Helmholtz Resonators Revisited
Tremendous efforts are extended by ambitious acousticians to invent new means for attenuating airborne sound in one way or another, be it for noise control or room acoustic purposes. Relatively few of these, however, prove successful in technical realizations. Ever so often, in an attempt to make them fit practical requirements under real working conditions, they turn out to become awfully intricate and hence indisputably expensive. Stimulated by three recent publications in this journal, which all dealt with rather complicated reactive structures derived from the ancient Helmholtz resonator principle, two relatively simple sound attenuators (so-called membrane and micro perforated absorbers) are briefly recalled here which could be qualified for solving several specific noise control and room acoustic problems of practical relevance. These are two representative examples of a larger family of sound absorbing devices investigated by the Fraunhofer Institute in the past and developed for future applications in which fibrous or porous damping materials are unwanted or dispensable.
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Document Type: Research Article
Publication date: 2000-05-01
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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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