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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.
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.