• 전기학회논문지
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• 제65권11호
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• pp.1913-1918
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• 2016

In order to analyze the power consumption pattern of the DC urban rail system, the method to obtain a solution establishing the current equation according to fixed position of the substation and varying position of the train is used. The proposed analysis method using the network analysis is to model the transfer function of the component constituting a direct current power supply system (dc substation, train, catenary) to the voltage and current. By multiplying the model formula consecutive, it can calculate the voltage and current of each element of power supply circuit and shows a simple case analysis.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.1020-1025
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• 2004

This research reviews the characteristics of earth pressure incurred by GRS-RW mainly used in the railroad design in order to resist large lateral load caused by train and additional load induced by facilities such as noise barrier fences, electric poles, etc. The results of test shows the existence of arching effect that horizontal earth pressure increases in the backfill while earth pressure applying to the wall reduced under GRS-RW system. In both cases, unreinforced wall and GRS-RW system, the coefficient of earth pressure (K) is about 0.4 at the rest. However, after lateral displacement occurs, the earth pressure nearly reduce down to zero under GRS-RW system while the earth pressure decreases up to 0.12 in case of unreinforced retaining wall.

• 전기학회논문지
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• 제65권1호
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• pp.208-213
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• 2016

In order to detect the exact position of high-speed train, it is necessary to obtain location information from the transponder tag installed along the track. When the transponder tag receives the energizing signal from the train, it sends a telegram to the reader, which includes location information. In high-speed railway environment, this telegram can be corrupted by electromagnetic interference caused by onboard electric train power equipments or wayside devices. In order to assess the performance of transponder system under this harsh environment, we carried out field test using HEMU-430X. Field test results are briefly introduced and discussed for the evaluation of the transponder system under development.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.846-851
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• 2007

The contact and messenger wire is important parts in the electric power system of the railroad. There are so many measurement method like voltage, current, scratch of surface, and glow longer of length. In this paper suggest real time monitering system of messenger wire so called RTU (Remote Terminal Unit) and this system includes CDMA module to transfer real time or saved data of memory to the end user directly who is in the long distance. The hyper terminal program of windows shows the downloaded data from RTU through CDMA communication and this data can be transferred to excel sheet easily.

• 대한기계학회논문집
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• 제16권8호
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• pp.1438-1445
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• 1992

본 연구에서는 그린(green)의 함수를 사용한 가선-판토그래프 계 운동 해석 방법을 개발하였다. 이 방법은 집중질량 방법이나 모우드 해석법에 비하여 더욱 해 석적이며, 모우드 해석법과는 달리 고유 진동수나 진동형의 계산이 필요하지 않다.

• 한국전기전자재료학회논문지
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• 제16권12S호
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• pp.1210-1216
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• 2003

Recently, as the road capacity reaches the limit and environmental problems becomes serious, there is gradually increased a need for railroad vehicles that are environment-friendly and have time regularity, reliability, and safety. Accordingly, in addition to conventional railroad vehicles, lots of vehicles are being newly developed. We developed the hardware and software of the measurement system for on-line test and evaluation of korean high speed train. The software controls the hardware of the measurement system and acts as interface between users and the system hardware. In this paper, practical experiment are performed to verify mechanical performance of motor and main transformer for Korean high speed rail. The experimental test carried out by using new temperature measurement method and verify the temperature performance of motor and transformer is verified.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.940-945
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• 2009

This paper presents the design method of low order controller for the active pantograph of electric train system. The pantograph is the most playa role to supply constant current to the train. The design objectives are to have good tracking performance about reference contact force despite the stiffness variation that is like sinusoidal function concerned in train speed or span length of contact wire. In this paper, we consider stiffness variation from external disturbance of active pantograph to simplify model equation, and propose simple second-order controller which is designed by Characteristic ratio assignment(CRA) control method. Finally, we verify time response appling to model equation of real system and frequency response about parameter uncertainty like stiffness variation. it is performed by Matlab version 6.5 and Matlab simulink simulation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1008-1013
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• 2008

Currently, the use of the subway system as a public transportation has been an increasing demand due to the complex transportation structure in Korea. The subway system provides on time arrival and departure, relatively comfortable riding, and convenient access in the metropolitan area. Among several areas of the operation of the subway system, the safety of subway vehicle itself is of important because the rolling stocks carry the passengers, and the safety and reliability of rolling stocks are directly affected for the safety of subway passengers. In this research, various advanced engineering analysis techniques for the precision diagnosis assessment of subway EMUs have been introduced and the diagnosis assessment results have been used to provide the critical information for the lifetime assessment of EMUs.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.900-907
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• 2008

All electric trains in the city should be run without any troubles of the equipments in order to offer good services to the passengers. But some breakdowns occur when they are operated due to the long time uses. There are mechanical troubles and electrical troubles included reactors. Most of them, the reason of the troubles can be found out easily after breakdown. But it is difficult to find out the reasons of the reactor troubles which disappear after operation. The reactors of the train filter the current which supplied from electrical lines and supply the current to the inverter and block the ripple of the current. Partial discharge occur from the reactor by the heat. accordingly, If the signals of discharge were perceived, it could be anticipate the deterioration degree of insulation. In this paper, on-monitoring system for reactor's troubles in trains is established and the output results of monitoring system are investigated.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.713-720
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• 2009

The development goals of the next generation EMU are to improve the system maintainability, transportation capacity, reliability, passenger service and energy efficiency. In this paper, we propose a measurement scheme for the development goals of the next generation Electric Multiple Unit(EMU). To achieve that, we drew meaningful characteristics for each development goal, which mainly affect effectiveness and performance of vehicle system. Finally, the measurement scheme for the development is obtained by using the characteristics, which could be a numerical values such as maximum velocity, acceleration of the vehicle and so on or subjective values such as a results of surveys from passengers and so on. We expect the proposed measurement scheme will be used to measure the development goals of other similar system as well as the next generation EMU.