When designing shell structures, predicting the vibration characteristics is important to estimate the safety to avoid the fracture by the resonance. In this paper, natural frequency, mode shape was studied. The comparison between FEM and modal test o...
When designing shell structures, predicting the vibration characteristics is important to estimate the safety to avoid the fracture by the resonance. In this paper, natural frequency, mode shape was studied. The comparison between FEM and modal test of the stiffened cylindrical shell was conducted. In order to optimize the vibration characteristic, subproblem approximation method was applied. Stiffened dimension of T-shape as a design variable function and volume of total stiffeners as a constraint function are used. Maximizing the fundamental natural frequency was studied in this paper. Especially, effects on the ring stiffener was studied by controlling the number of the ring stiffener. And each result was conducted by the optimization method.