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Influence of Cavity- Volume Damping on the Stiffness of Air Layers in Double Walls

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A long slender cavity space which is excited by plate flexural waves will have its stiffness influenced by flow resistance on two grounds:

a) the forced wave excited in the air cavity has a large amplitude, when there is no resistance;

b) in the cavity space limited in length, longitudinal resonances appear which are less pronounced the larger the resistance.

For effect a) the specific length resistance should amount to at least (5 to 10) × 103 Ns/m4; for b) similarly 102 to 103 Ns/m4 suffices. These values hold for the case that λ L/λ B is < 1. When λ L/λ B > 1, relatively small bending waves are also present and other points of view apply. The above mentioned point a) is not valid any more than the point b).

The arithmetical analysis has given, in agreement with experiment, that an empty air cavity is about 15 dB stiffer than a fillled cavity with a sufficiently large flow resistivity. Correspondingly also the sound damping at middle and higher frequencies changes in so far as the sound transmission follows only the air path. The introduction of boundary damping into a cavity space reduces substantially the stiffness as compared with an empty cavity space. It is still not so effective however as the filling of the entire cavity with a medium of sufficiently high flow resistance.
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Document Type: Research Article

Publication date: September 1, 1977

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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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