题目：Simultaneous topology and size optimization of 3D variable-length structures

报告人：孙加亮 讲师（航空学院航空航天交叉研究院）

时间：2019年11月21日（周四）下午2：30

地点：明故宫校区A18-209会议室

主办单位：科协、航空学院、航空航天交叉研究院

报告内容摘要：

    An efficient optimization approach is proposed to simultaneously optimize the topology and geometrical sizes of a 3D variable-length structure. First of all, in a unified global coordinate system, a flexible multibody system model is established to describe the extension and contraction dynamics of a variable-length structure. The variable-length flexible structure is meshed by the proposed arbitrary Lagrangian–Eulerian (ALE) solid elements of absolute nodal coordinate formulation (ANCF). To consider the variable-length behaviors, the classic equivalent static loads (ESL) is redefined by introducing the concept of virtual design domain. With the help of the ESL, the dynamic response optimization of the variable-length structure is turned into a static one. A simultaneous topology and size optimization approach is initially proposed via the moving morphable components. By appropriately arranging the initial configuration of the components and linking all or part of the design variables of a component with others’, the variable-length structure can be designed as a homogeneous or heterogeneous periodic structure. The approach is numerically implemented via an additional constraint that modifies the sensitivities with respect to some design variables. Finally, a few numerical examples are presented to demonstrate the effectiveness and efficiency of the proposed optimization approach.

报告人简介：

    孙加亮，南京航空航天大学航空学院讲师，工学博士。2019年3月博士毕业于南京航空航天大学，同年6月入职航空航天交叉研究院。2017年9月至2018年9月，在丹麦技术大学访问一年。目前主要从事多柔体系统动力学、可展开空间结构动力学建模与优化设计等研究，在大变形非线性计算、动力学拓扑优化等方面发表论文10余篇，其中SCI期刊论文7篇。