A Study of Wideband Absorbers in a Non-Environment Control Room: Normal Absorption Coefficient Measurement and Analysis
Abstract:This contribution concludes the study initiated in  about the wideband absorbers of the rear wall in a nonenvironment control room at the “Universidade de Vigo”. The specific acoustic impedance will be calculated from microphone signals of a p-p intensity probe, and the H 2 estimator will demonstrate that it provides the best estimate both at fixed measuring points and in scanning. The absorption coefficient calculated from the specific acoustic impedance is related to the sound field characterisation in the vicinity of the panels: in the very low frequency region it presents maxima and minima attributable to the behaviour of the channels between panels as open-closed tubes, and also shows the effect of the first transverse standing wave in fixed point measurements performed in the centre of the channel opening. This effect disappears in the scanning measurement providing an average absorption curve in a wide area in front of the absorbers. A simple model can be made from the results for the absorption of the wideband absorbers of the rear wall of the room.
Document Type: Research Article
Publication date: 2012-05-01
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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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