ACOUSTIC TRANSMISSION THROUGH A 3-D ORTHOTROPIC MULTILAYERED INFINITECYLINDRICAL-SHELL .1. FORMULATION OF THE PROBLEM

The subject of this paper is the mechanical and acoustical behaviour o f an infinite shell with any number of layers and composed of orthotro pic material. In each layer, we take into consideration a ''3-D field displacement'' and the bending, membrane, shear, longitudinal and rota tional inertia effects. As compared to previous work, the new approach includes the introduction of the transverse deformation in the thickn ess. By introduction of forces of excitation on the external faces of each layer, it is possible to establish the interface conditions: stru cture-structure and fluid-structure. The transmission loss of the shel l excited by oblique plane waves is calculated. In this first part the formulation of the problem is presented.