Micro-Perforated Structures as Sound Absorbers – A Review and Outlook
Sound absorbers employing micro-perforated panels or foils have long been used as attractive measures in room acoustics. So far, however, all applications have tried to activate the holes in such structures as fluid mass elements in a Helmholtz-resonator arrangement in front of a rigid backing with an air cushion in between acting as a spring element. With a slightly modified realization of the geometry of the micro-holes it now becomes possible to use micro-perforated surface structures as stand-alone, bilaterally active acoustic elements with some obvious practical benefits for their users: the new absorbers function with a minimum of space, material and costs required. Maa's ingenious idea of a sound absorber, which can do without any damping material incorporated in it, has thus found a very useful extension "with immense possibilities ahead" as he put it when reading the manuscript.
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Document Type: Research Article
Publication date: January 1, 2006
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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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