials is demonstrated.

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 12:48
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/466

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