Extension of Double Porosity Model to Porous Materials Containing Specific Porous Inclusions
Abstract:Acoustical porous materials containing specific porous inclusions are studied. An extension of double porosity model based on the homogenization hypotheses introduced by Boutin  is presented. To apply and extend Olny's model [2, 3], some hypotheses together with the identification of the different regimes rely directly on the nature of the inclusion must be respected that is why the filling material is chosen to respect those assumptions (for example high contrast of permeability,. . . ). The inclusions are supposed periodic and the frame rigid. The idea here is to use the diffusion effect already observed in double porosity case and to add poro-elastic inclusions to deal with the main disadvantage of double porosity case, i.e the presence of an hole. This hole leads to bad absorption bahavior at very low frequency and loss of performances in transmission. Experimental verifications are given by using different Kundt tubes. The semi-phenomenological model is thus validated.
Document Type: Research Article
Publication date: 2010-03-01
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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