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Schalldämmung, Abstrahlung und Impedanz von ebenen Platten mit axialer Belastung

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The influence of an axial load (tension and compression) on the acoustic properties of plates is investigated theoretically and experimentally. Starting from the bending wave equation of plates with axial loading the bending-wave number, the bending-wave phase velocity and the frequency of the limiting coincidence are calculated. In addition formulas for the transmission loss, and the sound radiation as well as the impedance of point-driven infinite plates are derived.

The possible variation of the above mentioned quantities is calculated taking into account the maximum permissible loads. The theoretical results are compared with measurements that were made using plates under tension.

Zusammenfassung

Es wird der Einfluß der axialen Belastung auf die schalltechnischen Eigenschaften von Platten theoretisch und experimentell untersucht. Ausgehend von der Biegewellengleichung für axialbelastete Platten wird zuerst die Biegewellenzahl, die Biegewellenphasengeschwindigkeit, die Grenzfrequenz und anschließend die Schalldämmung, die Schallabstrahlung und die Eingangs impedanz bei Punktanregung für den Fall der unendlichen Platte berechnet.

Unter Berücksichtigung der maximal zulässigen Belastung wird die Größe der möglichen Änderung der oben erwähnten Größen bestimmt.

Die erhaltenen theoretischen Ergebnisse werden mit den durch die Messung an zugbelasteten Platten erhaltenen Meßergebnissen verglichen.

Sommaire

On présente une étude théorique et expérimentale de l'influence d'une charge axiale (pouvant travailler à la traction aussi bien qu'à la compression) sur les propriétés acoustiques ou vibratoires des plaques. Partant de l'équation des ondes de flexion pour des plaques avec charge axiale, on calcule successivement le nombre d'onde de flexion, la vitesse de phase des ondes de flexion, la fréquence limite, l'amortissement, la radiation acoustique et l'impédance d'entrée, tout ceci dans le cas d'une excitation ponctuelle et d'une plaque infinie.

On a déterminé également les variations possibles des quantités calculées ci-dessus en tenant compte de la charge maximale admissible. Pour finir on compare les résultats théoriques avec les résultats de mesures effectuées sur des plaques soumises à des charges travaillant à la traction.
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Document Type: Research Article

Publication date: June 1, 1985

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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