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Scattering and Absorption of Sound by a Compound Cylindrical Porous Absorber with an Eccentric Core

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The classical method of separation of variables along with the novel features of Biot theory of dynamic poroelasticity and the translational addition theorem for cylindrical wave functions are employed to present an exact solution for interaction of a plane acoustic wave with a composite cylindrical sound absorber suspended in air. The analytical results are illustrated with numerical examples in which a compound cylindrical absorber made of selected configurations of two common sound absorbent materials (plastic foam and light glass wool), is insonified by plane sound waves at selected angles of incidence. The backscattered form function amplitude as well as the absorption cross section spectra are calculated and discussed for representative values of the parameters characterizing the system. The effects of incident wave frequency, angle of incidence, core eccentricity and coating thickness are examined. Limiting cases are considered and fair agreements with available solutions are obtained.
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Document Type: Research Article

Publication date: 01 January 2008

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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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