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中文摘要：
在航天箭体结构设计中，燃料贮箱因其特殊的连接形式往往受较大的集中力作用。传统的放射肋短壳结构被用来扩散集中力以减小其造成的危害，但实际效果并不理想。本文基于拓扑优化的概念设计，综合实际短壳结构承载环境和可制造性，提出了一种“分级型放射肋”贮箱短壳结构。围绕刚度、强度、减重、稳定性和集中力扩散效果等多种需求，基于NSGA-Ⅱ遗传算法建立了多目标优化问题模型。通过形状和尺寸的协同优化策略，得到多目标优化的最优Parcto解集。通过三层级、两层级、单一层级最优设计与传统均匀放射肋设计的对比．验证了分级型放射肋设计的优势和效果；之后，结合实际工程要求选择合理的设计方案。
英文摘要：
During the structural design of space rocket, fuel tanks are usually bearing large concentrated forces due to their special form of connection. Traditional radial ribs of short shell structure are used to decrease the damage by diffusing the concentrated forces, but the actual effect is not ideal. Our present work based on the concept of topology optimization and actual bearing environment and manufacturabili- ty propose a kind of ＂hierarchical radial ribs＂ structure of short shell. Considering the engineering requirements of the stiffness, strength,weight loss, stability and diffusion effect of concentrated forces, a multi-objective optimization model using NSGA-II genetic algorithms is established. Optimized Pareto fronts in multi-objective optimization are obtained using concurrent optimization strategy integrated shape and sizing optimization. By contrast of three levels, two levels, one level and traditional radial ribs design,the advantages and effects of hierarchical radial ribs has been sufficient validated, and then a finally optimal design is selected meeting the actual requirements.
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