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Venegas, R; Umnova, O
Publisher: Acoustical Society of America
Languages: English
Types: Article
Subjects: built_and_human_env

Classified by OpenAIRE into

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