Nonlinear parametric vibrations of a longitudinally stiffened orthotropic cylindrical shell with filler

Using the variational principle in a geometrically nonlinear formulation The problem of parametric vibrations of a longitudinally stiffened orthotropic cylindrical shell in contact with an elastic medium and under internal pressure is solved in a geometrically nonlinear formulation using the variational principle. The influence of the external medium is taken into account using the Pasternak model. Amplitude-frequency dependences are constructed for parametric vibrations of a stiffened orthotropic cylindrical shell filled the medium.