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Adjustable Slitted Panel Absorber

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Currently, there is a great interest in panel absorber design where porous components are excluded due to environmental and cleaning considerations. For such absorbers, the challenge is to increase the natural, viscous losses to attain an acceptable absorption bandwidth. This paper discusses a revised version of an earlier concept presented in this journal [1], where the viscous energy dissipation has been enhanced by the use of non-traditional design of the perforations. The concept is a double perforated panel, consisting of two parallel, perforated plates separated by a small distance, typically 0.1–0.3 mm. The main part of the energy dissipation takes place in the small gap between the plates. The absorber can be designed to be adjustable, allowing the lateral distance between the slits in the two plates to be varied. This offers two special features: The maximum absorption coefficient can be adjusted from unity to almost zero, and the resonance frequency can be shifted. A frequency shift of one octave at normal sound incidence has been obtained.
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Document Type: Research Article

Publication date: July 1, 2002

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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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