Vibration analysis of rotating composite cylindrical shells with orthogonal stiffeners

The analytical solutions for the free vibration of the rotating composite cylindrical shells with axial stiffeners (stringers) and circumferential stiffeners (rings), that is, orthogonal stiffeners, are presented using the energy method. The cylindrical shells are stiffened with uniform interval and the stiffeners have the same material and geometric properties. The Love's shell theory based on the discrete stiffener theory is used to derive the governing equation of the rotating composite cylindrical shell with orthogonal stiffeners. The effect of the parameters such as the stiffener's height-to-width ratio, the shell thickness-to-radius ratio and the shell length-to-radius ratio is studied. The natural frequencies are compared with the previously published analytical results for the unstiffened rotating composite shell and the orthogonally stiffened isotropic cylindrical shells.