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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 8, Issue 6 - Dec 2005
Volume 8, Issue 5 - Oct 2005
Volume 8, Issue 4 - Aug 2005
Volume 8, Issue 3 - Jun 2005
Volume 8, Issue 2 - Apr 2005
Volume 8, Issue 1 - Feb 2005
Selecting the target year
Properties and Application of Y-Steel Sleeper in Track-Laying
Kang Bo-Soon ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 203~209
Y-form steel sleeper are currently enjoying a renaissance in Germany. Their use on ballast track proves hat-especially under extreme conditions and loads-they reliably help ensure high stability and a long service life of the track. In addition to conventional partly mechanised tracklaying methods, a new Method has been developed that for the first time enables Y-form sleepers to be laid on an assembly-line basis at a fast rate and with high quality.
Static and Dynamic Fracture Toughness of Wheelset for High Speed Train
Kwon Seok-Jin ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 210~215
The safety evaluations of railway wheelsets make use of the static fracture toughness obtained in ingot materials. The static fracture toughness of wheelset materials has been extensively studied by experiments, but the dynamic fracture toughness with respect to wheelset materials has not been studied enough yet. It is necessary to evaluate the characteristics of the fracture mechanics depending on each location for a full-scale wheelset for high-speed trains, because the load state for each location of the wheelset while running is different the contact load between the wheel and rail, cyclic stress in the wheel plate, etc. This paper deals with the fracture toughness depend on load rates. The fracture toughness depending on load rate data shows that once the downward curve from quasi-static values was reached, subsequent values showed a slow increase with respect to the impact velocity. This means that dynamic fracture toughness should be considered in the design code of the wheelset material.
Anti-Slip Control and Speed Sensor-less Vector Control of the Railway Vehicle
Jho Jeong-Min ; Kim Gil-Dong ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 216~221
In electric motor coaches, the rolling stocks move by the adhesive effort between rail and driving wheel. Generally, the adhesive effort is defined by the function of both the wright of electric motor coach and the adhesive effort between rails and driving wheel. The characteristics of adhesive effort is strongly affected by the conditions between rails and driving wheel. When the adhesive effort decreases suddenly, the electric motor coach has slip phenomena. This paper proposes a re-adhesion control based on disturbance observer and sensor-less vector control. The numerical simulation and experimental results point out that the proposed re-adhesion control system has the desired driving wheel torque response for the tested bogie system of electric coach. Based on this estimated adhesive effort, the re-adhesion control is performed to obtain the maximum transfer of the tractive effort.
A study on the Mechanical Properties of the Braking Disk due to the Temperature Change(I)
Kim Jae-Hoon ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 222~227
This study investigates the change of the temperature and mechanical properties of the braking disk for the railway vehicle. The average temperature is measured about
and the maximum temperature is measured over
by non-contact sensor from Seoul to Chun-an. As a result of measuring, we determine the temperature of test(tensile and J-integral) at
. In the test, the material values are decreased by the increasing of the temperature. But ratio of decreasing is the largest at
, the tensile test value is decreased about
and the J-integral test value is decreased
. The mechanical properties of this material are mostly changed at
Dynamic Behavior of Plate Girder Railway Bridges using the Finite Element Code
Oh Ji-Taek ; Song Jae-Pil ; Kim Ki-Bong ; Kim Hyun-Ho ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 228~234
Investigation on the dynamic behavior of railway bridges has not performed widely to date except high-speed railway bridges. In this study, 3-dimensional model is used for the finite element analysis of plate girder railway bridges. Train loads obtained through statistical approach of the measured true train loads are used. Numerical analysis is carried out about a 18m-span bridge. This result is compared with that of the experimental test of existing plate gilder railway bridge without ballast. The good agreement was obtained through the comparison. Judging from the analysis, resonant speed of diesel locomotive train is about 120km/h. However, the resonance for the other train is not found from the analysis.
An Analysis of Track Access Charging Systems of European Countries and Recommendation of Policy Directions for Domestic Track Access Charging System
Mun Jin-Su ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 235~243
Following the rail reform in 2004, rail industry in Korea has separated into two parts: one is the infrastructure manager and the other is train operator. Amongst many aspects, track access charging system is one of the imminent aspects to be studied closely to make the rail reform successful. In this study, track access charging systems of European countries are closely investigated and compared one another and lessons learnt from their experiences are derived. Finally, policy directions regarding the track access charging system to be adopted in Korea are suggested.
Train Tracking System Using Phase Difference of Arrival
Chung Sang-ki ; Cho Hong-Shik ; Kim Yeon-Su ; Jeong Rag-Gyo ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 244~252
Accurate and reliable tracking of train is essential for a train control system. The fixed block system which utilizes the track circuit has been used widely for detecting train position. As an alternative, the moving block system has the advantage over the fixed block system since it enables shorter headway and easier maintenance. This paper presents a new technique for the train tracking system which uses radio signal for the train position detection. The proposed algorithm uses the phase difference of arrival of radio signal for the detection of train position. Experimental verification of the algorithm is presented in the paper.
On Study the Safety Diagnosis of Carbody Structure for Crashed Electric Multiple Units
Bae Dae-Sung ; Park Geun-Soo ; Chung Jong-Duk ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 253~259
This paper describes 3D Dimensional Measurement(EDM testing) and tensile testing results of carbody structure for crashed EMU(Electric Multiple Units). Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the crashed EMU. And Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The testing results have been used to provide the critical information for the criteria of safety diagnosis.
Life-Cost-Cycle Evaluation Analysis of the Shunting Locomotive
Bae Dae-Sung ; Chung Jong-Duk ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 260~266
The deterioration of a shunting locomotive was characterized for the lifetime assessment. The locomotive has been used for shunting works in steel making processes, and in this investigation, various types of technical evaluation methods for the locomotive parts were employed to assess the current deterioration status and to provide important clue for lifetime prediction. Unlike other rolling stocks in railway applications, the diesel shunting locomotive is composed of major components such as diesel engine, transmission, gear box, brake system, electronic devices, etc., which cover more than 70 percent of the total price of the locomotive. Therefore, in this paper, each part of major components in the diesel locomotive was analyzed in terms of the degree of deterioration. The lift-cycle-cost (LCC) analysis was performed based on the maintenance and repair history as compared with economical cost to provide the cost-effective prediction, i.e., to assess either repair for reuse or putting the locomotive out of service based on cost-effective calculation.
Optimum Design of Prestressed Concrete Girder Railway Bridge
Lee Jong-Min ; Seo Dong-Joo ; Lee Tae-Gyun ; Lee Joung-Sun ; Cho Sun-Kyu ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 267~275
Prestressed concrete girder(PSC girder) bridges have been used widely at the railway as well as highway because they are great in the functional and economical efficiency. Also they have the advantage of convenience of design and construction. However it could be easily verified that the section of PSC girder is excessive design, which has much redundancy against design loads. Thus, in this paper the formulation of the optimum design for PSC girder railway bridge is suggested and dominant design variables and constraints are inquired as performing the optimum design. In order to effective optimum design, design variables are formulated as PSC girder sectional dimension and girder space. The objective is adopted as total cost of PSC girder railway bridge. Also, constraints are formulated according to Korean railway design specification and considering construction-ability such as PS anchorage and girder space. Using the proposed optimum design system, optimum PSC girder railway bridge design has been performed. And from the results of analysis it is suggested to denote the optimum section which satisfies the structural safety and economical efficiency all together,
Variation of Rail's Axial Compressive Force on Railway Bridges Due to Thermal and Seismic Loads with using EQS Bearings
Kim Lee Hyeon ; Kim Haksoo ; Choi Eunsoo ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 276~285
This study discussed the effect on rail's axial force due to thermal and seismic loads according to supporting conditions of railway bridges; the considered supporting conditions are 1)simply supported, 2)roller at both ends, and 3)roller with horizontal spring at both ends. Closed form solutions are used to calculate the axial farces on rails. The roller at both ends of a bridge span decreases the compressive axial force on rail due to thermal load compared with the simply supported condition. However, the lateral springs at roller are not helpful to decrease the rail's compressive axial force.
Dependability Management System's Application to Subway Corporation
Ha Chen-Soo ; Hong Soon-Ki ; Lee Ho-Yong ; Han Seok-Youn ;
Journal of the Korean Society for Railway, volume 8, issue 3, 2005, Pages 286~292
In this paper, we introduce IEC 60300(Dependability program management) into urban transit system, and propose effective method to apply IEC 60300 to Subway Corporation. The dependability is the collective term used to describe the availability performance and its influencing factors such as reliability performance, maintainability performance and maintenance support performance. A dependability program covers all phases of a system's life cycle from planning to operation and possibly disposal, and is composed of program elements divided into tasks.