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Einfluß der Querunterteilung von Absorbern auf die Schallausbreitung in Kanälen

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The sound field in a duct with periodically arranged partition walls in an absorbing wall is calculated by spatial Fourier synthesis. Several boundary conditions are given for narrow gaps between the walls which lead to the determination of the field components (spatial harmonics) and to equations for the propagation constant. Numerically computed examples show that partition walls, even thin ones, prevent the realization of the maximum attenuation predicted by Cremer from his theory of a homogeneous absorbing wall. With a comb-line, the periodicity of the wall introduces new attenuation maxima as well as a fluctuating sound pressure and phase along the duct. The measurements agree well with the numerical results.
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Document Type: Research Article

Publication date: January 1, 1965

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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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