A Hybrid Model For Vibroacoustic Studies
The acoustic field generated in a hard-walled, fluid-filled cavity by the random vibration of one thin flexible wall is analysed in terms of a hybrid deterministic-probabilistic model. This approach implies that the flexible wall is not amenable to a deterministic treatment owing to its high modal density and uncertainties concerning its exact geometric and material properties. Thus, a probabilistic treatment, based on vibration field correlation characteristics, is proposed for the wall. On the other hand, complete information is available for the cavity, making it tractable by deterministic acoustic modal analysis. A coupling coefficient between each acoustic mode and the wall bending wave field is employed to represent the vibroacoustic interaction, and the response obtained from a modal summation of the contributions from each acoustic mode. Comparisons are presented with experimental results obtained on a system which consists of a rigid rectangular box with one flexible wall. It is shown that narrow band and frequency-averaged sound pressure levels approach the experimental results provided that more than eight plate modes are available in the frequency band of analysis, or that the plate modal overlap factor is greater than unity.
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Document Type: Research Article
Publication date: May 1, 1999
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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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