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Direct measurement of dynamic compressibility modulus: Introducing the K-meter and experimental difficulties La mesure directe du module de compressibilité dynamique: présentation du Kmètre et de ses difficultés expérimentales.

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This paper is a contribution to the effort in improving the acoustical masking properties of skins designed for coating submarines. Dissipative materials typically used in this coating are elastomers with Poisson coefficient very close to 0.5. A new measuring cell has been developed for testing a wide range of viscoelastic materials. The operating conditions range from: 25 Hz to 2000 Hz, 1 bar to 50 bar, −10 °C to 40 °C. The aim of this research is to measure their dynamic bulk modulus . It is shown that the acoustical characterization of such materials calls for a direct measurement of the dynamic compressibility. Working principle of this device is based on a quasi-static bulk compression of samples, generated by a piezoelectric transducer. The dimensions of the cavity containing the sample are much smaller than a wavelength. The experimental difficulties encountered and the technological originality of the developed testing bench are emphasized. The calibration process is described in detail. Then, results obtained with various samples are discussed.

French
Le dispositif de mesure décrit dans cet article permet de déterminer avec précision le module de compressibilité dynamique pour une large gamme de matériaux viscoélastiques. Les mesures sont faites entre 25 Hz et 2000 Hz, de 1 bar à 50 har et de −10 °C à 40 °C. Le domaine d'application concerne l'amélioration des propriétés de masquage acoustique des revêtements utilisés sur les coques de sous-marins. Les matériaux utilisés, de type élastomère, présentent un coefficient de Poisson très proche de 0.5. On montre que la caractérisation acoustique de ces matériaux nécessite la mesure directe de leur compressibilité dynamique. Le principe de ce dispositif est basé sur une compression volumique quasi-statique de l'échantillon, générée par un transducteur piézoélectrique. Les dimensions de la cavité contenant l'échantillon sont beaucoup plus petites qu'une longueur d'onde. L'accent est mis sur les difficultés expérimentales rencontrées et sur les particularités technologiques de ce Kmètre. La procédure d'étalonnage est décrite de façon détaillée. Les résultats obtenus sur divers matériaux sont ensuite présentés.
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Language: French

Document Type: Research Article

Publication date: May 1, 1996

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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