中文摘要：

结合机械结构设计的一般过程,提出了一种＂整体层-局部层＂的两层的优化模型。首先在＂整体层＂对整个机械系统的总体设计方案进行优化,然后在＂局部层＂完成主要结构的优化。阐述了两层设计变量及目标函数划分方法,给出各层优化模型的一般表达式,在此基础上讨论了该分层模型的协调和收敛方法,最终得到完整的机械结构整体优化策略。文中以7500×10^3kg浮吊金属结构的整体优化为例,详细讨论了高维、多目标机械结构整体优化建模过程。结果表明笔者提出的分层优化模型可行、有效,可适用于大型复杂机械结构的整体优化问题。

英文摘要：

We present a ＂global-local＂level optimization model according to the mechanical structure design process. First,the general plan is optimized in the＂global-level＂,then the optimization of the structures is completed in the＂local-level＂. The dividing method of design variables and objective functions of the two levels is specified,and the general expressions of each level are given. On this basis,the coordination and convergence methods are discussed,and a global optimization strategy for mechanical structures is completed. Finally,the structure optimization of 7500 ×10^3 kg floating crane is given as an example,and the modeling process of a high-dimension and multi-objective global system is detailed. The results show that the optimization model and method in this paper are valid and effective for large complex mechanical structures.