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최규형(Choi Kyu-Hyoung),정의진(Jeong Ei-Jin),강규현(Kang Gyu-Hyun) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
The main purpose of this study is to develope a Simulator for Central Traffic Controller(CTC) which can check the operating status of CTC and support the maintenance procedure. The simulator supervise the CTC processor units and the data transmission between the CTC modules and the railway station equipments to define the validity of system functions and notify whether the eqipments are good or not. With the help of the simulator we could detect the error of CTC equipments easily, repair the faults efficiently, and improve the reliability of CTC system.
철도차량 추진제어장치 FMECA를 위한 치명도 산출 기법
최규형(Kyu-Hyoung Choi),박문규(Moon-Gyu Park) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
시스템을 구성하고 있는 부품의 기능과 고장모드를 분석하여 시스템의 잠재적 고장유형을 찾아내고, 그 영향과 원인을 분석하여 제품에 치명적인 영향을 미치는 고장유형을 선택함으로써 이를 줄이거나 없애기 위한 각종 개선대책을 제시하기 위해서 FMECA(Failure Modes Effects, and Criticality Analysis) 분석기법이 사용된다. 여기서 도출된 각각의 고장모드에 대하여 치명도를 평가할 필요가 있 으나, IEC 62278규격 등에서 제시하고 있는 “Frequency-Consequence” 매트릭스 등의 정형화된 수법 은 도시철도시스템에 적용하는 데 한계가 있다. 본 논문에서는 도시철도운영기관별로 시스템 각 분야 에서 수행했던 FMECA 분석에서의 치명도 평가기법들을 조사하고 그 특성들을 비교·분석하였으며, 도시철도 차량의 FMECA 분석에 적합한 치명도 평가기법을 제시하였다
전동차 자동열차정지장치와 지상신호설비 간의 전자파 간섭
최규형(Kyuhyoung Choi),윤선호(Sunho Yoon),고영환(Youngwhan Kho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The ATS(Automatic Train Stop) system have only a train stop function at the time of emergency, and Seoul Metro is planning to replaced them with ATC(Automatic Train Control)/ATO(Automatic Train Operation) system which can provide dedicated train speed control for headway reduction and unmanned operation of train. Until all the ATS system is replaced with the new ATC system, both systems are to operate simultaneously at the same metro line. In this situation, ATS system sometimes reveals improper operation: train stops suddenly without any obstacles in front of it. These improper stop cause interruption of passenger service. The authors make it clear that these interruptions are caused by EMI phenomena between ATS on-board device and track circuit of ATC system: Signal current flowing in the track circuit is turn out to be a EMI source that prevent the ATS on-board device from normal operation. This is investigated by frequency spectrum analysis of signaling currents and frequency response of ATS on-board device analyzed by FFT(Fast Fourier Transform). The analysis shows that ATS on-board device has a frequency response covering the frequency of signaling current flowing in the track circuit. Although the two systems have different frequency range. The countermeasures to prevent these EMI phenomena are suggested in two ways. One is elimination of EMI source: blocking the signaling current of track circuit when ATS-mounted train pass. Dedicated device for automatic blocking of signaling current is developed and installed at the site. The other is enforcement of EMS(Electromagnetic Susceptibility) : setting a high-pass filter to the circuit of ATS on-board device. These measures make a success in preventing the EMI problem of Seoul Metro line 2.
최규형(Kyuhyoung Choi) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A reliability analysis is provided for DC traction motors of electrical railways which might have low reliability and short lifetime compared to AC traction motors because they have rotor windings and commutators. The reliability analysis was made using the field reliability data of DC traction motors operating on the electric railways around the Metropolitan area, which have been investigated at the maintenance depot. Failure analysis of these data shows insulation deterioration of windings and flashover over commutator slots induce the failures of DC traction motors. Minitab has been used for the reliability analysis which show that 3-parameter Weibull distributions are good for the simulation of the failure rate distribution of DC traction motors which have been used for more than 20 years. The shape parameters of Weibull distributions are 2.9 for the stators and 2.2 for the rotors of DC traction motors. The results of analysis clarified the failure rate characteristics of DC traction motors in wear out condition.