In this work the nonlinear dynamic response of an imperfect circular cylindrical shell under combined static and dynamic axial load is analyzed. In order to define completely the shell behavior and to introduce a suitable expansion of the radial displacement, a buckling analysis, including the effect of geometric imperfections, is developed. The effect of the imperfections on the postbuckling path is studied. The response of the shell subjected to a sinusoidal axial excitation at its ends, giving rise to a parametric excitation, is considered. The effect of the imperfections on the critical value of the dynamic load, that causes the loss of stability of the system, is analyzed. Interesting nonlinear dynamic phenomena are observed: direct resonance with softening behavior and parametric instability with period doubling response. The effect of a contained heavy fluid on the shell vibration and stability is investigated.
Vibration and stability of compressed shells with imperfections and fluid-structure interaction / Pellicano, F.; Catellani, G.; Amabili, M.. - (2004), pp. 3891-3905. (Intervento presentato al convegno Proceedings of the 2004 International Conference on Noise and Vibration Engineering, ISMA tenutosi a Leuven, bel nel 2004).
Vibration and stability of compressed shells with imperfections and fluid-structure interaction
Pellicano F.;Catellani G.;Amabili M.
2004
Abstract
In this work the nonlinear dynamic response of an imperfect circular cylindrical shell under combined static and dynamic axial load is analyzed. In order to define completely the shell behavior and to introduce a suitable expansion of the radial displacement, a buckling analysis, including the effect of geometric imperfections, is developed. The effect of the imperfections on the postbuckling path is studied. The response of the shell subjected to a sinusoidal axial excitation at its ends, giving rise to a parametric excitation, is considered. The effect of the imperfections on the critical value of the dynamic load, that causes the loss of stability of the system, is analyzed. Interesting nonlinear dynamic phenomena are observed: direct resonance with softening behavior and parametric instability with period doubling response. The effect of a contained heavy fluid on the shell vibration and stability is investigated.
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