基于Patran/Nastran的结构优化系统的工程应用

采用基于有限元软件Patran/Nastran二次开发的结构优化系统,对两个卫星结构进行了以重量为目标、考虑基频和应力等约束的优化设计.系统由用户在Patran环境下完成问题建模,优化过程中调用Nastran作结构分析并结合二级多点逼近算法寻优.设计对象是由蜂窝夹层板、不同截面形状梁、板壳等组成的典型复杂航天器结构,设计过程中还利用人机交互技术,最终使重量明显降低,为工程部门改进设计提供了依据.算例结果之一与其他结构优化系统结果一致,进一步说明了所开发系统的正确性.

Engineering applications of structural optimization system based on Patran/Nastran

Two satellite structures were optimized using a structural optimization system that was secondary developed on the base of the commercial finite element software Patran/Nastran.The mass of structure was taken as the objective function and frequency and stress constraints were considered in the optimization.The system provided a Patran environment for users to establish the model of problem,while Nastran was executed as structural analysis code and the optimizer was based on two-level multi-point approximation method.The designed examples were typical complex structures of spacecraft constructed by honeycomb sandwich panels,shells as well as beams with various cross-sectional types.Man-machine interactive ways were also adopted and the structural masses were obviously decreased.The work supplies useful datum for the industrial departments to improve the current designs.The results of the developed system comply well with other's for one of the examples,and the validity of the system is further verified.