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.
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November 2011
November 16 2011
Acoustical properties of double porosity granular materials Available to Purchase
Rodolfo Venegas;
Rodolfo Venegas
a)
Acoustics Research Centre,
University of Salford
, Salford M5 4WT, England
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Olga Umnova
Olga Umnova
Acoustics Research Centre,
University of Salford
, Salford M5 4WT, England
Search for other works by this author on:
Rodolfo Venegas
a)
Acoustics Research Centre,
University of Salford
, Salford M5 4WT, England
Olga Umnova
Acoustics Research Centre,
University of Salford
, Salford M5 4WT, England
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 130, 2765–2776 (2011)
Article history
Received:
April 14 2011
Accepted:
September 11 2011
Citation
Rodolfo Venegas, Olga Umnova; Acoustical properties of double porosity granular materials. J. Acoust. Soc. Am. 1 November 2011; 130 (5): 2765–2776. https://doi.org/10.1121/1.3644915
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