Abstract
In this vibro-acoustic problem, an acoustic domain is confined within a partly flexible laminated composite rectangular enclosure, subjected to harmonic excitement. A mobility relation is derived from the finite element free vibration analysis, to relate acoustic pressure and structural velocity normal to the containing structure. A boundary element solver for the Helmholtz equation with 8 noded quadratic isoparametric elements is developed from pressure-velocity formulation. Velocity is specified over the rigid part of the boundary. In the interactive boundary the mobility relation correlates nodal pressures and velocities, neither being explicitly known. The pressure boundary values are solved from the boundary element equations coupled with the mobility relations, while the velocity at flexible boundary is computed from mobility relationship. New results presented here reveal the effects of the symmetric and anti-symmetric cross ply laminated composite cavity with the variation in wall thickness and increase in number of layers.
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