基于混合可靠性分析的协同优化方法

针对在多学科设计优化中进行可靠性分析计算成本高的问题,将两种现有的可靠性分析方法与协同优化相结合,提出一种基于混合可靠性分析的协同优化方法.该方法在协同优化的子系统级进行可靠性分析,并在分析前估算优化迭代点与约束边界的距离,对靠近约束边界的点进行基于一次可靠性方法的可靠性分析,其余点仅采用均值法粗略计算其可靠度, 减少了不必要的可靠性分析成本,并将可靠性分析融入到协同优化的框架中.用优化算例对该方法进行了验证,优化结果表明该方法在保证可靠性精度的前提下,有效提高了优化效率,具有实际工程意义.

Hybrid reliability analysis method based collaborative optimization

The reliability analysis in the multidisciplinary design optimization(MDO) process causes great computational cost.Aiming to this problem,two kinds of existing reliability analysis methods were integrated into the collaborative optimization(CO),and hybrid reliability analysis based CO method was proposed.This method analyzes the reliability in the subsystem of CO model,and before each reliability analysis,the distance between the iteration point and constrained boundary was estimated.For the point near the constrained boundary,the first order reliability method was applied to analyze the reliability,while the mean value method was applied to analyze the reliability approximately for the other points to reduce the unnecessary analysis cost,then this hybrid reliability analysis process was integrated into the CO framework.Experimental results show that the hybrid reliability analysis based CO method improves the optimization efficiency without decreasing the accuracy of reliability and it has practical significance for engineering application.