射频离子推力器壳体结构点阵材料拓扑优化  

Topological optimization of lattice material forshell structure of RF ion thruster

作　　者：杨立博 石波 鲁海峰 李济源 谭畅[1] YANG Libo;SHI Bo;LU Haifeng;LI Jiyuan;TAN Chang(Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)

机构地区：[1]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2023年第4期51-59,共9页Journal of Rocket Propulsion

基　　金：国家重点研发计划(2019YFC1907000)。

摘　　要：针对射频离子推力器的壳体结构轻量化要求,研究了点阵材料拓扑优化设计思路和方法。首先,通过静力学仿真和动力学仿真对原结构进行了分析,获得了结构改进基础;其次,应用结构拓扑优化方法获得了结构的传力路径;再次,结合传力路径和壳体结构的安装使用要求,获得了最佳的点阵材料优化设计域;最后,通过点阵材料优化设计,获得了最佳的点阵拓扑优化结构方案。与原结构进行对比,优化方案质量减小31.5;动力学方面,结构模态整体提升,较好避开了推力器工作时的振动频率范围;受载条件下结构最大应力降低达59~67,应力分布更加均匀,结构变形也相应减小,结构刚度有所提升。优化后结构的轻量化和性能改善验证了设计方法的有效性。Aiming at the light weight requirement of the shell structure of RF ion thruster,the idea and method of topology optimization design of lattice material were studied.Firstly,the original structure was analyzed by statics simulation and dynamics simulation to obtain the improved foundation of the structure.Secondly,the force transfer path of the structure was obtained by using the topology optimization method of the structure.Thirdly,the optimum design domain of lattice material was obtained by combining the load transfer path and the installation and use requirements of shell structure.Finally,the optimal scheme of lattice topology optimization was obtained through the optimal design of lattice materials.Compared with the original structure,the mass of the optimized scheme was reduced by 31.5.In terms of dynamics,the modals of the structure was improved,which is better to avoid the vibration frequency range of the thruster when working.Under load,the maximum stress of the structure was reduced by 59-67.The stress distribution of the structure is more uniform,the deformation of the structure is reduced correspondingly,and the stiffness of the structure is improved.The light weight and performance improvement of the optimized structure verify the effectiveness of the design method.

关 键 词：射频离子推力器 壳体 轻量化 点阵材料拓扑优化 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]