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The Influence of Different Parameters on the Limiting Frequency of Wedge Absorbers for Air-Borne Sound

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In an impedance tube, the influence of the combination of three parameters: base length, density of the material of absorbing wedges, and air gap behind the wedges on the reflection factor is investigated using absorbing wedges of mineral wool with a total length of 80 cm. It is shown that only at a base length of 10 cm and less, and with a density of 100 kg/m3 and less the cut-off frequency of the reflection factor is shifted onto lower frequencies by the air gap.
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Document Type: Research Article

Publication date: January 1, 1969

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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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