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Enhancing Sound Attenuation in Permeable Heterogeneous Materials via Diffusion Processes

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This paper illustrates the concept of inducing multiple local non-equilibrium pressure states in permeable rigidframe materials by means of introducing specific geometrical patterns or material heterogeneities locally. This results in enhanced sound attenuation that is mostly determined by the local non-equilibrium pressure states of diffusive type. We illustrate the results by introducing analytical models for the long-wavelength acoustical properties of i) a perforated porous matrix with concentric annular and cylindrical porous inclusions co-axially inserted in the perforations, and ii) a heterogeneous array of highly resistive porous cylinders. The models predictions are compared with numerical simulations showing good agreement.
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Document Type: Research Article

Publication date: 01 July 2018

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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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