Multiobjective optimization of orthogonally stiffened cylindrical shells for minimum weight and maximum axial buckling load |
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| Authors: | M Sadeghifar M Bagheri AA Jafari |
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| Affiliation: | 1. Department of Mechanical Engineering, Nowshahr Branch, Islamic Azad University, Nowshahr, Iran;2. Faculty of Aerospace Engineering, Shahid Sattari Air University, Tehran, Iran;3. Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Pardis Street, Molla-Sadra Avenue, Vanak Square, Tehran, Iran |
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| Abstract: | In the present research, the weight and axial buckling optimization of orthogonally stiffened cylindrical shells is carried out by the Genetic Algorithm. Constraints include two nondimensional functions of weight and buckling load in such a way that the stiffened shell has no increase in the weight and no decrease in the buckling load with respect to the initial unstiffened shell. In analytical solution, the Rayleigh–Ritz energy procedure is applied and the stiffeners are treated as discrete members. The optimization is implemented for shells with simply supported end conditions stiffened by four shapes of stiffeners including rectangular-, cee-, I-, and hat-shaped ones. The results show that the I-section and rectangular-section stiffeners are, respectively, the most and the least efficient in designing stiffened cylindrical shells for minimum weight and maximum critical axial buckling load. |
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| Keywords: | Cylindrical shells Axial buckling load Weight Multiobjective optimization Genetic algorithms |
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