检索结果-南通市图书馆

Manufacturing tolerant topology optimization

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2009年第2期25卷 227-239页

作者： ole sigmund Department

In this paper we present an extension of the topology optimization method to include uncertainties during the fabrication of macro, micro and nano structures. More specifically, we consider devices that are manufactured using processes which may result in （uniformly） too thin （eroded） or too thick （dilated） structures compared to the intended topology. Examples are MEMS devices manufactured using etching processes, nano-devices manufactured using e-beam lithography or laser micro-machining and macro structures manufactured using milling processes. In the suggested robust topology optimization approach, under- and over-etching is modelled by image processing-based ＂erode＂ and ＂dilate＂ operators and the optimization problem is formulated as a worst case design problem. Applications of the method to the design of macro structures for minimum compliance and micro compliant mechanisms show that the method provides manufacturing tolerant designs with little decrease in performance. As a positive side effect the robust design formulation also eliminates the longstanding problem of one-node connected hinges in compliant mechanism design using topology optimization.

关键词： Topology optimization Robust designCompliant mechanisms Manufacturing constraints

Topology optimization of 3D shell structures with porous infill

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2017年第4期33卷 778-791页

作者： Anders Clausen Erik Andreassen ole sigmund Department of Mechanical Engineering Solid MechanicsTechnical University of Denmark 2800 Lyngby Denmark

This paper presents a 3D topology optimization approach for designing shell structures with a porous or void interior. It is shown that the resulting structures are significantly more robust towards load perturbations than completely solid structures optimized under the same conditions. The study indicates that the potential benefit of using porous structures is higher for lower total volume *** to earlier work dealing with 2D topology optimization, we found several new effects in 3D problems. Most notably, the opportunity for designing closed shells significantly improves the performance of porous structures due to the sandwich effect. Furthermore, the paper introduces improved filter boundary conditions to ensure a completely uniform coating thickness at the design domain boundary.

关键词： porous shells topology interior perturbations opportunity dealing earlier stiffness struc

Exploiting Additive Manufacturing Infill in Topology Optimization for Improved Buckling Load

在线全文

学校读者我要写书评

暂无评论

Engineering 2016年第2期2卷 250-257页

作者： Anders Clausen Niels Aage ole sigmund Section of Solid Mechanics Department of Mechanical Engineering Technical University of Denmark Lyngby DK-2800 Denmark

增材制造可实现优质多功能构件所具有的高度复杂几何构型的制备。可以直接制备内含多孔填充的结构部件是其独有特征的一个例证。现有的设计方法还难以充分利用这一设计自由度,直接获得类似结构的设计。本文将展示涂层方法 (coating appr... 详细信息

增材制造可实现优质多功能构件所具有的高度复杂几何构型的制备。可以直接制备内含多孔填充的结构部件是其独有特征的一个例证。现有的设计方法还难以充分利用这一设计自由度,直接获得类似结构的设计。本文将展示涂层方法 (coating approach)的拓扑优化方法来作为多孔填充构件的设计方法,所设计的构件具有显著改进的临界屈曲载荷,从而使得整体结构部件的稳定性增强。传统的柔顺性拓扑优化方法极少在数学模型中考虑构件的屈曲约束,稳定性要求通常要经过后续的校核与改进过程满足。这一后续过程往往只能获得次优设计。本文所展示的方法弥补了传统柔顺性拓扑优化模型中难以考虑构件屈曲约束的缺陷。利用涂层拓扑优化方法与传统柔顺性拓扑优化同时对经典的MBB梁进行设计,并采用熔丝增材制造技术对设计结果进行了制备。实验结果验证了涂层方法的数学模型的正确性。由于填充材料的性质,在相同条件下,涂层优化得到的多孔填充结构的屈曲载荷比传统优化得到的实体结构高四倍以上。

关键词：拓扑优化制造过程屈曲载荷填充材料添加剂组件设计涂层方法设计方法

A SHORT BIOGRAPHY(Editors)

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2022年第7期38卷 F0002-F0002页

作者： Lian Shen ole sigmund Yi Sui University of Minnesota USA Technical University of Denmark Denmark Queen Mary University of London UK

*** Shen earned his Bachelor of Sciencedegree in Mechanics and Mechanical Engineering from the Department of Modern Mechanics at University of Science and Technology of China in 1993and his Doctorof Science degree in ... 详细信息

关键词： earned Doctor Massachusetts