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arXiv 1906.06512cs.CE
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基于投影和密度的混合拓扑优化及其在结构装配中的应用

Mixed projection- and density-based topology optimization with applications to structural assemblies

Nicolò Pollini, Oded Amir

摘要:

在本文中,我们提出了一个混合的投影和密度为基础的拓扑优化方法。其目的是结合两个参数化的好处:明确的几何表示提供特定的控制某些设计区域,而隐式密度表示提供了最终的设计自由度。这种方法特别适用于结构组件,其中结构拓扑的优化与统一公式中的子部件之间的界面形状的优化相结合。组件之间的界面由线性几何图元组成的分段轮廓定义。连接轮廓段的节点的几何坐标被用作问题中的形状变量,与传统拓扑优化中的密度变量一起使用。可变轮廓用于局部施加特定的几何约束或投影特定的材料属性。本文考虑的属性的示例是局部体积约束、局部最大长度尺度控制、分布式固体材料的可变杨氏模量以及空间可变的最小和最大长度尺度。所得到的优化方法是通用的,并且可以使用各种几何实体。通过几个数值例子证明了复杂的设计操作的潜力。

英文摘要:

In this paper we present a mixed projection- and density-based topology optimization approach. The aim is to combine the benefits of both parametrizations: the explicit geometric representation provides specific controls on certain design regions while the implicit density representation provides the ultimate design freedom elsewhere. This approach is particularly suited for structural assemblies, where the optimization of the structural topology is coupled with the optimization of the shape of the interface between the sub-components in a unified formulation. The interface between the assemblies is defined by a segmented profile made of linear geometric entities. The geometric coordinates of the nodes connecting the profile segments are used as shape variables in the problem, together with density variables as in conventional topology optimization. The variable profile is used to locally impose specific geometric constraints or to project particular material properties. Examples of the properties considered herein are a local volume constraint, a local maximum length scale control, a variable Young's modulus for the distributed solid material, and spatially variable minimum and maximum length scale. The resulting optimization approach is general and various geometric entities can be used. The potential for complex design manipulations is demonstrated through several numerical examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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