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Relaxationsschalldämpfer

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Subject of the paper is the use of relaxation phenomena for the attenuation of sound in ducts. The effectiveness of most absorption attenuators is based on a combination of absorption by porous materials and resonance phenomena. Wide band attenuation can then only be achieved by connecting variously tuned units in series. As against this, relaxation phenomena are advantageous because of their wide band attenuation and allow for a uniform construction of the entire attenuator.

The relaxation attenuation is obtained by connecting the duct with additional volumes via flow resistances. The lower limiting frequency of such damping units is given by the product of flow resistance and compliance of the volume. Any required limiting frequency can thus be obtained by suitable choice of the flow resistance without special demands on the minimum depth of the volume. The size of the additional volume determines only the amount of damping but not its limiting frequency.
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Document Type: Research Article

Publication date: January 1, 1961

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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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