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Acoustical properties of double porosity granular materials

Venegas , R and Umnova, O 2011, 'Acoustical properties of double porosity granular materials' , The Journal of the Acoustical Society of America (JASA), 130 (5) , pp. 2765-2776.

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    Abstract

    Granular materials have been conventionally used for acoustic treatment due to their sound absorptive and sound insulating properties. An emerging field is the study of the acoustical properties of multiscale porous materials. An example of these is a granular material in which the particles are porous. In this paper, analytical and hybrid analytical-numerical models describing the acoustical properties of these materials are introduced. Image processing techniques have been employed to estimate characteristic dimensions of the materials. The model predictions are compared with measurements on expanded perlite and activated carbon showing satisfactory agreement. It is concluded that a double porosity granular material exhibits greater low-frequency sound absorption at reduced weight compared to a solid-grain granular material with similar mesoscopic characteristics.

    Item Type: Article
    Additional Information: Copyright (2011) 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. The following article appeared in [Venegas and Umnova, Acoustical properties of double porosity granular materials, J. Acoust. Soc. Am., Vol. 130 (5), p 2765-2776 (2011)] and may be found at (http://dx.doi.org/10.1121/1.3644915).
    Themes: Built and Human Environment
    Schools: 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: Rodolfo Venegas
    Date Deposited: 24 Nov 2011 11:40
    Last Modified: 18 Aug 2014 14:46
    URI: http://usir.salford.ac.uk/id/eprint/19008

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