Finite element dynamic analysis of submerged laminated composite plates

The influence of the fluid medium in modifying the dynamic characteristics of composite plates considering fluid-structure coupling effect is discusse d in this paper. The complete plate-fluid system is discretised as an assem blage of finite elements assuming fluid pressure and generalised displaceme nts as the nodal unknowns for the fluid and structural domain, respectively . The resulting coupled equations of motions for these two domains in the a bsence of any viscous damping are then integrated using Newmark's algorithm . Transient analysis of both submerged isotropic and composite plates are c arried out to study the effect of submergence on the dynamic characteristic s namely, natural frequencies as well as amplitudes and period of response.