EDP Sciences Journals List
Issue J. Phys. IV France
Volume 02, Number C1, Avril 1992
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics
Page(s) C1-499 - C1-502
DOI http://dx.doi.org/10.1051/jp4:19921107

Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics

J. Phys. IV France 02 (1992) C1-499-C1-502

DOI: 10.1051/jp4:19921107

TRANSMISSION ACOUSTIQUE PAR DES STRUCTURES SANDWICHS DE TYPE ARIANE V : PRISE EN COMPTE DES EFFETS D'ÉCRASEMENT ET DE CISAILLEMENT TRANSVERSE

A. BLAISE and C. LESUEUR

Laboratoire Vibrations - Acoustique, INSA Lyon Bat. 303, 20 avenue A. Einstein, F-69621 Villeurbanne cedex, France


Abstract
The main goal of vibroacoustic studies on the Ariane V launch vehicle, multilayered orthotropic cylindrical structure is to achieve low magnitude internal acoustic environment. This can be do, |1| - |2|, without increasing the mass per unit area, by increasing the core thickness of the three layered basic structure. But this reduce the transverse structure stiffness ; so it is of first interest and importance to examine if the classical two dimensionnal (2D) hypothesis is a good approximation ; or if the differencies on the transmission loss (T.L) between the cases 2D and 3D (three-dimensionnal theorie including transverse thickness deformation) are very noticeable. Thus, we develop a new vibroacoustical analytical model including for each layer a 3D field displacement ; and we present some results for the T.L 2D - 3D comparison for a three layered Ariane V configuration.



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