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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 11, Issue 6 - Dec 2008
Volume 11, Issue 5 - Oct 2008
Volume 11, Issue 4 - Aug 2008
Volume 11, Issue 3 - Jun 2008
Volume 11, Issue 2 - Apr 2008
Volume 11, Issue 1 - Feb 2008
Selecting the target year
Development of Environment Assessment Software for Electronic Multiple Unit (EMU)
Kim, Yong-Ki ; Lee, Jae-Young ; Lee, Cheul-Kyu ; Eun, Jong-Hwan ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 211~215
Generally, an EMU (Electronic Multiple Unit) is manufactured by assembling a large number of components and parts with extensive raw materials. Throughout its entire life cycle, much both the complicated system and long operating period. Therefore, it is necessary to the environmental performance of EMUs from raw materials to waste. In this study, RACE (Rail Assessment for Clean Environment) was developed as the software that can analyze the environmental RACE had several LCI (Life Cycle Inventory) database for main components as well as principal materials in EMUs. In the future, RACE can also be used as a tool for environmental communication between manufacturers and operators. Also, we will improve RACE continuously to assess more easily the environment of rolling stocks EMU for user.
Development of Selection Model of Subway Station Influence Area (SIA) in New town using Categorical and Regression Tree (CART)
Kim, Tae-Ho ; Lee, Yong- Taeck ; Hwang, E-Pyo ; Won, Jai-Mu ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 216~224
In general, based on criteria of subway law, radius 500m from subway station is defined as SIA(Subway Station Influence Area). Therefore, in this paper, selection models of SIA are developed to identify appropriate SIA for recently developed 4 new towns based based on CART analysis. As a result, following outputs are obtained; (1) walking distance from subway station is the most influential factor to define SIA (2) SIAs vary with new towns (i.e., bundang city: 856m, ilsan sanbon city 508m, pyungchon city 495m), and (3) walking distance from subway station is influential to land price of SIA. In addition, bundang and pyungchon new town are more affected in land price and walking distance. Therefore, it is desirable for current definition of SIA (radius 500m from subway station) to reflect characteristics of land use and walking distance in the new towns.
Development and Verification of the Steering Algorithm for Articulated Vehicles
Moon, Kyeong-Ho ; Lee, Soo-Ho ; Mok, Jai-Kyun ; Park, Tae-Won ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 225~232
AWS (all wheel steering) is applied to improve the stability and the turning performance. Most automotive cars are mainly controlled by FWS (front wheel steering) system except some cars which are made to improve their stability by using AWS. Articulated vehicles with a pivoting joint for easy turn are difficult to make a sharp turn because of the long body and long wheelbase. Therefore applying AWS to the articulated vehicles is effective to reduce the turning radius. The AWS control method for the articulated vehicles is currently applied to only Phileas vehicles which were developed by APTS. The paper on the design of a controller to guide an articulated vehicle along the path was published but control algorithm for manual driving has not been reported. In the present paper, steering, characteristics of the Phileas vehicles have been analyzed and then new algorithm has been proposed. To verify the AWS algorithm, Commercial S/W, ADAMS was used for validity of the dynamic model and algorithm.
The Study on the Demonstration Test of Quantitative Reliability Requirements for Rolling Stocks
Chung, In-Soo ; Kim, Jong-Woon ; Lee, Kang-Won ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 233~239
It is very important to set a reliability target and verify the requirement when procuring the rolling stock in the aspect of safety, availability and LCC. While there are a few different methods to verify the reliability target, it is required that the most appropriate method should be used considering the characteristics of rolling stock itself and the operation environment. Even though recently the quantitative reliability requirements are widely adopted in domestic market, there is no substantial contents in the various standards and guidelines. In this study we investigate the various reliability demonstration test plans and evaluate them for rolling stock application. And three test plans among them were applied to the real operation data.
A Case Study on Determining Doors Maintenance Intervals through Running Fault Data Analysis for Metro EMU
Lee, Duk-Gyu ; Kim, Jong-Woon ; Lee, Hi-Sung ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 240~247
Recently, railway corporations have built maintenance information systems and collected failure and maintenance data. For example Seoul Metropolitan Rapid Transit Corporation (SMRT) built the Electric Motor Unit-Information System (EMU-IS) which is the first maintenance information system in Korea. It has been operated from August, 2000. This paper deals with a case study on determining maintenance interval through reliability analysis using EMU-IS fault data. Door system is considered for the case study in which reliability is evaluated for operating time and distance and the overhaul interval is determined.
A Study on Causes Generating Induced Noise Voltage on Telecommunications Cables Near to High-speed Rails
Yeo, Sang-Kun ; Park, Chan-Won ; Kim, Chong-Tae ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 248~256
The study aims at verifying no generation of electrical power induced noise voltage on telecommunications lineside cable by analyzing the practical findings of noise voltage produced at the telecommunication lines in the vicinity of electrified high-speed railways like KTX, while proposing to make the current standard measurement circuit along with its measuring conditions revised in compliance with international ITU-T recommendations by identifiably finding out the present problems in balance level measuring instruments as well as their errors in the measurement method now applicable by local telecommunications companies and the Radio Research Laboratory.
Implementation of the Resilient Modulus for the Stiff Cohesive Subgrade Soils on a Numerical Analysis
SaGong, Myung ; Kim, Dae-Hyeon ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 257~262
Design and analysis of road subgrade system, which is exposed to repetitive loading condition, uses resilient modulus. The behavior of railway subgrade system will not be quite different from that of road system. Following this phenomenological feature of the subgrade system, this paper introduces the implementation of the resilient modulus based constitutive model on a commercial finite element software. The implementation of the resilient modulus models such as K-
and Uzan on a FE program has been conducted previously. These model assumes that the material state reaches to the nonlinear elastic condition and with further application of repetitive loads, the response of material is completed in elastic condition. According to the recent test results performed on cohesive subgrade soils, however, permanent deformation occurs with repetitive loads. With aids of previously suggested models the permanent deformation cannot be modeled. To overcome such limitation a plastic potential derived from the test results and simple failure criterion based constitutive model is developed. The comparison between the analysis and test results shows a good correlation.
Principles and Implication of Rail Infrastructure Charging in Advanced Countries
Lim, Chai-Sung ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 263~271
This article considers how the rail track charges of the advanced countries are performed and derived political implication to Korail. In case of North America and Japan, rail track charges are being decided to collect the infrastructure maintenance cost. In European countries, the separation of infrastructure and operation is realized and the railroad track charges are based on MC+ principle. On the other hand, Korail is paying construction cost of KTX as well as maintenance cost in Korea. As for this, railroad reform including rail track charging should be reconsidered.
Rail Grinding Criteria of Kyeong-Bu High-Speed Line for Effective Rail Maintenance
Kim, Man-Cheol ; Kang, Tae-Ku ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 272~279
The importance of maintenance of rail surface defects is increasing more according to the KTX operation. That is because during high speed operation of rolling stock, rail surface defects may cause shortened fatigue life of rail, acceleration of track degradation and reduced ride comfort. The paper was intended to study the establishment of rail grinding criteria of high-speed railway lines considering the KTX operation circumstances. For this, the specimens of UIC 60 rail on Kyeong-Bu high-speed operation lines were collected and they were tested for metallographic structure and measured for the hardness. As the factors affecting RCF causing the defects of rail surface, passing tonnage, running speed and track condition are considered.
Analyses of Fracture Tube Tearing using Gurson Model and Shear Failure Model
Yang, Seung-Yong ; Kwon, Tae-Su ; Choi, Won-Mok ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 280~285
Two kinds of failure model, that is, the Gurson model and a shear failure model were used for the finite element analyses of simple and notch tensile specimens and axial compression of a fracture tube with initial saw-cuts. The parameter values for the shear failure model were determined by a combined experimental and numerical analysis of the notch tensile specimens. After fitting the numerical parameters such as the yielding stress and the fracture shear strains, the Gurson model and the shear failure model were applied to the analysis of the fracture tube. Although the Gurson model and the shear failure model showed similar fracture behavior for the case of the tensile specimens, the respective results were different in the axial force and the crack growth rate of the fracture tube. That is, the shear failure model required more axial force to make the cracks propagate along the tube than the Gurson model. These are believed to show the lack of damage evolution process of the shear failure model. To decide which model is better in the tube analysis, experimental verification will be necessary.
A Study on the Construction of Ground Logistics Base Information System Based on RFID
Kang, Min-Soo ; Son, Young-Il ; Lee, Key-Seo ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 286~293
In this paper, u-FOS system is applied to field test in order to design the code structure based on standards and both 900MHz passive and 2.45GHz active RFID devices were used to test identification capacity in the field tests. For the stable RFID data obtainments, optimum speed of trucks and rail cars and most suitable tagging locations on them were resulted from field tests. The data obtained from ground logistics base and identified through the system is sent to u-FOS. Because the code structure is designed in the form of KKR code structure, this system can be implemented on RFID ODS network without difficulty. Therefore, we suggested the result as a guideline for corporations and government agencies to easily adopt the system.
A Study on Ventilation Effects on Smoke Behavior in Rescue Station for Tunnel Fires
Jang, Won-Cheol ; Kim, Dong-Woon ; Lee, Seong-Hyuk ; Ryou, Hong-Sun ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 294~299
The present study investigates the ventilation effects on smoke spreading with the rescue stations. Experiments for tunnel fires were carried out for n-heptane pool em at different fire locations, and the heat release rates (HRR) were obtained by addition, using the commercial code (FLUENT), the present article presents numerical results for smoke behavior in railway tunnels with rescue station, and it uses the MVHS (Modified Volumetric Heat Source) model for estimation of combustion products resulting from the fire source determined from the HRR measurement. As a result, it is found that smoke propagation is prevented successfully by the fire doors located inside the cross-passages and especially, the smoke behavior in the accident tunnel can be controlled through the ventilation system because of substantial change in smoke flow direction in the cross-passages.
A Study on Conceptual Design for Crashworthiness of the Next Generation High-speed EMU
Kim, Geo-Young ; Cho, Hyun-Jik ; Koo, Jeong-Seo ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 300~310
Through this study, a conceptual design for the next generation high-speed EMU has been derived to meet the crash worthiness requirements of the Korean rollingstock safety regulation. The crashworthiness regulations require some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 km/h, and a collision against a standard deformable obstacle of 15 ton at 110km/h. The complete train set will be composed of 2TC-6M with 13 ton axle load, which is different from KTX with the power car of 17 ton axle load. Using theoretical and numerical analyses, a crashworthy conceptual design was derived in terms of mean crush forces and energy absorptions for principal crushable structures and devices. The derived conceptual design was evaluated and improved using one dimensional dynamic simulations for the bar-spring-damper-mass model. It is shown from the simulation results that the suggested conceptual design can easily satisfy domestic crashworthiness requirements.
Simulation of Ratcheting in Wheel-Rail Contact
Goo, Byeong-Choon ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 311~316
Ratcheting is a cyclic accumulation of strain under a cyclic loading. It is a kind of mechanisms which generate cracks in rail steels. Though some experimental and numerical study has been performed, modeling of ratcheting is still a challenging problem. In this study, an elastic-plastic constitutive equation with non-linear kinematic hardening equation was applied. Contact stresses in wheel-rail were analyzed. Under the tangential stress of the contact stresses, a cyclic stress-strain relation was obtained by using the model. A constant ratcheting strain per cycle was accumulated.
Bending Fatigue Life Assessment of Aged CWR using the Field Test
Park, Yong-Gul ; Sung, Deok-Yong ; Park, Hong-Kee ; Kong, Sun-Yong ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 317~325
As a result of recent research, it is reported that the periodic replacements criterion of rails is able to extend as grinding rail surface and using the continuous welded rail (CWR). This study evaluated correlation between conditions of track and load capacity of rail by analysing the dynamic response of track while the metro train is running. Also, it was converted the measured stress waveform into stress frequency histogram by the rain-flow counting methods, and then accumulated fatigue damage ratio and remaining service life of laid rail were calculated so as the apply the equivalence of stress to S-N curve of a new welded rail. Finally, this study suggests a revision of the periodic replacements criterion of CWR, which was based on accumulated passing tonnage, classified by the types and conditions of track system.
Logicality Estimate for Domestic the Periodic Replacement Criteria of CWR based on Accumulated Passing Tonnage
Park, Yong-Gul ; Suh, Sang-Kyo ; Choi, Jung-Youl ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 326~333
This study is objected by presenting preliminary data to revise the periodic replacement criteria of continuous welded rail (CWR) in using. In this study, it is investigated information resources for foreign standards, the cause and types of damage in welded rails and the track maintenance history of Seoul metro to analysis the correlation between rail failure and accumulated passing tonnage. Also, it is performed bending test for the laid welded rail reaching the periodic replacement criteria. In result, the correlation between rail failure and accumulated passing tonnage is not obvious and it is a lot of cases for the construction error of welded rail. Also, as a result of bending test of laid welded rail, according to reducing about
the bending fracture strength of rail, the laid welded rail reaching the periodic replacement criteria is well enough ensured for the load carrying capacity of rail.
Study on the Appropriateness of Track Maintenance Works through the Evaluation of Trackbed Conditions
Kim, Dae-Sang ; Kwon, Soon-Sup ; Lee, Su-Hyung ; Hwang, Seon-Keun ; Park, Tae-Soon ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 334~341
Ballast track needs maintenance works because it is supported by the compressible trackbed and subgrade layers. Maintenance works are essential to secure riding comfort and extend the life cycle of it. The necessities of maintenance works are determined from track irregularities measured by EM120. Track irregularities is the results of the track deformation. Therefore, it is natural to evaluate the cause of it. This paper focuses on the points the track irregularities come from the trackbed and the subgrade. Nondestructive techniques, such as Ground Penetrating Radar (GPR) and Portable Falling Weight Deflectometer (PFWD) are applied to evaluate the trackbed conditions, ballast layer thickness and vertical track stiffness, in the test section 500m long of Gyungbu line. The trackbed investigation results are compared with the track irregularities measured by EM120 and maintenance works. Conclusively, it was found that some maintenance works were unnecessary on the test section.
A Study on the Improvement of Domestic Rail Safety Management System through the Analysis of Safety Management Regulations and Results of the Universal Rail Safety Audit
Oh, In-Tack ; Paeng, Jung-Goang ; Jang, Seong-Yong ;
Journal of the Korean society for railway, volume 11, issue 3, 2008, Pages 342~348
This paper defines the Safety Management System (SMS) based on the rail safety act and surveys the status of the English rail SMS and International Civil Aviation Organization (ICAO) SMS and OHSAS18001 SMS. Through the analysis of the domestic rail operators' safety management regulations and the results of the universal rail safety audit, the status and problems of domestic rail operators' SMS are investigated and the improvement scheme are derived. First, to establish the continual improvement system for SMS, the instruction which describe the detailed continual improvement method for each steps of SMS including management review by CEO shall be established. Second, to settle the risk management based SMS, converting the rail operators mind and establishing the supply system of safety risk operating model and basic data for the risk analysis and safety evaluation and including the precise requirement for the risk management in the related instruction should be conducted.