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Reverberation in Rectangular Long Enclosures with Diffusely Reflecting Boundaries

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Based on the technique of radiosity, a computer model has been developed for calculating acoustic indices in rectangular enclosures with diffusely reflecting boundaries. The model divides every boundary into a number of patches and replaces patches and receivers with nodes in a network. The effectiveness and accuracy of the model have been demonstrated in several enclosures. For a number of hypothetical long enclosures with diffusely reflecting boundaries computations using the model show that: with the increase of source-receiver distance the RT30 increases continuously and the early decay time (EDT) increases rapidly until it reaches a maximum and then decreases slowly; the decay curves are concave in the near field and then become convex; with a constant cross-sectional size, both the RT30 and EDT reach their maximum as the aspect ratio tends to 1; and with a given amount of absorption, the reverberation varies considerably with different absorber distributions in cross-section. For diffusely as opposed to geometrically reflecting boundaries, the sound attenuation along the length is notably greater, and air absorption is more effective with regard to both reverberation and sound attenuation.
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Document Type: Research Article

Publication date: January 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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