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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.
ITER 진공용기 중성자 빔 Liner Liner의 열ㆍ유동 설계 검증
함진기(J.K. Ham),김영기(Y.K. Kim),김동해(D.H. Kim),사정우(J.W. Sa),김병철(B.C. Kim),안희재(H.J. Ahn) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The ITER vacuum vessel provides a high quality vacuum for the plasma as well as the first confinement barrier of radioactive materials. It has upper, equatorial and lower port structures used for equipment installation, utility feedthroughs, vacuum pumping and access inside the vessel for maintenance. The neutral beam (NB) ports located side by side at two equatorial ports provide a path of neutral beam for plasma heating and current drive. An internal duct liner around the NB is built in the NB ports, and copper alloy panels are placed in the top and bottom of the liner to protect duct surface from high-power heat loads. Global NB liner models for the upper panel and the lower panel have been developed, and flow field and conjugate heat transfer analyses have been performed to find out pressure drop and heat transfer characteristics of the liner. Heat loads such as NB power, volumetric heating and surface heat flux are applied in the analyses for beam steering and misalignment conditions. For the upper panel, it is found that unbalanced flow distribution occurs in each flow path, and this causes poor heat transfer performance as well. In order to improve flow distribution and to reduce pressure losses, hydraulic analyses for modified cooling path schemes have been carried out, and design recommendation is made based on the analyses results. For the lower panel, local flow distributions and pressure drop values at each header and branch of the tube are obtained by applying design coolant flow rate. Together with the coolant flow field, temperature and heat transfer coefficient distributions are also acquired from the analyses. Based on the analysis results, it is concluded that the lower panel for the NB liner is relatively well designed even though the given heat loads are very severe.
조승연(S. Cho),김형섭(H. S. Kim),도철진(C. J. Do),박종학(J. H. Park),사정우(J. W. Sa),엄기원(K. W. Urm),유인근(I. K. Yu),윤병주(B. J. Yoon),이강희(K. H. Lee),인상렬(S. R. In),임기학(K. H. Im),임종연(J. Y. Lim),조창호(C. H. Cho),정영수(Y. S. J 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.4(1)
한국중공업(주)에서 수행한 KSTAR 진공용기 시작품 제작이 완성됨에 따라 제작과 관련된 종합기술을 소개하고 분석하여 보았다. KSTAR 진공용기는 국내에서 제작경험이 없는 대형 진공용기이다. 따라서 이번 시작품을 통하여 구조물의 일체성과 원하는 초고진공을 얻기 위한 용접 방법을 시험하여 보았으며, 보강리브와 이중벽, 그리고 다양한 종류의 포트들로 구성된 복잡한 구조물에 대한 가공 및 조립방법을 개발해 내였다. 용접부위에 기본적인 누출시험을 수행하였으며 사용된 용접방법이 시험기준을 통과함을 확인하였다. 또한 시작품의 주 목적중의 하나인 제작 전후 치수변경측정을 통하여 대형 진공용기 조립성 및 제작성을 검토하여 보았다. 이번 시작품 제작을 통하여 발생된 문제점을 파악하고 개선책을 마련함으로써 향 후 KSTAR 진공 용기 본 제품 제작할 때 반영코자 한다. KSTAR vacuum vessel mockup was fabricated by Korea Heavy Industries. The fabrication technology chosen for the mockup is introduced and assessed in this paper. KSTAR vacuum vessel is a huge vacuum chamber of 52 cubic meters never built in this country. Through the experience of the KSTAR mockup fabrication, welding methods for obtaining both ultra high vacuum and structural integrity of the large vacuum chamber are extracted. The fabrication and assembly techniques for the complicated structure composed of reinforced ribs, double walls and various ports are also developed. A nondestructive test on the welding spot was performed and the results show that no major leaks violating the criterion were found. The one of the main objectives of the mockup fabrication is to measure the dimensions of the structure before and after fabrication, which plays an important role in the fabrication and the assembly. By assaying the problems occurred during mockup fabrication, the KSTAR mockup will provide the techniques for the fabrication of the main vacuum vessel.
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.
송재용 ( J. Y. Song ),사승훈 ( S. H. Sa ),남정우 ( J. W. Nam ),김동환 ( D. H. Kim ),최영우 ( Y. W. Choi ),김진표 ( J. P. Kim ),고재모 ( J. M. Goh ),박남규 ( N. K. Park ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.3
We investigated the breakdown patterns of silica glass under the various impacts by forensic scientific analysis. The impacts were chosen by thermal and projectiles impact stress. Thermal impacts under the fire were constructed by changing the position of the flame with gas torches. Physical impacts were constructed with the projectiles of slingshots and rifles by changing the size of the projectiles at the surfaces and the initial distance. Also we identified incident angles of the projectiles by analysis of the punching portion at the glass surface. Under the thermal impacts, the breakdown patterns were various by changing the position of the flame. Especially, the configuration of breakdown patterns had radial shape with the position of the flame at the center of the glass sheet. Under the physical impacts by the projectiles, the breakdown patterns had always radial shape
송재용 ( J Y Song ),사승훈 ( S H Sa ),남정우 ( J W Nam ),김진표 ( J P Kim ),조영진 ( Y J Cho ),오부열 ( B Y Oh ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2
This paper describes electrical fire on electric pad caused by defect of hot wires, We analyzed two type electric-using by carbon type hot wire and magnetic shielded type hot wire, First, a carbon type hot wires electric-is virtually impossible to connect hot wire as a method of electrical welding or soldering, In order to connect between hot wires, that has to splice carbon type material connector, If junction of hot wires was occurrence of poor connection on electric pad, it increase contact resistance on this junction point With increasing contact resistance, junction of hot wires on electric-generates local heating and finally leads to electrical fire. An electric-using by a magnetic shielded type hot wire happened local heating on signal wire for sensing temperature-rise caused by applying current for magnetic shielded. With increasing local heating of signal wire, insulated coating of hot wire was melted. Finally the magnetic shielded type hot wire electric pad lead to electrical fire with breakdown between signal wire and hot wire, In this paper, we analyzed shape of damage in hot wire caused by electrical local heating and investigated fire cause on electric pad due to defect of hot wires.