• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1-9
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• 2008

A wide metropolitan railway and a metropolitan railway in metropolitan area are transportation systems to cope with possible large demand and are under construction continually. A wide metropolitan railway and a metropolitan railway in metropolitan area are running with low speed because it is difficult to improve train speed according to short distances between stations and topography. There is a few study on improving commercial speed on the existing wide metropolitan railway and metropolitan railway in metropolitan area, but there is no study on a new wide metropolitan railway. This study present speed-up scheme of the Sosa-Wonsi line by enlarging the curve radius, reducing the horizontal steep gradient, reducing the stopping time, speeding up at underground section, and installing the PSD, etc. This scheme is evaluated using the simulation technique.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.423-430
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• 2000

With speed-up of existing railway, a greater attention is paid to the riding safety and the comfort of the passengers. They are combined to some technical factors related to track such as alignment, derailment coefficient, and track bearing capacity, A quantitative analysis method for those technical factors is presented in this study. Calculating the allowable transit speed, the technical reviews of speed-up of Janghang-Line(Chunan∼Janghang) are conducted. And the alternatives for improving train speed in existing railway are proposed.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.645-656
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• 2008

The operation of express train on the Seoul Metropolitan Subway Network is centered on the Kyungbu and Kyungin lines and the short section between Dongducheon station and Ganyung station which is 20.7km long. It is true that the needs of many customers who want to reduce their commuting hours by express train is not satisfied. This paper proposes that the operation of express trains be enlarged to Sungbuk station on Kyungwon line which comes to 34.9 km long, and to Yangsu station from Youngsan station on Jungang line. The type of operation is mixed one with high and low speed trains, which operates express train by use of existing siding tracks without improving facilities such as extra building of sidings. This pragmatic study is to apply the goal of reducing running time as express train and to suggest the selection of appropriate stops, effectivenes analysis of express train operation and formation of train diagrams to actual operation.

• 한국전산유체공학회:학술대회논문집
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• 2004.10a
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• pp.177-180
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• 2004

The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. For development of tilting train, the study and development of the tilting system and tilting bogie having the different mechanism with a general high speed train will play a main role for improving the technology in the field of Korean railway The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In this study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. We also performed the numerical analysis for design the device controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for a device to control the lift force, we will suggest the various shape and the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1673-1679
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• 2009

Korean railroad company is continuously improving the service for the disabled. They also install and reform many facilities for them. However, They didn't consider the egress of the disabled when fire occurred until today. At present, fire hazard analysis and risk assessment are introduced into Korea regulation for improving fire safety performance of train car and railroad facilities. Fire safety evaluation for the railroad conducted in Korea didn't generally consider the disabled. In the present situation, the study for the egress of the disabled in train car was needed. The egress experiment was conducted to measure the movement speed of the disabled who didn't walk or walk very slow.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.456-460
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• 2007

The original conventional railway was designed to be stand against 150km/h and it is still being operated at the present. However, if the speed of train is improved up to 200km/h in the near future in order to get competitiveness, we examined how the speed effect on the rail and we analyzed the effect of vibration, the stress and the displacement of the rail material by the change of the speed and the change of the property of matter through the hydrostatical and the dynamic analysis about the absence of the rail. As the result of the analysis by the above method, we got the prove that the best synthetic hardness of the rail is $75{\pm}10KN/mm$. Therefore, it is proved that rail pad has to be improved.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1624-1626
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• 2004

On the 105th year of the Korean Railroad, Korea railroad is at the advent of the high speed operation with an commercial operation of KTX(Korea Train eXpress), the fifth high speed line in the world, between Pusan and Seoul at the speed of 300km/hr. In order to enhance nation competitiveness in $21^{st}$ century, Korea Railroad is faced with a task of improving the railroad network in the areas of new line constructions, betterment of existing rail lines, increasing the operation speed and transportation capacity and modernization of rolling stock fleet.

• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.692-700
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• 2007

A trial run of locally-developed tilting train has been in process on Chungbuk line since the test vehicle was first produced. For the system stabilization, interface verification among the systems including track, structure, catenary and signaling system, not to mention the rolling stock, is very crucial. In the area of wayside structure, the stability of track structure and train run shall be evaluated through the review of impact by increased speed by developed train on track structure. The study thus was intended to evaluate the impact on track while a tilting train is running the curve section, which is vulnerable to accelerated train speed. The analysis of tilting train test running the part of Chungbuk line and Honam line was conducted to identify the impact on existing track performance by tilting train. To identify the movement behavior of each part of track while tilting train, high speed train and traditional train (Mugunghwa and freight train) were running the existing line, wheel load, lateral wheel load, rail bending stress, vertical and lateral displacement of rail and vertical displacement of sleeper were compared and analyzed so as to evaluate the expected impact by tilting train for improving the train speed.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.467-471
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• 2004

The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. For development of tilting train, the study and development of the tilting system and tilting bogie having the different mechanism with a general high speed train will play a main role for improving the technology in the field of Korean railway. The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In this study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. We also performed the numerical analysis for design the device controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for a device to control the lift force, we will suggest the various shape and the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.905-910
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• 2007

The cubicle of high speed train is the equipment where the important train- operating equipments are concentrated, so it requires the higher safety and reliability than any other equipment. Recently, the power car cubicle of KTX-II is, basically similar to that of KTX-I and HSR350x in its size, but consequently, as more sophisticated ATP/ATC and other parts are added, the order company points out the problem of rising temperature in summer. Especially, the interpretation about the possibility of guaranteeing the minimum freezing performance becomes necessary, when Fan Tray is out of order. This paper presents the method of improving the freezing performance while minimizing the effect of dust, and the method of guaranteeing the present freezing performance by the best arrangement of Fan Tray, when Fan Tray is out of order. And as a method of verifying this, we would like to predict the pressure, speed of a running fluid and temperature distribution of cubicle through the flow analysis.