大型结构可靠性优化设计的大系统方法

A RELIABILITY-BASED MULTI-LEVEL OPTIMIZATION METHOD FOR LARGE-SCALE STRUCTURE

首先回顾了基于可靠性的结构设计方法并对其进行了简要的评述；其次介绍了目前正处于热点的大系统设计方法，并提出了应用大系统方法进行大型结构可靠性设计的策略．该策略的主要思路是从结构方案阶段即考虑结构可靠度指标及重量指标的最优分配．一个大型结构可以分解成一系列子系统，而该系统中的每一个又可以分解成一系列二级子系统，直至最基本的子系统．建议对于大型复杂结构，最基本的子系统并非结构元件，而应是能用有限元模型进行基于可靠性优化设计的子结构．

Based on Aulti-level optimization theory,a reliability-based optimum strategy is presented to solve the large-scale structure problem. The main idea is that the optimum distributions of structural reliability design index and weight design index are involved in the optimization Process from the conceptual design. A large-scale structure is decomposed into a multi-level substructure system, in which the reliability-based optimum solution of the lowest-level sub-structures can be obtained by the present methods.