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장강원,김윤영 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.2
This investigation is concerned with the topology optimization using displacement-based nonconforming finite elements for problems involving incompressible materials. Although the topology optimization with mixed displacementpressure elements was performed, a displacement-based approach can be an efficient alternative because it interpolates displacement only. After demonstrating the Poisson locking-free characteristics of the employed nonconforming finite elements by a simple patch test, the developed method is applied to solve the design problems of mounts involving incompressible solid or fluid. The numerical performance of the nonconforming elements in topology optimization was examined also with existing incompressible problems.
Sub-workspace design of binary manipulators using active and passive joints
장강원,남상준,김윤영 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.9
This paper is concerned with an efficient continuous variable optimization method for determining an optimal configuration of passive and active joints of a binary manipulator when it operates within a desired sub-workspace. When joints are passive, their states, either stretched or contracted, are also determined by the developed method. Manipulator operations in a sub-workspace can avoid unnecessary actuations, resulting in energy saving. A technique to increase the sub-workspace concentration degree for a given maximum number of allowable active joints is also suggested.
그라운드 빔 조인트 기반 위상최적화법을 이용한 프레임 구조물의 조립 위치 및 강도 설정
장강원,김명진,김윤영 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Most frame structures cannot be manufactured in a single-piece form. Ideally, when a structure is built up by assembling multi pieces, assembly at the joints should be rigidly performed enough to have almost full stiffness, which is difficult for practical reasons such as manufacturing cost and time. In this research, we aim to develop a manufacturability-oriented compliance-minimizing topology optimization using a ground beam model incorporating additional zero-length elastic joint elements. In the present formulation, design variables control the stiffness of zerolength elastic joints, not the stiffness of beams. Because joint stiffness values at the converged state can be utilized to select candidate assembly locations and their strengths, the technique is extremely useful to design multi-piece frame structures. An optimal layout is also extracted based on the stiffness values.
평면외 굽힘하중을 받는 세 개의 직사각단면 박판보로 구성된 조인트 구조물의 해석
장강원(Gang-Won Jang),김윤영(Yoon Young Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A rectangular cross-sectioned three-beam-joint structure under out-of-plane bending loads is analyzed by investigating transfer relation of cross-section deformations at the joint. The higher-order beam theory considering warping and distortion deformations is employed to deal with the complex deformation patterns of the beam cross-section near the joint. To obtain the joint matching condition among one-dimensional displacement measures, the continuity of three-dimensional displacements on the shared edges of the joint is considered. By doing this, the flexibility of the three-beam joint can be estimated very accurately without using any artificial parameters such as rotational springs. Interactions among deformations at the joint such as between torsional rotation and distortion are also naturally derived. The effectiveness of the proposed approach will be verified by comparing its finite element solutions with those of shell elements.