Vibration characteristics of multiple cabins of cylindrical shell

Based on the Flügge shell theory and wave propagation approach, the mathematical model of arbitrary boundary conditions of multiple cabins of ring-stiffened cylinder shell is established and then discussing the vibration characteristics of it. Compared with the traditional method adopting smearing out technique or beam model to deal with stiffening rings, the paper uses annular plane model to deal with stiffening rings. The structure is divided at stiffening rings, bulkhead, or driving point, annular plane model is used to deal with stiffening rings and bulkheads, and the force is treated as boundary condition, then using the continuity conditions and putting all discrete sub-structures together to get motion equation. Through the comparison with results from literature and FEM, the accuracy of the current theory is validated. In addition, the effects of bulkhead thickness and position, driving point are discussed, and analyzing what kind of boundary conditions is reasonable when cabins are truncated.