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임경빈(Kyeong Bin Lim),김선재(Sun Je Kim),박석훈(Sukhoon Park),윤용산(Yong-San Yoon),이상훈(Sang Hoon Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.8
Wheels of UGV can be used to get the information about the ground. However, wheels of UGV with actively articulated suspension cannot be used as the roles because the each wheel does not remain in contact with the ground. Therefore, in this study, we proposed the indexes and models to estimate the contact wheels. First, we formulated the dynamic equations about the actively articulated suspensions and wheels. Then estimation index IWTC and IATC were developed from the equations, and analyzed the strengths and weaknesses of each index. As the results, we developed the fuzzy rule-based estimation model additionally derived from our observations. IWTC model and IATC model could eliminate the noise of about 60% in comparison with the result without the estimation model. Fuzzy model also could reduce the noise of about 83%. In addition, fuzzy rule-based estimation model had high sensitivity and precision as well as robustness.
박대원(Dae-Won Park),김선재(Sun-Jae Kim),정광석(Kwang-Seok Jung),길경석(Gyung-Suk Kil),조은제(Eun-Je Jo) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
In this paper, we analyzed the frequency spectrum of radiated electromagnetic waves generated by series arc- and corona- discharges as a basic study to develop an online diagnostic technique for power facilities installed inside switchboards. To simulate corona and series arc discharges, an arc generator specified in UL1699 and a corona generator were fabricated. The experiment was carried out in an electromagnetic shielding room, and the measurement system consists of an Ultra Log Antenna and an EMI Test Receiver. The frequency spectrum exists in ranges from 30 to 500 [㎒] for series arc discharge and 30 [㎒] to 2 [㎓] depending on defects for corona discharge. The peak frequency of series arc discharge and corona were 40 [㎒], 80 [㎒] and 35 [㎒]~160 [㎒], respectively.
박서준(Seo-Jun Park),김선재(Sun-Jae Kim),왕국명(Guoming Wang),길경석(Gyung-Suk Kil),조은제(Eun-Je Jo) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5
케이블 절연열화에 따른 단락사고가 빈번하게 발생한다. 교류 전력계통에 사용하는 케이블의 절연진단에 관한 연구는 많이 수행되었지만, 전기 철도계통과 같이 직류 전력계통에서는 연구가 극히 미흡하다. 따라서 본 논문에서는 직류 1,500V 철도 차량에 사용되는 케이블의 절연진단기술에 대해 연구하였다. 현재 일반적으로 사용되고 있는 절연저항법과 초기 또는 미소 결함도 검출할 수 있는 부분방전(Partial Discharge, PD)을 비교하였다. 절연 저항은 최대 5,000V까지 인가하였다. 부분방전은 펄스 크기, 횟수 및 T-F map으로 분석하였다. A short-circuit fault occurs frequently due to the insulation deterioration of cable. Researches on the insulation diagnosis of cable used in AC power system have been well carried out. However, few investigations have been conducted for cable used in DC power system such as the electric railway system. Therefore, this paper described the insulation diagnosis techniques for cable used in DC railway vehicles with rated voltage of 1,500V. The insulation resistance method generally used and the partial discharge (PD) method that can detect small defect at its early stage were compared. The insulation resistance was measured by applying up to 5,000V to the high voltage cable. PD were analyzed in terms of pulse magnitude, counts, and T-F map.