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异形真空薄壳结构在航天、航空产品中的应用越来越广泛,基于减重和可靠性考虑,需要对这一类承受负压的压力容器进行结构强度分析和优化设计。首先应用基于经验的规则设计方法对该结构进行了强度校核。进一步,利用有限元分析软件HyperMesh、Ansys对该异形壳体建立了整体有限元模型。通过分析设计,证明该结构应力分布合理,并采用参数设计方法得到最优壁厚。从结果来看,基于经验的方法和基于有限元分析的方法得到的强度结果接近,但后一种方法不仅能够给出应力、应变的分布云图,而且在优化设计方面的选择也更加灵活。提到的设计方法对该类负压容器的设计具有一定的借鉴作用。
Special-shaped vacuum shell structure in aerospace, aviation products more widely used, based on weight loss and reliability considerations, the need for this type of negative pressure vessels to carry out structural strength analysis and optimization design. First of all, the strength of the structure is checked by the rule-based design method based on experience. Further, by using the finite element analysis software HyperMesh, Ansys, an overall finite element model of the deformed shell is established. Through the analysis of the design, it is proved that the stress distribution of the structure is reasonable and the optimal wall thickness is obtained by the parameter design method. From the results, the results obtained by the empirical method and the FEM-based method are similar to those obtained by the finite element method. However, the latter method can not only provide the distribution of stress and strain, but also provide more flexibility in the optimization design. The mentioned design method has some reference to the design of this kind of negative pressure vessel.