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针对有附加结构的卫星天线桁架结构,提出了一种实现结构多目标优化的综合设计方法.首先,探讨了附加结构刚度对桁架结构动力学特性的影响,以便建立精确的有限元模型,为进行优化设计奠定基础.之后,交替采用代理模型方法和人机交互方式进行结构拓扑构型设计.其中代理模型是采用优化拉丁超立方法进行试验设计,结合径向基函数近似方法生成的.最后,应用NSGA-II全局优化方法实现以重量最小化和频率最大化的多目标优化设计,并根据分层图定量可视化地从Pareto前端和Pareto最优解集中筛选最优设计方案.优化结果表明,相对于初始方案可以在基频几乎不变的情况下,重量减小29.66%.该方法有利于提高设计效率,降低全局优化的复杂度,同时能够得到满足设计要求的设计方案,适用于多目标结构优化设计.
Aiming at the satellite antenna truss structure with additional structure, a comprehensive design method for multi-objective optimization of structure is proposed.Firstly, the influence of additional structural rigidity on the dynamic characteristics of truss structure is discussed in order to establish accurate finite element model And then lay the foundation for the optimization design.Secondly, the agent topology and the topology design are alternated by the agent model and the human-computer interaction.Agent model is designed by the optimized Latin hyper-method and combined with radial basis function approximation.Finally, The NSGA-II global optimization method is used to realize the multi-objective optimization with weight minimization and frequency maximization, and the optimal design scheme is quantitatively and quantitatively filtered from the Pareto front-end and the Pareto optimal solution according to the hierarchical graph. The optimization results show that the relative The initial scheme can reduce the weight by 29.66% with almost unchanged fundamental frequency. This method is helpful to improve the design efficiency, reduce the complexity of global optimization, and can meet the design requirements to meet the design requirements for multi-target structure Optimize design.