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장강원(Gang-won Jang),이신영(Sin-Young Lee),안서욱(Seo-Wook Ahn) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Continuous movement of teeth during the orthodontic treatment is simulated by using the finite elment method. Traditional expectation of a tooth movement is made based on the stresses on the periodontal ligaments. In this research, the long-term movement of teeth is simulated by continuously considering the deformation of the orthodontic system. To this end, the total treatment period is split into many small time steps, during each of which the permanent deformation of teeth is calculated in proportion to the instantaneous deformation of the teeth. In terms of the finite element analysis, when the current time step is changed to the next time step, the finite element model of the next time step is rebuilt by updating the spatial positions of the nodes of the current time step, which is performed by adding the current node positions and the corresponding displacements of the current time step.
Topology Optimization of MEMS Structures Considering Etching Uncertainty
Gang-Won Jang(장강원),Nico P. van Dijk,Fred van Keulen 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Topology optimization for reliable micro mechanical structures with respect to geometric uncertainties during etching process is presented by using the level-set method. The etching uncertainty is treated as the bounded-but-unknown parameter and the performance drops by the worst etched micro structures are limited as the constraint form of optimization. To this end, models of the over-or under-etched structures should be consistently built from the nominal models during the whole optimization process, which is very hard by using conventional SIMP-based topology optimization methods. By using the level-set method, due to the implicit boundary representation and the signed distance property of the level-set function, models according to the uncertain etching parameter can be easily constructed. The effectiveness of the proposed approach is verified through design examples for mean compliance minimization problems and compliant mechanism problems.
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.