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In the multi-objective optimization of slender ring-stiffened cylindrical shells, it is difficult to balance the structural lightweight and critical pressure for overall instability, which restricts the improvement of the performance of Autonomous Underwater Vehicle. In this paper, a data-driven multi-objective optimization strategy is proposed, which can improve the critical pressure for overall instability and reduce the weight of the structure. Firstly, based on the error convergence criterion and accuracy requirement, the appropriate training set size is found in this strategy through iteration, and a low-cost and high-precision surrogate model is constructed. Then, the second-generation non-dominated sorting genetic algorithm is used to obtain the Pareto solution set. The non-inferior solution is screened by the minimum distance method based on maximum and minimum normalization, and the optimal design scheme with a well-balanced performance is obtained by combining the local accuracy enhancement strategy of the surrogate model. Using the optimization strategy proposed in this paper, the structural weight of the slender ring-stiffened cylindrical shell is reduced by 9.1%, and the critical pressure for the overall stability is increased by 13.4%. An effective design to improve the stability of the ring-stiffened cylindrical shell without increasing its weight is to increase the thickness of the cylindrical shell, increase the height of the stiffeners, and reduce their number.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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