摘要
分析了渐进结构优化方法的优化过程.针对固定删除率所带来的问题,提出了一种提高数值稳定性改进方案:将每轮预删除单元的灵敏度值之和与所有单元灵敏度值之和的比值作为预估值,用预估值来确定删除单元数;然后通过对优化过程中目标函数值的变化量进行限制,以提高优化过程中的计算稳定性.典型算例的计算初步验证了本改进方法的有效性和可行性.
This paper analyzed the process of the evolutionary structure optimization meth- od, and proposed an improved method with high numerical stability aiming at solving the problems caused by the fixed deletion rate. This improved method used the ratio of sensitiv- ity of the pre-deleted elements in each round to all elements as the predicted value to deter- mine the number of elements which should be deleted. The calculation stability of the opti- mization process was improved by limiting the amount of change of the objective function. Through the analysis of typical cases, the effectiveness and feasibility of the proposed meth- od was preliminarily proved.
出处
《长沙理工大学学报（自然科学版）》
CAS
2013年第2期57-62,81,共7页
Journal of Changsha University of Science and Technology:Natural Science
基金
湖南省芙蓉学者科研资助项目
长沙理工大学湖湘学者科研资助项目
关键词
渐进结构优化方法
变删除率
预估值
evolutionary structural optimization
variable deletion rate
predictive value
