索网桁架式可展开天线的多目标优化设计

针对太空索网桁架式可展开天线的结构特点和性能要求建立了天线的有限元分析模型,并对其结构进行了优化设计研究.以天线的刚性周边桁架壁厚和柔性索单元内施加的预应力为设计变量,结构重量和天线表面精度为目标函数,结构的基频为约束条件,建立了天线的多目标优化数学模型.考虑到索网结构几何非线性计算的复杂性,采用遗传算法对模型进行优化求解.通过算例分析,得到了不同权重值时的多目标优化解集,优化结果对于工程实践具有一定的指导意义,也同时证明了该模型与方法的可行性和有效性.

Multi-objective Optimization for a Cable-truss Deployable Space Antenna

In this paper a FEM analysis model of cable-truss deployable antenna is proposed according to the special requirements for spaceborne antenna. Based on this FEM model,an optimal mathematic model is built with the minimum weight and surface accuracy as the objective function,the truss thicknesses and cable tensions as the design variables the natural frequency as the constraint. Since it is difficult to solve such a complex model involved geometric nonlinearity calculation,a genetic algorithm is used to faci...