http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박동성(D.-S. Park),주재준(J.-J. Joo),문경모(K.-M. Moon),장용복(Y.-B. Chang),박영민(Y.-M. Park),김남원(N.-W. Kim),이현정(H.-J. Lee),곽상우(S.-W. Kwag),송낙형(N.-H. Song),우인식(I.-S. Woo),양형렬(H.-L. Yang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Korea Superconducting Tokamak Advanced Research (KSTAR) was constructed for Korean fusion research and has been operated successfully since 2008. Different from other tokamak devices, KSTAR is fully superconducting (SC) magnet tokamak which consists of 30 magnets and is made of Nb₃Sn and NbTi superconductor. To reach appropriate operating condition of the KSTAR SC magnets, the magnets temperature should be cooled down to liquid helium temperature. A Helium Refrigeration System(HRS) with an exegetic equivalent cooling power of 9㎾ at 4.5K is dedicated to cool down and keep the KSTAR SC magnets in cryogenic temperature. Since the commissioning period and the first campaign of KSTAR, the HRS has showed sufficient performance for the KSTAR SC magnets operation. The estimated time of cool-down for KSTAR cold components was 30 days, but the KSTAR SC magnets were reached to cryogenic temperature in 23 days at the first cool-down operation. Due to the long period of the KSTAR campaign, the reliable operation of the HRS is as important as its performance. During the past 4 years of campaign, the abnormal events were occurred several times and they were influenced to the reliability of the KSTAR HRS and the system availability was decreased. This paper will present the operation result of the KSTAR HRS since the first campaign and the record of the abnormal events and reliability will be discussed.
문경모(K.M. Moon),주재준(J.J. Joo),박동성(D.S. Park),장용복(Y.B. Chang),곽상우(S.W. Kwag),송낙형(N.H. Song),이현정(H.J Lee),박영민(Y.M. Park),김남원(N.W. Kim),김세현(S.Y. Kim),우인식(I.S. Woo),양형렬(H.L. Yang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The helium refrigeration system (HRS) has been operated since the 1st KSTAR campaign in 2008. It is necessary of many efforts for the stable operation of the KSTAR HRS, because the HRS consists of many components such as the compressors, motors, turbines, pumps, valves and so on. So that reason, there had been several abnormal events on the HRS such as the oil pump failures, the turbines trip, the supercritical helium (SHe) circulator trip and the cold compressor (CC) failure until the 3rd campaign of KSTAR. Some of the abnormal events were the severe to the HRS operation and the rest of them were minor. To prevent such abnormal events, the careful maintenance jobs were performed. In this paper, the brief operation result during the 4th KSTAR campaign will be presented.
장용복(Y.B. Chang),박동성(D.S. Park),주재준(J.J Joo),문경모(K.M. Moon),김남원(N.W. Kim),송낙형(N.H. Song),곽상우(S.W. Kwag),이현정(H.J. Lee),박영민(Y.M. Park),양형렬(H.L. Yang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The Helium Refrigeration System(HRS) supplies the Supercritical Helium(SHe) to the Korean Superconducting Tokamak Advanced Research(KSTAR) cold components such as the 16 toroidal field(TF) coils, TF structure, the 14 polodial field(PF) coils, and CS structure. All closed loop of the SHe path are arranged as two parallel circuits for TF and PF coils. For the plasma operation of KSTAR, the SHe mass flow is required more than 300 g/s for each circuit.
2011년 KSTAR 캠페인 중 HRS 비상정지 복구 결과
주재준(J.J. Joo),문경모(K.M. Moon),박동성(D.S. Park),장용복(Y.B. Chang),곽상우(S.W. Kwag),송낙형(N.H. Song),이현정(H.J. Lee),박영민(Y.M. Park),김남원(N.W. Kim),우인식(I.S. Woo),양형렬(H.L. Yang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
The KSTAR cool-down operation is divided 3 steps. One is cool down from ambient temperature to 4.5 K and another is keeping cryogenic state during the plasma experiment and the other is warm up to room temperature. During the 4th campaign of KSTAR, the Helium Refrigeration System (HRS) had been operated for 4 months. In this period, four times of the emergency shutdown (ESD) were happened due to the various reasons. The recovery process from the ESD should be different depending on the temperature of KSTAR cold system and the HRS operating status. At each phase, recovery procedure and recovery period are different.
이제묘(J. M. Lee),김영진(Y. J. Kim),박동성(D. S. Park),임동석(D. S. Lim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Because of insufficiency of energy resources and pollution of environment, it is necessary to develop alternative energy sources. Nuclear fission energy is used widely for source of electric power but being restricted due to radioactivity problem. Nuclear fusion is highlighted as the new generation of nuclear energy and researched worldwide because of low risk of radiation effect. The representatives of fusion research is China's EAST, KSTAR of Korea and ITER of world. Korea Superconducting Tokamak Advanced Research(KSTAR) project is on progress for the completion in August, 2007. In this study, the research of utility system for KSTAR be carried out. The utility system of KSTAR is consist of water cooling & heating system, N₂ gas system, DㆍI water system, service water system and instrument air & auto control system. The progress of KSTAR utility system is under commissioning state after construction completion. The optimal operation scenario will be verified during commissioning and adopted to the KSTAR operation.
TiNi/Al6061 형상기억 복합재료의 제조방법에 따른 강도특성
박영철,박동성,구후택 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.2
All alloy matrix composite with TiNi shape memory fiber as reinforcement has been fabricated by hot pressing to investigate mechanical properties and cold rolling was carried out to increase mechanical properties. The stress-strain behavior of the composites was evaluated at temperatures between 363K and room temperature as a function of pre-strain, and it showed that the yield stress at 363K was higher than that of the room temperature. Especially, the yield stress of this composite increases with increasing the amount of pre-strain, and it also depends on the volume fraction of fiber and heat treatment. It was verified that cold rolling was a good method to increase the strength of TiNi/A16061 composite.