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Körperschalldämpfung durch Reibung in der zwischen zwei Platten befindlichen Luftschicht

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A study is presented of the influence of the viscosity of a gas or fluid-like layer between two plates on the structure-borne sound in the plates. The analysis consists of determining the wavenumbers of the system. From this analysis the frequency response of the damping is found and the dependence of the losses on the thickness of the layer and on the mass-loading of the plates becomes evident. It is shown, that the damping grows inversely with the thickness of the layer, and that the case of optimum damping is reached for mass-loadings in a ratio of approximately 1 : 2.

Zusammenfassung

Die Arbeit beschäftigt sich mit dem Einfluß der Viskosität in einer Gas- oder Flüssigkeitsschicht auf die Körperschalleitung zweier Platten, die diese Schicht begrenzen. Die Rechnung besteht darin, die Wellenzahlen des Systems zu bestimmen. Aus ihnen wird der Verlauf der Dämpfung über der Frequenz und die Abhängigkeit der entstehenden Verluste von der Luftschichtdicke und dem Massen-Belags-Verhältnis der Platten ersichtlich. Es zeigt sich, daß die Dämpfung mit kleiner werdender Luftschichtdicke anwächst, und daß das Verhältnis der Plattenmassen etwa 1 : 2 für den Fall optimaler Körperschalldämpfung sein muß.

Sommaire

On a étudié l'influence de la viscosité d'une couche fluide (gaz ou liquide) sur la transmission des vibrations à travers deux plaques situées de part et d'autre de la couche fluide. On s'est proposé essentiellement de calculer les nombres d'onde du système, car il est possible d'en déduire ultérieurement les variations de l'amortissement en fonction de la fréquence ainsi que les relations entre les pertes énergétiques occasionnées et certains paramètres du système (épaisseur de la couche fluide et rapport des masses des deux plaques). On montre que l'amortissement croît lorsque l'épaisseur de la couche fluide diminue et qu'il atteint un maximum lorsque le rapport des masses des plaques est d'environ 1/2.
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Document Type: Research Article

Publication date: October 1, 1980

More about this publication?
  • 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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