轴压载荷下的运载火箭主结构构型优化设计

摘要

Based on failure engineering methods, optimization mathematical model is established for framed structure, joist-stiffened semirigid structure and honeycomb sandwich structure under axial compression load, and the discrete variable optimization method is adopted into special example. Numerical results show the framed structure has the highest carrying efficiency of all the configuration. Moreover, the honeycomb sandwich structure has higher carrying efficiency than joist-stiffened semirigid structure when the load is low enough, while the difference is eliminated gradually with the load increasing. It is proved that the opti-mization method presents important practical value for primary structure design in launch vehicle.%基于轴压载荷的失效工程算法，建立杆系结构、桁式半硬壳式结构和蜂窝夹层结构的优化数学模型，并采用离散变量优化方法对特定算例进行计算。数值算例表明：杆系结构明显高于其他两种结构的承载效率；蜂窝夹层结构在载荷较低时承载效率明显高于桁式半硬壳式结构，但随着载荷的增加，这种优势不再明显。分析结果证明，优化分析方法对用于运载火箭主结构的构型设计具有重要的实用价值。