Topology Design of the Evolutionary Optimization of Structures

• Main Authors: Hsientsung Chiu, 邱顯宗
• Other Authors: 鄔詩賢
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/41673819151008716776

碩士 === 國立中興大學 === 機械工程學系所 === 102 === In engineering structural design, people usually wish the object light-weighted to reduce the manufacturing costs and increase the profits. Prior to compensation for light-weight design, not only the structural constraints need to be satisfied but also the operational durability and normal function of the object need to be considered. The above design requirements are hard to reach simultaneously by traditional structural design processes. In the past decade, accompany with the finite element method and the ESO (Evolutionary Structural Optimization) is successfully studied which may provide a new way of design-Topology Optimization. The idea is giving a design domain with loadings, boundary conditions and constraints, we can obtain a topology structure result that satisfying those constraints by Topology Optimization. Furthermore, the traditional design concept is so far changed and modern objects are thus born in the world. This thesis uses the ESO3D mod of FEAST software which developed by professor James Shih-Shyn Wu for comparing the result between ESO and the references and discussing the strong and weak point in the procedure. Results obtained here show : (1) The result is very close to the references when we use half of symmetric structures in ESO. It spends less in processing time when we use half of symmetric structures. (2) The relationship between maximum von Mises stress and Volume Fraction(VF) is irregular, sometimes the von Mises stress increasing with the VF decreasing, sometimes not. Moreover, the von Mises stress goes increasing or decreasing randomly. This result can related to the situation of removing cells in the subsections of design area. (3)The structure changes into another one in iterations when some of the areas changes. Because the change of this areas influenced the whole design domain. And causing the abnormal increase in the number of iterations.