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자기부상열차용 선형유도전동기 정특성 시험방법에 대한 연구
김정철(Kim Jung-Chul),김봉철(Kim Bong-Chul),김대광(Kim Dea-Kwang),박영호(Park Yeong-Ho),김철호(Kim Chul-Ho) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The recent trains are almost being operated by the mechanical propulsion force to drive the gear and wheel with the traction motor. However Magnetic Levitation Vehicle is differently operated. Magnetic Levitation Vehicle is applied with Linear Induction Motor(LIM) that has many advantage like to high capability of going up to slope, low noise, easy to control of speed. So domestic and many advanced countries are interested in Magnetic Levitation Vehicle and they have been studying about it continuously. Thus this paper is studied the LIM test method of static states and guess the optimum driving point by characteristic of static states for LIM. The test items are measurement of thrust force by changed air gap, measurement of thrust force and normal force by changed slip frequency etc.
김정철(Kim Jung-Chul),김대광(Kim Dea-Kwang),김봉철(Kim Bong-Chul),박영호(Park Yeong-Ho),최종묵(Choi Jong-Mook) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The traction motor for High Speed Train is being required reliability and stability for high-speed operation. And also required low noise level, high performance, compact size owing to the space and weight limitation for attaching to train, etc. As a result of requiring the low noise level and high power capacity, it is adopted forced-air-ventilation insead of self-ventilation that is generally used on electric multiple unit. Traction motor is cooled by cooling air through the air-ventilation hole. When the traction motor is operated with forced-air-ventilation, there is some abnormal noise in the specific RPM. This paper is dealing with the method to reduce the resonance phenomena by adopting the rotor blade.
LNG플랜트 건전성 확보를 위한 NDE 신뢰성 Matrix 연구
김웅지(Woong-Ji Kim),최송천(Sung-Chun Choi),유철희(Chul-Hee Yu),송성진(Sung-Jin Song),김훈희(Hun-Hee Kim),김대광(Dea-Kwang Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Liquefied natural gas has the unique distinction of being the only flammable or hazardous material. Inspection effectiveness may be introduced into the probability of failure calculation by using Bayesian analysis or more directly by modifying the model for the independent variables, the distribution function and parameters, such as mean and coefficient of variation, changed based on the NDE method and coverage used during an inspection. Available failure data from the LNG industry are often statistically unreliable. Therefore, we need to improve more accurate information data. NDE reliability matrix is to apply optimization method of the NDE method. Reliability matrix is composed with combinations of environment reliability and inspection reliability. Environment parameters consist of inspector qualification and experience, test condition and inspection reliability parameters are composed of the inspection method and process method, such as UT, ET, RT and s/n ratio, signal processing method, etc. Finally, this paper purposes that the Reliability matrix is a powerful tool for risk assessment of not only the LNG industry but also in other industry.