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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 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
A Study for Application of Train Information Collection Device using RTD System
Shin, Han-Chul ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 541~545
Because contemporary rolling stock system is complex and highly advanced, and it builds mutual interface, it is necessary to manage maintenance of rolling stock systematically. This study present a case, which shows how to adopt and apply RTD(Remote Transmission Device) integrated to train information collection device. After the train service is complete and the train enters the main subway station, various kinds of information collected from TCMS(Train Control Monitoring System) is transmitted to train depot information collection device through RTD. This study suggests that RTD integrated to train information collection device helps build an effective rolling stock maintenance system by improving reliability of data transmission and cutting maintenance costs.
Evaluation of Behavior of Composite Single Lap Joints with Different Finite Element Models
Kim, Jung-Seok ; Yoon, Hyuk-Jin ; Hwang, Jae-Yeon ; Yoon, Ji-You ; Lee, Seung-Hun ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 546~551
In this paper, the strain distribution of the bond layer has been compared with the experimental data and analyzed according to the different mesh refinements and element types. The mesh density was changed along the longitudinal direction of adherend, the longitudinal direction of overlapped region, the vertical direction of adherend, the vertical direction of adhesive and the width direction of the joint. In addition, the effect of the different types of element was evaluated using soild, shell and plane strain element. The geometric nonlinear analysis was performed to consider the large deformation of the joint. From the numerical result, at least 2 elements were needed to achieve a reliable result as the solid element used. In case of shell element, the peel strain at x/c=1 showed 22.8% error compared with the experiment but the shear strain showed a good agreement with the experiment within 1.67% error.
Analysis of the Frequency Weighting Curve for the Evaluation of Ride Comfort
Kim, Y.G. ; Park, C.K. ; Kim, S.W. ; Kim, K.H. ; Paik, J.S. ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 552~558
Ride comfort of railway vehicles is affected by many factors, such as vibration, noise, smell, temperature, visual stimuli, humidity and a seat design. In general, vibration, which originates from vehicle motion, is considered as the primary concern. In evaluating the ride comfort, relationship between passenger's feeling and vibration characteristics is very important because human feeling is dependent on frequency spectrum of vibration. Therefore, the weighing functions in frequency domain are used to evaluate the ride comfort of railway vehicles. In the present paper, we have analyzed the characteristics of the frequency weighting curves defined in many standards and reviewed the effect resulting from their difference on the ride comfort.
A Study on Power Quality Improvement of Power Conversion System in Centralized-Power Type Electric Railway Vehicle
Kim, Jae-Moon ; Yun, Cha-Jung ; Lee, Eul-Jae ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 559~564
This paper proposes an advanced filter design to improve power quality of a head electric power (HEP) as a power conversion unit in centralized-power type electric railway vehicle. First of all, we have measured waveform of output power of transformer connected HEP to design the filter. Throughout experiment and simulation results, it is estimated that switching technique used HEP is advanced selected harmonic elimination PWM (SHEPWM) and the applied switching frequency is about 300Hz. In this paper, a filter to improve power quality considering estimated parameters is designed. As a result, the reduction of the magnitude of the overall harmonic is achieved and confirmed through simulations.
Network Modeling on Track Circuit and Analysis of Resistance Characteristic on Wood Sleeper
Yoon, In-Mo ; Kim, Min-Seok ; Ko, Young-Hwan ; Lee, Jong-Woo ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 565~569
Sleepers perform bearing rails and are underneath rails. Therefore, the current and voltage of rails are related to the resistance of sleepers. In case that the resistance of sleepers are low, operation problems of relays in tr ack circuits are occur because of flowing leakage current through sleepers. So the condition that the track circuit is always occupied by a train is kept. Currently, the creosote has been used in wood sleepers due to prevention against putrefaction. After a long time, the material is changeable to the chemistry material bases on carbon dioxide or carbon. So, the insulation resistance of wood sleepers is lower than the initial insulation resistance. In case of effecting wood sleepers as conductors, amplitude of the current and voltage on rails is decreased. This phenomenon causes that a train does not receive signals. In this paper, four-network model on the track circuit including the insulation resistance of sleepers is suggested. Also, the standard value of the resistance in straight section is proposed in the wood sleeper.
Modeling of Railway Networks for LRT Test Line Using Petri Nets
Choi, Kwon-Hee ; Song, Joong-Ho ; Choi, Kyu-Hyoung ; Hwang, Hyun-Chyeol ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 570~576
This paper presents the use of the Petri Net Method for modeling railway tracks. The Petri Net is defined as having the characteristics of a parallel, asynchronous, distributed, inconclusive, statistical, etc. information handling system and is a graphical mathematical modeling tool to study the specifics of active movement. It's proven use can be seen at the Korean type Light Rail testing tracks where they modelled the Petri Net method using the train track encasing the segment, track, turnout, and platform as a singular factor and even though two trains either travelling in the same or opposite directions on a single test track equipped with a sidetrack can travel with the guarantee that the two will not collide.
Evaluation of Rail Fatigue Life by Grinding of Kyeong-Bu High-Speed Line
Kim, Man-Cheol ; Choi, Eun-Soo ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 577~582
The importance of maintenance of rail surface defects is increasing according to the KTX operation. That is because during high speed operation of rolling stocks, rail surface defects shorten fatigue life of rail, accelerate track degradation and deteriorate ride comfort. Rail grinding has been applied for effective rail maintenance in Kyeong-Bu HS line. This paper evaluates the effectiveness of rail grinding in term of rail fatigue life. To this end, the stresses of the rail are measured under KTX running and the equivalent stress range is calculated by RMC after the frequency analysis done with rainflow counting method. Also, The Modified Miner's rule is applied to predict the fatigue life of ground rail. The result of the analysis shows that the fatigue life of ground rail is increased by 15%.
Analysis on Safety and Ride Comfort of KTX According to Track Surface
Choi, Il-Yoon ; Koo, Dong-Hoe ; Hwang, Seok-Yeol ; Lim, Yun-Sik ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 583~588
Track irregularities is one of key factors influencing running behavior of train. In order to ensure safety and ride comfort, it is highly important that relationship between track irregularity and running behavior of vehicle is identified and the criteria for track irregularities is adequately established. Numerical analysis was conducted to investigate influence of surface on running behavior of KTX and various wavelength and amplitude of surface were considered in numerical analysis. Derailment, lateral load, bogie acc., body acc. of numerical analysis results were investigated to evaluate the effect on track profile on safety and ride comfort of KTX.
Comparative Study on Ride Comfort and Optimum Horizontal Curve Conditions for Superimposition of Vertical and Horizontal Curve
Um, Ju-Hwan ; Choi, Il-Yoon ; Yang, Sin-Chu ; Lee, Il-Hwa ; Kim, Man-Cheol ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 589~594
Superimposition of horizontal and vertical curves may hamper the ride comfort and running stability of train and largely affect the maintenance costs. However, in many cases, it is not easy to make a track alignment plan because of the geographic conditions or undesirable environmental factors. In this paper, a comparative study on the effect of superimposition of vertical and horizontal curve on the ride comfort and optimum horizontal curve conditions was performed. That is, optimal cant and ride comfort analysis with and without a vertical curve superimposed on the horizontal curve were evaluated. Also the superimposition effect on ride comfort and alignment conditions in high speed zone were evaluated. From the analysis results, it was found that the ride comfort is similar to that at the only horizontal curves when applying the compensation cant for the superimposed site.
Analytic Study of the Level of Introducing Bimodal TRAM System
Eom, Jin-Ki ; Choi, Myoung-Hun ; Sung, Myoung-Joon ; Lee, Jun ; Park, Sang-Min ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 595~600
The Bimodal Tram being developed in Korea is a new transit system that provides both benefits of rail and bus systems in terms of accessibility and fixed time schedule. The Bimodal Tram is expected to take an important role of transit system in Korea under the national strategy of transportation system such as 'Low Carbon and Green Growth' for the next generation. This study does define the key indices considered for a decision of introducing the Bimodal Tram system and develop a finalized index, BSI(Bimodal Score for Introduction), showing the level of Bimodal Tram system introduced at a city level. The transport/transit system varies depending on cities with respect to demographic characteristics, travel patterns, financial capabilities, etc. This study will help any cities where transport agencies are trying to introduce the Bimodal Tram as a new transit system.
Railway Track Maintenance Scheduling using Artificial Bee Colony
Nam, Duk-Hee ; Kim, Ki-Dong ; Lee, Sung-Uk ; Kim, Sung-Soo ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 601~607
The objective of this paper is to propose a fast and easy Binary Artificial Bee Colony (BABC) heuristic algorithm to optimize NP-hard scheduling problem of railway track maintenance considering real conditions. The optimal or best solutions can be found using proposed BABC within very short or user specified computation time. We can greatly maximize the objective value using this proposed method in 30, 60, 100 and 200 work size railway track maintenance scheduling problems for experiment and analysis.
The Analysis on the Effects of the Failure Reduction Strategies of the Railway Facilities
Yun, Seong-Chan ; Park, Jong-Hun ; Kim, Sung-Chun ; Eum, Sung-Jik ;
Journal of the Korean Society for Railway, volume 13, issue 6, 2010, Pages 608~616
Seoul Metropolitan Rapid Transit Corporation, managing the line number 5,6,7 and 8 has inspected and maintained for the maintenance of the facilities spread in the extended 152km and 148 stations. Despite the thorough inspection for prevention of the facility failure, the failure has continuously occurred, due to the environmental factors of the underground, mechanical worn-out caused by frequent use, aging facilities, system error, negligence on use, etc. We have achieved a 53.4% reduction in the number of failure by the end of June, 2010 by breaking the conventional way of inspections and maintenance and by adopting quantitative goal management and new way of work. In this paper, we will analyze the problems of inspections and maintenance of the railway facilities, the failure reduction strategy and the performance of each strategy.