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초고압 가스절연개폐장치(GIS) 구동부 LINK계의 내구성 평가
신익호(I. H. Shin),한동영(D. Y. Han),송원표(W. P. Song),김덕수(D. S. Kim),이종규(J. G. Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
The principal purpose of this simulation is to visualize the fatigue damage about circuit breaker's link system following to its driving condition. High voltage GIS(Gas Insulated Switchgear) consists of many parts, CB(Circuit Breaker), DS(Disconnecting Switch), ES(Earthing Switch), etc.. Especially CB has many links and levers for its driving, opening and closing motion. First we determined load profiles at each link and lever analyzing its motion by kinematic software and correlating it's data with experimental one. Second the structural analysis of these link and lever was performed with unit load. Finally we carried out durability analysis by stress life method with Miner's damage rule and by vibration fatigue method with Dirlik solution method using stress tensors from structural and natural frequency analysis results and relative response load time histories from kinematics results.
수직 환상관내 반류 공기-물 유동에서 직접분사방식에 따른 플러딩 시작점 특성
이상천,신익호,이상무,정모,김동수,장원표,Lee, S.C.,Shin, I.H.,Lee, S.M.,Chung, M.,Kim, D.S.,Chang, W.P. 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.1
An experimental work was conducted to investigate the characteristics of the onset of flooding in vertical annuli with a direct injection mode using air and water. The onset of flooding was determined by means of pressure drop measurement while the air velocity was increased gradually under fixed liquid flow rates. Data of the onset of flooding were collected for various combinations of the tube size and the nozzle number. A theoretical analysis of the onset of flooding was also performed based on an envelope theory. The result shows that the onset of flooding in small-scale annuli can be predicted relatively well by the theory. A modified Wallis parameter was used to investigate the scaling effect of flooding phenomena in the annuli, indicating a relatively reasonable result. The number of nozzle has no effect on the flooding velocity when liquid was injected through 2, 3, 4 and 6 nozzles but the initiation of flooding was significantly expedited when 12 nozzles were employed for liquid injection.