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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society for railway
Journal Basic Information
Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 16, Issue 6 - Dec 2013
Volume 16, Issue 5 - Oct 2013
Volume 16, Issue 4 - Aug 2013
Volume 16, Issue 3 - Jun 2013
Volume 16, Issue 2 - Apr 2013
Volume 16, Issue 1 - Feb 2013
Selecting the target year
A Study on Improved Safety and Efficiency of Shunting In View of Principles of Train Operation Safety
Jeon, Young Seok ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 79~84
DOI : 10.7782/JKSR.2013.16.2.079
The definition and classification of shunting, which involves the process of sorting rolling stock into complete train sets inside station yard, are not clearly specified in Korean domestic safety regulations for railway operations. As a result, collisions during shunting occur rather frequently compared with other types of accidents in railway operations. Therefore, new systematic safety principles are proposed in this paper to improve operation safety during shunting. The improvements in safety and efficiency derived from the newly proposed approach are analyzed and verified in field application.
Comparison of Track Vibration Characteristics for Domestic Railway Tracks in the Aspect of Rolling Noise
Ryue, Jungsoo ; Jang, Seungho ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 85~92
DOI : 10.7782/JKSR.2013.16.2.085
An important source of noise from railways is rolling noise caused by wheel and rail vibrations induced by acoustic roughness at the wheel-rail contact. The main contributors to rolling noise are the sleepers, rail, and wheels. In order to analyze and predict rolling noise, it is necessary to understand the vibrating behaviors of railway tracks, as well as of the wheels. In the present paper, theoretical modeling methods for railway track are reviewed in terms of rolling noise; these methods are applied for the three representative types of domestic railway tracks operated: the conventional ballasted track, KTX ballasted track and KTX concrete track. The characteristics of waves propagating along rails are investigated and compared among the types of tracks. The tracks are modeled as discretely supported Timoshenko beams and are compared in terms of the averaged squared amplitude of velocity, which is directly related to the sound radiation from the rails.
Worn Wheel/Rail Contact Simulation and Cultivated Shear Stresses
Noori, Ziaedin ; Shahravi, Majid ; Rezvani, Mohammad Ali ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 93~98
DOI : 10.7782/JKSR.2013.16.2.093
Railway system is today the most efficient way for transportation in many cases in several forms of application. Yet, wear phenomenon, profile evolution, fatigue, fracture, derailment are the major worries (financial and safety) in this system which force significant direct and indirect maintenance costs. To improve the cyclic maintenance procedures and the safety issues, it can be very satisfactory to be informed of the state of wheel/rail interaction with mileage. In present paper, an investigation of the behavior of the shear stresses by logged distance is approached, by implementing the field measurement procedure, in order to determine the real conduct of the most important cause of defects in wheel/rail contact, shear stress. The results coming from a simulation procedure indicate that the amounts of shear stresses are still in high-magnitudes when the wheel and rail are completely worn; even though in simulation based on the laboratory measurements of profile evolutions, the stresses become significantly reduced by logged distance.
Investigation of a Thermal Analysis Method for IPMSM in Railway Vehicles
Park, Chan-Bae ; Lee, Hyung-Woo ; Lee, Byung-Song ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 99~103
DOI : 10.7782/JKSR.2013.16.2.099
In this paper, research on the thermal analysis method is reported for the characterization of heat generation while operating an Interior Permanent Magnet Synchronous Motor (IPMSM) for railway vehicles. Efficient cooling of the heat generated in the IPMSM is important because the excessive heat generated from the winding, core and permanent magnets increases the difficulty of continuously operating an IPMSM over long time periods. Therefore, in this study, in order to analyze the heat generation characteristics of the IPMSM for advanced research in the application of IPMSMs to cooling devices, the heat transfer coefficients for each component of the IPMSM were derived and the thermal equivalent circuit was configured to perform thermal analyses. Finally, the validation of the suggested thermal analysis method was performed through comparison with the heat experimental data of an IPMSM prototype.
Determination of THRs - A Practical Approach for Manufacturers According to EN50129
Weber, Ulrich ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 104~109
DOI : 10.7782/JKSR.2013.16.2.104
The paper will outline how hazard identification and risk evaluation can effectively be performed to obtain Tolerable Hazard Rates (THR). As a target group manufacturers are addressed, who face the situation, that for a generic application THRs are needed for compliance with EN 50129 . Focusing on functional hazards this paper shows a possible hazard log and the relevant analysis methods. The terms safety barrier and barrier function will be introduced and used instead of the term "safety function". As functional hazards and barrier functions depend on each other, emphasis will be put on a comprehensive and detailed definition of barrier functions and the usage of function lists. By using detailed and complete hazard and barrier function definitions THRs can be obtained while at the same time the approach becomes clear how the hazard rates (HR) will be established.
Analysis of the Influence of Track Alignment on Ride Comfort and Safety of KTX
Choi, Il-Yoon ; Um, Ju-Hwan ; Kim, Man-Cheol ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 110~116
DOI : 10.7782/JKSR.2013.16.2.110
Track irregularities is one of the key factors influencing the running behavior of trains. In order to ensure safety and ride comfort of train, the criteria for track irregularities should be adequately established regarding vehicle velocity, vehicle characteristics, characteristics of the track recording car, and measurement interval. Also, track maintenance should be carried out thoroughly according to the criteria for managing track irregularities. Numerical analysis was conducted to investigate the influence of track alignment on the running behavior of Korean high speed train(KTX). Various wavelengths and amplitudes of lateral alignment were considered as parameters for this study using the Vampire program, a vehicle dynamics modeling package in railway environment. Derailment, lateral load, bogie acceleration and body acceleration of numerical analysis results due to alignment were investigated. Finally, the influence of the alignment on safety and ride comfort for the KTX was evaluated. This study indicates that alignment irregularities have significant impacts on running safety, and that the criteria used to manage alignment irregularities should be restrictive to ensure the running safety of the KTX.
Evaluation of Railway Line Segment Deterioration Using AHP and DEA
Kim, Seongho ; Choi, Chan-Yong ; Na, Hee-Seung ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 117~121
DOI : 10.7782/JKSR.2013.16.2.117
Railway line segment deterioration can be affected by rail tracks, subgrades, bridges, tunnels, and line shapes. In this paper, an evaluation method is presented for the railway line segment deterioration using the analytic hierarchy process (AHP) and data envelopment analysis (DEA). The importance weights can be assessed systematically for component facilities from numerous experts using AHP. The importance weights provided by experts may differ according to each expert; however, the DEA enables the evaluation of railway line segment deterioration that reflects the variety of expert opinions using these importance weights.
An Accident Analysis for Reducing Railway Staff Fatalities
Kwak, Sanglog ; Park, Chanwoo ; Wang, Jongbae ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 122~128
DOI : 10.7782/JKSR.2013.16.2.122
As a result of investment in railway safety focusing on passenger safety, the train accident rate has been reduced by half domestically and we have reached a high level of safety compared to other countries and other transportation modes. However, accidents related to staff are still at a high ratio compared to other countries. There have been few studies on staff safety and no relevant systematic safety measures have been implemented. More than 90% of staff fatalities occurred from rolling stock in motion and electrification, which are representative railway accidents. In this study, causes of accidents, and current safety measures for staff are analyzed focusing on trains in motion. The results can be utilized for developing new safety measures.
Comparative Study on the Characteristics of Public Transport Users According to the Types of Transit Station Influence Areas in Seoul's Urban Railway's
Lim, Sam-Jin ; Park, Jun-Tae ; Kim, Tae-Ho ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 129~137
DOI : 10.7782/JKSR.2013.16.2.129
This study This study aims to identify sound developmental directions for transit-oriented development (TOD), which is a topic of interest in the field of urban development, and conducts an empirical analysis of station influence areas within Seoul according to the characteristics of transit types. The results suggest that there are differences among variables that influence demand for public transportation according to transit types. This means that it is necessary to identify improvement plans in developing public transport strategies for the capital region based on such differentiated influence factors and to build foundations to continue to increase demand for public transportation. Also, station influence areas should be developed into hubs by establishing appropriate bus-only lane networks as a supplementary means, rather than directly connecting subway stations with each other.
Management Planning of Gondola Cars through Efficiency Analysis
Kim, Kyoung Tae ; Lee, Suk ; Lee, Young Ho ; Yang, Keun Yul ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 138~143
DOI : 10.7782/JKSR.2013.16.2.138
Recently, the demand for rail freight has gradually decreased. In particular, the demand in Korea for open freight cars, which classification includes gondola cars, hopper cars and gravel cars has been significantly reduced. The role of gondola cars in the rail transportation market shrank to 14.5% in 2010 from 23.3% in 2001. The transportation demand of gondola cars in the long term is expected to be reduced further. Because some gondola cars have been converted to container cars and various containers are being developed to transport bulk cargo by container cars. However, gondola cars still play an important role in rail freight transport. Therefore, the management planning of gondola cars is needed in order to prepare for the long-term declining demand. In this study, we propose a future direction for the management planning of gondola cars through the effectiveness analysis of gondola cars operation.
A Statistical Study on Doorway Flow-time for Designing Doors of Ui LRT
Oh, Suk-Mun ; Jang, Hyeon-Mog ; Shin, Han-Chul ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 144~150
DOI : 10.7782/JKSR.2013.16.2.144
This paper presents an analysis of door design for the Ui LRT based on experiments to predict doorway flow-time and their analyses results. A similar railway vehicle (from Gimhae LRT) and operational conditions are utilized to assess the doorway flow-time through repetitive experiments. Design of the experiments consists of four scenarios, and the experiments are repeated 39 times in total. We use the results of the experiments to verify the design of doors of Ui LRT (e.g. the required number of doors and their width). Various statistical analyses are carried out for the flow-time with respect to the number of boarding/alighting passengers. We make three category levels of boarding/alighting passengers, and analyze the mean and variance for each category, and then carry out One-Way ANOVA to analyze how the number of boarding/alighting and onboard passengers impact flow-time. The results of this paper can be used for making decisions about doors of the LRT vehicle.
A Comparative Study of the Korean and Manchurian Railway Systems during the Japan Colonial Period
Lee, Yongsang ; Chung, Byunghyun ;
Journal of the Korean society for railway, volume 16, issue 2, 2013, Pages 151~162
DOI : 10.7782/JKSR.2013.16.2.151
This paper presents a comparison of Korean and Manchurian railway system during the Japanese colonial era of Korea. While both railways share the common characteristics of an imperial railway, they revealed several differences. Firstly, the Manchurian railway was likely a private company, although it was operated half privately and half by the government. The Manchurian railway operated like the East Indian Company in India during the English colonial era. On the other hand, the Korean railway was fully operated by the government at a ministry level. While the Korean railway solely concentrated on the railway, the Manchurian railway was involved in regional development and the coal-mining industry as well. Secondly, in contrast to the Korean railway, the Manchurian railway was more lucrative, and was relatively more predominant regarding carriage of freights. Thirdly, railway officers in Korea were elected government bureaucrats, while Manchurian railway officers came from diverse political parties and social strata. After the annexation by the Kwantung Army, the Manchurian railway was mainly influenced by the military. The common characteristic here was that both railways were utilized for military purposes as imperial railways. In partilcular, the Manchurian railway executed military orders directly. Hereafter, through a comparative study between the Japanese and Taiwanese railways, a clear and accurate understanding of the characteristics of the Korean railway during the Japanese era will be revealed.