小卫星一体化星敏支架拓扑优化

Topology Optimization of Sensor Brackets for Small Satellites

针对小卫星薄壁式铸钛一体化星敏支架减重需求,采用拓扑优化方法设计了一种面向3D打印制造的一体化星敏支架,拓扑优化计算时以刚度不低于200 Hz和重量最小化为目标得到了材料分布模型,采用形状优化和形貌优化等手段对材料分布模型进行光顺处理得到了拓扑优化设计后一体化星敏支架。经有限元分析,星敏支架刚度和强度满足要求。选择Ti6Al4V(TC4)激光选区熔化成型工艺加工了样机,验证了拓扑优化的星敏支架的可制造性。拓扑优化的一体化星敏支架重量相比薄壁式结构铸钛一体化星敏支架减重达80%。

To satisfy the lightweight design requirements of the thin-walled titanium sensor brackets of small satellites,the topology optimization method is to manufacture sensor brackets by 3D printing.The topology optimization constraint conditions are the stiffness no less than 200 Hz and the minimum bracket weight.The material distribution model is generated after topology optimization.The shape optimization and morphology optimization method are used to smooth the material distribution,and the sensor brackets with optimized topology are produced.A finite element analysis demonstrates that the mechanical stiffness and strength of the designed sensor bracket meets the requirement.The sample piece is manufactured by Ti6 Al4 V(TC4)laser selective melting(SLM)and the manufacturability is verified.The weight of the designed bracket is 80%lighter than the thin-walled titanium casting bracket.