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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Railway
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Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
Study on Improving the Environmental Performance of a Railway Vehicle through a Life Cycle Assessment of the Tilting Train
Lee, Cheul Kyu ; Kim, Yong-Ki ; Lee, Jae-Young ; Choi, Yo-Han ; Kim, Cho-Young ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 1~6
DOI : 10.7782/JKSR.2014.17.1.1
Recent international environmental regulations are focused on reducing pre-contamination and on sustainable development prior to the usage stage of a product. The Environmental Performance Declaration is being used as a tool for quantifying the environmental performance of products, to reduce contamination in advance, and for advertising the results of railway vehicles in Europe. In this study, a life cycle assessment of the tilting train was conducted, the first such case study in Korea, according to the ISO 14025 standard and Korea EDP (Environmental Declaration of the Product) rule. As a result of the LCA, the life cycle carbon emission of the tilting train was determined to be
which is higher than that of a European train. Also, the amount of
emission of the Mcp and car body is higher than that of the other car and bogie.
Analysis of the Major Design Parameters of a Pantograph-Railway Catenary System for Improving the Current Collection Quality
Cho, Yong Hyeon ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 7~13
DOI : 10.7782/JKSR.2014.17.1.7
Stiffness variations and wave propagation/reflection in railway catenaries are the primary sources of contact loss between a pantograph and a railway contact wire. This paper analyzes which design parameter is more important for 200km/h conventional rail and 300km/h high-speed rail, in order to effectively reduce the contact loss. For the high-speed rail, the wave propagation and reflection in the overhead contact lines are more influential than the stiffness variation over a span. When the high-speed rail needs to speed-up, it is necessary to develop higher strength contact wires in order to increase the wave propagation speed. In addition, the dropper clamp mass should be reduced in order to alleviate the wave reflection. However, it is noted that the increase in the tension to a messenger wire could deteriorate the current collection quality, which contrasts with expectations. For the 200km/h conventional rail, the stiffness variation over a span is more influential than the wave propagation and reflection. Therefore, shortening span length, increasing the tension in the contact wire and optimizing the location of the droppers are recommended for a smoother stiffness variation over the span.
Wheel/Rail Contact Analysis with Consideration of Friction and Torque
Song, Ki-Seok ; Han, Seung-Hee ; Choi, Yeon-Sun ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 14~18
DOI : 10.7782/JKSR.2014.17.1.14
Wheel/rail contact is a significant problem in railway dynamics. In this paper, the wheel/rail contact is examined analytically and numerically as a contact problem between two cylinders where torque and friction have effect. Furthermore, the contact of a real wheel and rail is investigated numerically where the normal and shear force act. This study demonstrates that the wheel/rail contact is a process that generates traction force through creep where rolling and sliding occurs simultaneously depending on the shape of the wheel and rail, and the friction coefficient between them.
Optimization of Characteristics of Longitudinal Creepage for Running Stability on Sharp Curved Track
Sim, Kyung-Seok ; Park, Tae-Won ; Lee, Jin-Hee ; Kim, Nam-Po ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 19~27
DOI : 10.7782/JKSR.2014.17.1.19
Urban railway vehicles operate in downtown areas. Due to increases in the number of passengers and changes in the service plans, railway vehicles are expected to operate on sharp curved tracks. However, on these tracks, the running stability of the railway vehicles is significantly decreased and the creepage is increased. Creepage causes the wheel/rail to wear and vibration. Therefore, reducing the creepage helps ensure the running stability and can be beneficial for the environment and cost. In this paper, the longitudinal creepage is analyzed using a railway vehicle model on a sharp curved track. Furthermore, in order to minimize the problems when a railway vehicle runs on a sharp curved track, the characteristics of a bogie are optimized using response optimization.
Analysis of Dynamic Characteristics for Concept Design of Independent-Wheel Type Ultra-High-Speed Train
Lee, Jin-Hee ; Kim, Nam-Po ; Sim, Kyung-Seok ; Park, Tae-Won ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 28~34
DOI : 10.7782/JKSR.2014.17.1.28
In this paper, a concept design of a rail type ultra-high-speed train is proposed and its dynamic characteristics are analyzed. Instead of the existing solid axle, a new type bogie system and independently rotating wheels are applied in the proposed train. In order to analyze the dynamic characteristics, a multibody dynamic model of a vehicle is developed and the basic validity is verified by eigenvalue analysis. Also, it is shown that the critical speed is improved in comparison to that of existing high-speed train model HEMU-430X. Finally, through 7000R curved track driving analysis at a speed of 550 km/h, the lateral force of the wheels and the derailment quotient are estimated and the applicability of the new concept railway vehicle is confirmed.
Investigation of Radio Communications-based Train Control System with Interoperability
Choi, June-Young ; Park, Jae-Young ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 35~42
DOI : 10.7782/JKSR.2014.17.1.35
This paper analyzes the hazard related to train control, the functional requirements for atrain control system(TCS) and the automatic train protection(ATP) functional allocation that ensures the interoperability of a radio communications-based TCS. In addition, the interoperability can be obtained using wireless communications technology standards and standardized functional allocations of TCS performed on the wayside and onboard. Using this information, an integrated operating system for a rail network can be constructed. The functional allocations of TCS that support interoperability, require hazard analysis of TCS and definition of the system requirements. The hazard factors for a TCS are confirmed through setting the train safety space control and train speed limit excess. Furthermore, this paper determines the impact of the hazard factors on the TCS and, defines the functional requirements for the TCS subsystems and the ATP wayside and onboard functional allocations.
Dynamic Properties for Geomaterials of Railway as Determined by Large-scale Cyclic Triaxial Test
Lee, Sung Jin ; Hwang, Su Beom ; Lee, Su Hyung ; Lee, Seong Hyeok ; Kim, Ki Jae ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 43~51
DOI : 10.7782/JKSR.2014.17.1.43
In the earth structures of railways, large coarse granular materials are widely used as fill materials. However, experimental studies that consider the dynamic properties of these coarse granular materials have rarely been carried out in Korea due to the lack of a large scale test apparatus in this country. In this study, large scale cyclic triaxial tests were carried out for materials such as reinforced roadbed (subballast, graded crushed stone), transition zone gravel, and the upper subgrade of a railway. These specimens were prepared according to certain conditions (dry unit weight, grain size distribution, and so on) specified in the Korea railroad design standard. Based on these large triaxial test results, normalized shear modulus and damping ratio curves according to small strain level are suggested. A model and coefficients for each material are also proposed.
Prediction of Cumulative Plastic Displacement in the Concrete Track Roadbed Caused by Cyclic Loading
Won, Sang-Soo ; Lee, Jin-Wook ; Lee, Seong-Hyeok ; Jung, Young-Hoon ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 52~58
DOI : 10.7782/JKSR.2014.17.1.52
Plastic deformation of roadbed influences the stability and maintenance of concrete slab track. Long-term plastic deformation in a railway roadbed is generated primarily due to accumulated inelastic strains caused by repeated passing of trains. Prediction of cumulative plastic deformation is important in cost-effective maintenance of railway tracks as well as for the safe operation of trains. In this study, the vertical displacements in railway roadbeds with different thicknesses of reinforced roadbed were computed. Parameters of the power model for cumulative plastic strain were calibrated by using the data from triaxial tests and full-scale loading tests. Results of three-dimensional finite element analyses of standard roadbed sections provide us with design guidelines for the selection of the thickness of reinforced roadbed.
Development of Intermodal Connectivity Index for High-Speed Rail
Kim, Byung-Kwan ; Ha, Oh-Keun ; Shin, Hyun-Ju ; Kim, Hyoun-Ku ; Wang, Yeon-Dae ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 59~69
DOI : 10.7782/JKSR.2014.17.1.59
Recently, the building of an intermodal transportation system has become the most important policy in the establishment of a national-wide sustainable transport system. In the case of rail and public transport, an intermodal connecting improvement policy is essential due to the lack of trip completeness. In particular, high-speed rail has brought dramatic changes to the transportation system in Korea and the idea of high-speed rail stations as major transportation nodes to be linked to various travel modes needs to be analyzed in terms of an intermodal network. Thus, this study proposes a new connectivity analysis method to objectively and quantitatively evaluate intermodal connecting performance for high-speed rail in terms of an intermodal network around high-speed rail stations. Seoul, Busan, Ulsan, and Sin-gyeongju stations were designated for a range of spatial analyses; detailed connecting performance indexes of travel modes connecting high-speed rail stations, and the influence sphere of these stations are analyzed, except for internal transfer facilities. Finally, this study proposes a connectivity analysis method that applies the structural equation model and develops a connectivity index.
Development and Philosophy in Local Railway Policy: The Experience of Japanese National Railway
Hwang, Young-Jin ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 70~78
DOI : 10.7782/JKSR.2014.17.1.70
Recently, the Korean government is considering a policy of adopting competition in railway transportation, such as the establishment of a subsidiary company to Korail as a company to operate a part of the KTX line, the separation of deficit-running lines of local railways and the opening of railway transportation to private operators. The termination of local railway service, which is a major provider of public transportation, will not only deprive the public of a means of transportation but also lead to a decline in the quality of public transit in general. The termination of local railway service is being decisively affected by the national railway policy. The purpose of this thesis is to clarify local railway policy in Japan by studying the development and philosophy of the local railway policy of the Japanese National Railway (JNR).
Empirical Analysis on Priority Evaluation of Advanced Urban Transit Systems Considering Weights of Public Transportation System Characteristics
Kim, Hyunwoong ; Moon, Daeseop ; Moon, Jungwook ; Kim, Mirye ; Lee, Jinsun ;
Journal of the Korean Society for Railway, volume 17, issue 1, 2014, Pages 79~85
DOI : 10.7782/JKSR.2014.17.1.79
This paper presents an evaluation method that considers the weights of many characteristics of a public transportation system; this method facilitates the selection of suitable advanced transit system in a transportation investment plan. The method sets up twelve evaluation items separated by the following influence factors: users, community, government and operators. It then evaluates the advanced transportation system by analyzing the weights. For an empirical analysis, the urban advanced transportation systems for the main transit of small and medium sized cities were evaluated using the AHP method. The result revealed that the weight order is safety, rapidity and punctuality, convenience, and regional activation, and the priority order is steel wheel-type AGT, LIM, and rubber wheel-type AGT.