In mission definition stage, conceptual design phase and preliminary design phase, multidisciplinary optimization is especially significant for improving integration performance of aircraft.
在飞机设计各阶段中，任务定义阶段、概念设计阶段和初步设计阶段的综合优化设计对提高飞机整体性能具有极其重要的意义。
Therefore, it is necessary to carry on the intensity examination to the rotary mechanism preliminary design, make structure improvement and conduct optimization design for the intensity weak region.
所以对回转台的初步设计进行强度校核，针对强度薄弱的区域进行结构改进和优化设计是很有必要的。
The system parameter design combining with the trajectory optimization design can efficiently improve the whole design performance of launch vehicle during its preliminary design.
在运载火箭概念设计阶段，总体参数的确定结合轨迹优化设计能最大程度地提高设计性能。
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