Abstract: In the process of solid rocket motor (SRM) grain configuration design, structure integrity of grain is hard to satisfy when loading fraction is high. The secondary development of commercial finite element software MSC.Patran/Marc was implemented by PCL (Patran Command Language), and the parameterized model of star shape grain was constructed. Genetic Algorithm (GA) was applied to the shape optimization of the star shape grain, with the best structure integrity as objective function and loading fraction as constraint condition. The grain shape of minimum Von mises strain was found. Meanwhile, the area loading fraction was kept not less than 0.85. The present method is available and convenient for sorts of SRM grain configuration design.

Key words: Solid rocket motor; Star shape grain; Shape optimization; GA⁺; FEM⁺; Grain configuration design

摘要： 在固体火箭发动机药柱设计过程中,装填分数较大的药柱结构完整性很难满足要求。利用PCL对商用有限元软件MSC Patran/Marc进行二次开发,建立星形药柱发动机的二维参数化有限元模型。在此基础上,采用遗传算法对星形药柱进行了形状优化,以结构完整性最优为优化目标,以装填分数为约束条件,得到了Von mises应变最小且面积装填分数不小于0.85的药柱形状。所提出的方法可方便地应用于各种固体火箭发动机装药设计。

关键词: 固体火箭发动机;星形药柱;形状优化;遗传算法⁺;有限元法⁺;装药设计