面向集中力扩散的回转曲面加筋拓扑优化方法

Topology optimization method for concentrated force diffusion on stiffened curved shell of revolution

为了提高航天器回转曲面加筋型连接结构的集中力扩散效率,需要开展回转曲面加筋集中力扩散结构设计。传统放射肋设计方法普遍依赖设计经验、难以满足集中力高效扩散需求。因此,提出一种面向集中力扩散的回转曲面加筋拓扑优化方法。第1步,建立了一种基于各向异性过滤技术的集中力扩散拓扑优化方法,保证拓扑优化结果满足回转曲面加筋制造工艺要求;第2步,提出了一种基于网格变形技术的拓扑优化结果智能重构方法,可高效准确地对回转曲面加筋拓扑优化结果进行模型自动重构。基于所提出方法,以卫星平台对接环这种典型的回转曲面加筋壳为对象开展算例研究,并将优化结果与传统放射肋设计结果进行对比。结果表明,所提出的优化方法可得到加筋构型清晰、满足回转曲面加筋制造工艺要求的优化结果,且具有集中力扩散效率高、网格质量依赖性低、拓扑特征重构高效等优点。

Designing concentrated force diffusion structures on stiffened curved shells is necessary to improve the concentrated force diffusion ability of spacecraft structure connectors.The traditional radial rib design method generally depends on design experience and is difficult to satisfy the requirement of efficient concentrated force diffusion in most cases.Therefore,a topology optimization method for concentrated force diffusion on stiffened curved shells is proposed in this paper.In the first step,a topology optimization method for concentrated force diffusion is developed based on the anisotropic filtering technique to ensure that the topology optimization result satisfies the manufacturing requirement of stiffened curved shells.In the second step,an intelligent reconstruction method for the topology optimization result is proposed based on the mesh deformation technique,which can efficiently and accurately reconstruct the topology optimization result in the form of the stiffened curved shell of revolution.Based on the proposed method,a case study is conducted on the docking ring of the satellite platform,which is a typical structure of stiffened curved shell.The result of the proposed optimization method is compared with those of the traditional radial rib design method and the traditional topology optimization method by commercial software.Comparison results indicate that the proposed optimization method can obtain optimization results with a clear stiffener configuration and satisfy the manufacturing requirements of the stiffened curved shell,with the advantages of good concentration force diffusion efficiency,low dependence on mesh quality,and efficient reconstruction ability of topology features.