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基于整体-局部技术的结构形状优化策略
A strategy for structural shape optimization based on global-local technique
投稿时间:2020-08-06  修订日期:2020-10-22
DOI:
中文关键词:  形状优化  应力集中  整体-局部技术  有限元方法  无梯度优化法
英文关键词:Structural shape optimization  Stress concentration  Global-local technique  Finite element method  Gradientless optimization
基金项目:
作者单位E-mail
吴志学 扬州大学 zhixue0202@sina.com 
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中文摘要:
      针对大尺度结构局部形状优化设计中的求解效率与精度之间的矛盾,提出了一种基于整体-局部技术的结构形状优化方法。首先,分析并讨论了是否考虑对切割边界的边界条件进行修正的两种优化方案的优缺点。然后,提出了一种将整体-局部技术与无梯度优化法相结合的双循环优化程序。最后,通过一系列实例对双循环优化程序的实用性、效率和结果精度进行了验证分析。结果表明:所提出的基于整体-局部技术的结构形状优化策略对解决大尺度结构局部形状优化问题,无论是在计算效率还是在结果精度方面,都具有很好的效果。
英文摘要:
      A global-local technique based optimization method is proposed with the aim of solving the contradiction between efficiency and accuracy for shape optimization design in large-scale structures. Firstly, the merits and demerits of two optimization approaches, in the conditions with and without cut-boundary displacement modification, are analyzed and discussed. Secondly, combining the global-local technique and gradientless shape optimization method, a dual loop optimization procedure is developed. Finally, sample numerical results are presented to validate and illustrate the feasibility, effectiveness and accuracy of this optimization strategy in achieving optimal design. The results show that the implementation of the global-local technique based optimization method can lead to considerable improvements in optimizing local shape in large-scale structures with reasonable efficiency and accuracy.
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