某卫星平台多结构工况下的优化设计

采用航天器结构优化系统ESSOSⅡ(Engineering System of Structural Optimization for Spacecraft),对某复杂卫星结构进行了以重量最轻为目标、以其中复合材料板件的铺层厚度为设计变量的优化设计,考虑发射(收拢)和在轨(展开)2种结构工况下的基频和应力等约束条件.基于2种结构工况下的有限元模型,采用二级多点逼近寻优算法进行优化求解,每一次优化迭代过程中均需对各结构工况模型作有限元分析.优化后结构重量比初始设计有明显降低,且满足收拢、展开结构工况中的所有约束条件,为卫星结构分系统的改进设计提供了依据,同时进一步验证了ESSOSⅡ系统的有效性.

Design optimization of satellite platform considering multiple structural cases

The engineering system of structural optimization for spacecraft( ESSOS II ) was applied in the optimization design of a complicated satellite structure, in which the minimum weight was taken as the objective , the layer thicknesses of composite laminate panels as the design variables, and the frequencies and stresses under two structural cases of being launched (furled) and working in orbit (deployed) as the constraints. Based on finite element models of these two structural cases, twol-evel multi-point approximation method was adopted in optimum solution and in each optimization iteration finite element analyses were performed for both structural case models. Compared with the primal design, structural weight decreases obviously after optimization , and all constraints under furled and deployed structural cases were satisfied, which provide a basis for the engineering department to improve the primal design and meanwhile also show the effectiveness of ESSOS Ⅱ .