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中文摘要：
本文依照双向进化结构拓扑优化方法（BESO）的基本思路,采用一种双区域技术,设计了一种双向进化拓扑优化方法,将设计区域划分为两个区域：用于显示结构拓扑构型的前台区域以及用于搜索单元可能生长方向的后台区域。根据结构有限元计算确定单元所在区域,并根据不同的区域,增加或删除结构单元,从而获得最优的拓扑构型。文章最后通过数值算例验证了该方法的可行性。
英文摘要：
Following the original ideas in the bi-directional evolutionary structural optimization,a bi-directional topology optimization method was designed by using a bi-region technique.The design domain is divided into two regions： foreground region which indicates optimal topology and background region which searches element growth direction.The elements were placed in foreground region or background region based on the finite element method results.In addition,the elements were added or removed according to the regions they occupy.Finally,the optimization finds an optimal topology.Numerical examples are carried out to verify this method.
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