Abstract

Considering the finite deformation theory, the nonlinear equations of motion which govern shells of revolution are derived. As there are some cases where the Donnell equation can not be applied, the finite element method is applied to shells of revolution. The obtained nonlinear equations of motion have many unkowns, and are not expressed by normal modes. If the modal analysis procedure is applied to the equations of motion, which is equivalent to the Galerkin method, they are transformed into the equtions of motion expressed by normal modes of which degrees of freedom are selected arbitrary. In the process we can make clear the mechanism of the coupling way in nonlinear spring terms caused by the coupling of different harmonic numbers in the circumferential directions. Considering the mechanism we can forcast whether there is a nonlinear term in a system or not. So we can show the form of nonlinear equations of motion for the system.

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