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Forced Response of a Sandwich Plate with a Flexible Core Described by a Biot-Model

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There is a great interest in computational models describing the behaviour of coupled acoustic–structural systems. A finite element programme for acoustics has been developed incorporating a variety of elements including porous material elements described by the Biot-theory and plate elements described by thick plate theory (Reissner-Mindlin). This paper makes up a part of an experimental verification of models incorporating these plate and porous material elements, models which may be used for the prediction of airborne and impact sound transmission in multilayer systems, of which sandwich constructions are an important type. Forced response measurements have been performed on sandwich beams, a 50 mm thick polyurethane foam core sandwiched between two aluminium plates, 2–3 mm thick. The measured input and transfer mobility data as well as plate vibrational shape have been compared with both 2- and 3-dimensional models of the beam. Due to the complexity of the model description, in particular the porous material, a rather simple 3D-model was used. However, the fit between measured and calculated data was quite satisfactory indicating that a 3-dimensional model is necessary for better precision particularly in frequency ranges where dilatational motion, or antiphase motion of the skins, is important.
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Document Type: Research Article

Publication date: 1997-11-01

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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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