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유전알고리즘을 이용한 비균일 하중을 받는 구조물의 지지 위치 최적화 연구
김근홍(G.H. Kim),이영신(Y.S. Lee),김학근(H.K. Kim),허남일(N.I. Her),사정우(J.W. Sa),양형렬(H.L. Yang),김병철(B.C. Kim),박주식(J.S. Bak) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
It is important to determine supporting locations for structural stability of a structure under non-uniform<br/> load in space interfered by other parts. In this case, There are many local optima with discontinuous design<br/> space. Therefore, The traditional optimization methods based on derivative are not suitable. Whereas, Genetic<br/> algorithm(GA) based on stochastic search technique is a very robust and general method. This paper has been<br/> presented to determine supporting locations of the vertical supports for reducing stress of the KSTAR(Korea<br/> super Superconducting Tokamak Advanced Research) IVCC(In-vessel control coil) under non-uniform<br/> electromagnetic load and space interfered by other parts using genetic algorithm. For this study, we develop a<br/> program combining finite element analysis with a genetic algorithm to perform structural analysis of IVCC. In<br/> addition, this paper presents a technique to perform optimization with FEM when design variables are trapped<br/> in an incongruent design space.
토카막 장치에서 자석 구조물의 조립에 관한 검토 KSTAR TF
김경민(K.M.Kim),최창호(C.H.Choi),홍권희(K.H.Hong),양형렬(H.L.Yang),유인근(I.K.Yu),허남일(N.I.Her),사정우(G.H.Kim),김학근(S.T.Kim),김근홍(H.T.Kim),김상태(J.S.Yang),김홍택(J.S.Bak),양진석(C.H.Kim),박주식(P.Z.Shick),김재호(J. Z. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
TF magnet structures are the main structural components in the KSTAR magnet systems to protect<br/> the superconducting coils from mechanical, electrical, and thermal loads. TF coil structure supports CS<br/> and PF coil system. The inter-coil structure contains adjustable shear keys and conical bolts to provide<br/> pre-loading in toroidal direction and to resist against in-plane and out-of-plane forces that are the most<br/> critical loads on the TF magnet system. The conical bolts and shear keys are specially designed to<br/> assemble easily and to provide a convenient accommodation for a good alignment. The connection plate<br/> that is one of the prototype fabrications had been manufactured to study adjustability of conical bolts<br/> and shear keys for assembly of TF coil structure. We could measure the misalignments at the keyways<br/> and conical holes with the misalignment measuring instrument.
가공열처리에 의한 Alloy 600 재료의 결정립계특성 변화와 입계부식 및 1차측 응력부식균열 거동
김진,한정호,이덕현,김영식,노희숙,김근홍,김정수,Kim, J.,Han, J.H.,Lee, D.H.,Kim, Y.S.,Roh, H.S.,Kim, G.H.,Kim, J.S. 한국재료학회 1999 한국재료학회지 Vol.9 No.9
가공열처리에 의한 결정립계조절 개념을 이용하여 Alloy 600 재료의 결정립계특성과 부식특성을 조사하였다. 가공열 처리에 따른 결정립계특성 변화를 EBSP로 분석하였으며, 결정립계특성 변화가 입계부식 및 응력부식균열 거동에 미치는 영향을 평가하였다. 가공열처리 반복에 따른 각 단계에서의 CSL 입계의 분율 변화가 두드러지지는 않았으나, 상용재료에 비하여 CSL 분율이 약 10% 이상 향상된 결과를 얻었다. 결정립계특성 변화에 따라 입계부식 저항성이 현저하게 증가하였으나, 1차측 응력부식균열 특성에 있어서는 가공열처리를 반복할수록 파단시간과 최대하중이 감소하고 평균 균열성장속도가 증가하였으며 2차 균열이 억제되는 결과를 얻었다. 결정립계의 \`fine tuning\` 기구가 이러한 부식거동변화에 작용한 것으로 해석할 수 있었다. Grain boundary characteristics and corrosion behavior of Alloy 600 material were investigated using the concept of grain boundary control by thermomechanical treatment(TMT). The grain boundary character distribution (GBCD) was analyzed by electron backscattered diffraction pattern. The effects of GBeD variation on intergranular at tack(JGA) and primary water stress corrosion cracking(PWSeC) were also evaluated. Changes in the fraction of coinci dence site lattice(CSL) boundaries in each cycle of TMT process were not distinguishable, but the total eSL boundary frequencies for TMT specimens increased about 10% compared with those of the commercial Alloy 600 material. It was found from IGA tests that the resistance to IGA was improved by TMT process. However, it was found from PWSCC test that repeating of TMT cycles resulted in the gradual decrease of the time to failure and the maximum load due to change in grain boundary characteristics, while the average crack propagation rate of primary crack increased mainly due to suppression of secondary crack propagation. It is considered that these corrosion characteristics in TMT specimens is attributed to 'fine tuning of grain boundary' mechanism.
허남일(N.I. Her),김병철(B.C. Kim),김근홍(G.H. Kim),홍권희(G.H. Hong),사정우(J.W. Sa),김학근(H.K. Kim),김경민(K.M. Kim),박주식(J.S. Bak) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Vacuum vessel of the KSTAR(Korea Superconducting Tokamak Advanced Research) tokamak is a fully<br/> welded structure with D-shaped cross-section. According to the requirements of the physics design, sixteen<br/> horizontal ports, sixteen slanted ports, sixteen baking and cooling ports, and twenty-four top and bottom<br/> vertical ports are designed for the diagnostics, plasma heating, vacuum pumping, and baking and cooling.<br/> Bellows on these ports are used for flexible components to absorb the relative displacement due to the<br/> vacuum vessel thermal expansion and the electromagnetic force between the vacuum vessel and the cryostat<br/> ports. Fatigue strength evaluation was performed to decide the dimension of the bellows. In order to assure<br/> the quality of the bellows, a prototype bellows for the neutral beam injection port has been fabricated and<br/> tested prior to main fabrication. It was conformed that the prototype bellows has sufficient fatigue strength<br/> and vacuum reliability in the expected load conditions.
가공 열처리에 의한 Alloy 600의 결정립계 특성 변화와 입계 부식 거동
김진,한정호,이덕현,김영식,노희숙,김근홍,김정수 安東大學校 工業技術硏究所 1999 공업기술연구논문집 Vol.6 No.1
가공열처리에 의한 결정립계조절 개념을 이용하여 Alloy 600 재료의 결정립계특성과 입계부식 거동을 조사하였다. 가공열처리에 따른 결정립계특성 변화를 EBSP로 분석하였으며, 결정립계특성 변화가 입계부식 거동에 미치는 영향을 평가하였다. 가공열처리 반복에 따라 각 단계별 CSL 입계의 분율이 크게 증가 할 것으로 예상하였으나, 변화가 두드러지지는 않았다. 그러나 상용재료에 비하여 가공열처리 된 시편은 CSL 분율이 약 10% 이상 향상된 결과를 얻었고, 입계부식 저항성이 증가하였다. 가공열처리된 시편의 각 단계별 CSL 분율 변화가 두드러지지 않았음에도 불구하고 입계부식 저항성이 향상된 것은, 결정립계의 'fine tuning' 기구가 이러한 부식거동변화에 작용한 것으로 해석할 수 있었다. Grain boundary properties and intergranular corrosion behavior of Alloy 600 material were investigated using the concept of grain boundary control by thermomechanical treatment(TMT). The grain boundary character distribution(GBCD) was analyzed by electron backscattered diffraction pattern. The effects of GBCD variation on intergranular attack(IGA) was evaluated. Changes in the fraction of coincidence site lattice(CSL) boundaries in each cycle of TMT process were expected to increase remarkably, but they were not distinguishable. But the total CSL boundary frequencies for TMT specimens increased about 10% compared with those of the commercial Alloy 600 material. It was found from IGA tests that the resistance to IGA was improved by TMT process. It is considered that these corrosion characteristics in TMT specimens is attributed to 'fine tuning of grain boundary' mechanism.