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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
Crack Behavior of RC Structures under High Cycle Loading
Kang Bo-Soon ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 495~499
Fatigue behavior of reinforced concrete(RC) elements has been experimentally and analytical investigated. Fatigue behavior is influenced by a longitudinal reinforcement ratio, strength of concrete and a load ratio Pu/Po. The purpose of this study to propose an empirical formula for the fatigue behavior on the basis of experimental results. Also an analytical method to predict the crack propagation of RC beams has been developed based on the relationships between bond stress and slip.
The Study for Design of Tilting Mechanism and Guide Track of Pantograph for Tilting Train
Kim Nam-Po ; Han Seong-Ho ; Ko Tae-Hwan ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 500~506
The development of tilting train has been required for speed-up on the conventional electric railroad due to the characteristic of Korean railroad with a lot of curve track. The study and development of a tilting system and a tilting bogie which have a different mechanism with high speed train will play a important role for enhancement of technology for Korean railway. The study for tilting pantograph mechanism to decrease the displacement between a catenary and a center of pantograph happened when the carbody is tilted in order to maintain the ride comfort and stability m a curving track is proceeding with the development of tilting train. In this paper, we introduce the design concept for the tilting mechanism of pantograph and the role and characteristics for several devices adopted in the tilting mechanism of pantograph. Through the kinematic analysis of tilting mechanism, we will obtain and calculate the optimal tilting angular velocity and acceleration in order to keep the contact behavior of a pantograph and a catenary according to tilting of a carbody.
KTX Impact on Train Operation Pattern ; An Empirical Analysis
Lee Jin-Sun ; Kim Kyoung-Tae ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 507~512
Railroad transportation system has experienced major changes due to KTX introduction. Kyungbu corridor especially Seoul to Cheonan has line capacity problem and its solution has been a primary concern to researchers and policy decision makers. This study explored pattern of train operation between Seoul and Cheonan after the introduction of KTX in 2004. Both the number of trains and available seat capacity per day have increased but maximum number of trains per specific hour has not been changed much. Demand for train shows that if concentrated in a specific time, so number of trains during the peak hour should be increased. But, it is difficult ? 새 line capacity, so increasing seat capacity per train might be an option. An increase in an avaliable sear should be considered the characteristics of each train lines.
Numerical Study of Tunnel Hood to Reduce Micro-Pressure Wave on Conventional Railways
Kim Byeong-Yeol ; Kwon Hyeok-Bin ; Yun Su-Hwan ; Ku Yo-Cheon ; Ko Tae-Hwan ; Lee Dong-Ho ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 513~519
The Korean Tilting Train eXpress may produced a strong micro-pressure wave in tunnel exit because of large train/tunnel area ration of conventional railways. This micro-pressure wave causes an impulsive noise which is a serious environmental noise pollution near tunnel exit. Tunnel hood can be the method of reducing the micro-pressure wave in tunnel exit. Therefore, parametric studies for tunnel hood are performed with respect to the hood length and size to investigate the effects of the tunnel hood. Also, axi-symmetric unsteady compressible flow solver was used to analyze train-tunnel relative motion. According to the result of numerical analysis, the maximum micro-pressure wave in tunnel exit is reduced by 56% throughout the hood establishment on conventional railways.
Environmental Impact Assessment of the Carbody of a Electric Motor Unit(EMU) Using Simplified Life Cycle Assessment(S-LCA)
Lee Jae-Young ; Mok Jai-Kyun ; Jeong In-Tae ; Kim Yong-Ki ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 520~524
It is consequential to reduce the environmental impact of a product for sustainable development in 21st Century. In the field of transportation, especially, the technological market concerned about reduction and assessment of greenhouse gas emission is expected to be extended. The LCA gas been esteemed and utilized as a realistic alternative greenhouse gas emission is expected to be extended. The LCA has been esteemed and utilized as a realistic alternative to improve the environment by the assessment of environmental impacts. In this study, simplified life cycle assessment(S-LCA), was performed to analyze the environmental impacts quantitatively, which were produced through the life cycle of a electric motor unit(EMU). The object of the present work is rth investigate main parameters of environmental impacts and to establish the plans to improve the environment impact of EMU. As a result of quantitative assessment for environmental impact and manufacturing, the EMU carbody made of SUS showed acidification(AD) and marine water aquatic ecotoxicity(MAET) the most, while that made of Mild showed high impact of global warning(GW) and abiotic resources depletion(ARD). For the SUS EMU, the high AD and MAET impact is occurred by the discharged pollutants during acid-washing process. Also, high value of GW and ARD for Mild EMU is resulted from the consumption of iron ore, coal and crude oil during manufacturing. Therefore, the environment impact of carbody would be decreased by enhancing of energy efficiency and the lightening the weight of it.
Prediction on Fatigue Life of Messenger Wire with Service Environments
Chang Seky ; Kim Yong-Ki ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 525~532
Fatigue life of catenary wires in various environments is reduced when stress is concentrated on some points, which are often found in corroded areas by surrounding pollutants. Therefore, the fatigue test were performed in order to investigate the effect of the surface corrosion on the destructive behavior in service environment and accelerated corrosion environment as well as th examine the corrosive property and mechanism of the catenary wires. In the fatigue test of the messenger stranded wire, the corrosion degraded materials showed 35~50% of fatigue life at a same stress amplitude compared to original material. Because the catenary wires have variable load by the interaction of periodic contacts with pantographs the maximum stresses of trolley wire and messenger wire calculated by simulation at the messenger wire during operation was estimated thought the corrosion behavior interpretation of variable stress and fatigue test.
A Study on the Hazard Identification and Risk Mitigation for ATSRX Using Hazard and Operability Study
LEE Jun-Ho ; LEE Kang-Mi ; KIM Yong-Kyu ; SHIN Ducko ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 533~538
In this paper we identity the hazard using HAZOP study for ATSRX which is a subsystem of the ATP system, and we study a safety management method for the mitigation of the risk to the acceptable level. ATSRX is a device that make a train which has a ATP system operate in ATS line. For this ATSRX send a induction signal with ATS system to vehicle controller. Thus ATSRX can be said a safety equipment that makes a train operate safely. In order to identify the hazard for the internal faults in ATSRX system, we employ HAZOP study method which is recommended as hazard identification in IEC 62278, RAMS requirements in railway signal, and also it provide the detail activity in IEC 61882. Thus, in this paper we perform HAZOP study based on ATSRX related standards and using the assessment of the identified hazard we study a method to guarantee the system safety through the change of the design to mitigate the risk to the acceptable level.
Extended Generic BOM for Urban Transit
Park Kee-Jun ; Chung Jong-Duk ; Ahn Tae-Ki ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 539~543
This paper proposed the EGBOM, Extended Generic BOM, which is more flexible BOM system than GBOM. The GBOM system has the limitation to construct Result BOM and to select options by choosing only one Variant under given Cluster. In order to overcome this limitation, we propose the EGBOM which can make more various Result EGBOM, which can use to rolling stock through constructing urban transit BOM using the proposed EGBOM. The last, this paper describes the various Result BOM examples constructed from Source BOM of UT_EGBOM, such as rolling-stock maintenance BOM, individual car BOM, etc.
The Optimal Maintenance Strategy of a Rail Bridge by Using Life Cycle Cost
Yang Seung-le ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 544~549
Nowadays, most of bridge networks are complete or close to completion. The biggest challenge railroad./highway agencies and departments of transportation face is the maintenance of these networks, keeping them safe and serviceable, with limited funds. To maintain the bridges effectively, there is an urgent need to predict their remaining life from a system reliability viewpoint. And, it is necessary to develop the maintenance models based on system reliability concept. In this paper, maintenance models are developed for preventive maintenance and essential maintenance by using system reliability and lifetime distributions. The proposed model is applied to an existing railroad bridge. The optimal maintenance strategy of this bridge is obtained in terms of services life extension and cumulative maintenance cost.
Performance evaluation of Conventional Curved Track by Tilting Trains
Eum Ki-Yung ; Yamg Sin-Chu ; Sin Sung-Kyun ; Um Ju-Hwan ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 550~558
The track performance evaluation in curves of conventional line subjected to loading condition caused by tilting trains was carried out. And the correlations between train speed and track alignment was reviewed. The parameters of track alignment were determined by field investigation of all curves in conventional line. It was founded that the pressure of the rail did exceed the allowable stress when the tilting train speed was over 96km/hr in radius of 300m. As the radius of curvature is smaller, applied force on the track becomes larger in the curved track without regard to laying of the continuos welded rail. On the while, the change of applied force on the track corresponding to the change of the cant is not so large.
Stereoscopic Video Coding for Subway Accident Monitoring System
Kim Gil-Dong ; Park Sung-Hyuk ; Lee Hanmin ; Oh Seh-Chan ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 559~565
In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed designed for providing flexible video among various displays, such ass control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC coding scheme predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service, we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. The experimental results show the efficiency of proposed coding scheme by comparison with already known methods and the advantages of disparity estimation in terms of scalability overhead. According to the experimental results, we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.
A study on the Structural Analysis and Loading Test of Bogie Frame
Kim Won-kyung ; Yoon Sung-Cheol ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 566~572
This paper describes the results of structural analysis and loading test of a bogie frame. The purpose of the analysis and test is to evaluate the safety and functionality of the bogie frame under maximum load. The bogie system consist of the bogie frame, suspensions, wheel-sets, a brake system and a transmission system. Of these components, the bogie frame is the major components subjected to the vehicle and passenger loads. The evaluation method used the JIS E 4207 specifications throughout the FEM analysis and static load test. The test results have shown the bogie frame to be safe and stable under design load conditions.
Evaluation of Mode I Interlaminar Fracture Toughness for Carbon Fabric/Expocy Composite for Tilting Train Carbody
Heo KWang-Su ; Kim Jeong-Seok ; Yoon Sung-Ho ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 573~580
Model I interlaminar fracture behaviors of the carbon/epoxy composite, one of the candidate composites for a tilting train carbody, were investigate by the use of DCB(Double cantilever beam) specimens. These specimens were made of CF3327 plain woven fabric with epoxy resin, and an artificial starter delamination was fabricated by inserting Teflon film with the thickness of
at the one end of the specimen. Mode I interlaminar fracture toughness was evaluated for the specimens with the different thickness of an inserter. Also delamination propagating behaviors and interlaminar fracture surface were examined through an ooptical travelling scope and a scanning electron microscope. We found that abruptly unstable crack propagation called as stick-slip phenomena was observed. In addition, interlaminar fracture behaviors were affected on the location and the morphology of a crack tip as well as an interface region.
Evaluation of environmental impacts for the bogie of electric motor unit(EMU) using simplified life cycle assessment(S-LCA)
Kim Yong-Ki ; Yoon Hee-Teak ; Yang Yun-Hee ; Lee Jae-Young ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 581~585
In this study, the environmental impacts of a bogie in the electric motor unit(EMU) were evaluated quantitatively using simplified life cycle assessment(S_LCA). Target was the bogie and life cycle inventory(LCI) database for the bogie was established. The software used for simplified LCA was PASS. Environmental impacts with the parts of the bogie were dependent on their weight significantly. Among impact categories, abiotic resource depletion(ARD) and global warming(GW) were shown dominantly. Global warming was occurred mainly due to the emission of CO₂released from energy consumption and abiotic resource depletion was caused mostly by the consumption of iron ore for the manufacturing of steel. Therefore, the environmental impacts of the bogie could be reduced by the light-weighting of EMU and the improvement of energy efficiency.
A Study on the Headway of the Personal Rapid Transit System
Shin Ducko ; Kim Yong-Kyu ; Lee Jun-Ho ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 586~591
We deal with the headway which effects on the performance of the PRT(Personal Rapid Transit) system and the system safety. The headway, time between passage of one vehicle and the next, is one of the important factors to assess the line capacity, which has a cue to solve the problem of the congestion in public transportation. To decide the headway there are many important factors, especially such as the failure vehicle deceleration rate, the following simple analytical equation can be made to assess the relation between the line speed and the minimum headway. In this paper we employ a numerical analysis method using a simple analytical equations for the evaluation of the minimum headway and show simple simulation results.
New Electrified Rail Impact on Conventional Railroad ; An Empirical Analysis
Kim Jyoung-Tae ; Lee Jin-Sun ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 592~596
This study analyzed changes of train operation between Seoul~Cheonan after the introduction of new electrified rail in 2005. As expected number of passengers were reduced at specific service section and several railroad stations which were served by the Mugunghwa. Also, the statistic shows that passenter demand concentrated in a specific time, so train service frequency and level of service need to be modified to meet with changed demand pattern. The purpose of this paper is to identify critical demand pattern, especially, in several section of the railroad system. This studies provide a railroad transportation system that is significantly more efficient, with far greater capacity, by providing solutions to the problems of congestion impact.
A study of evaluation reliability growth for Korea-Automated Guideway Transit system
Han Seok-Youn ; Lee Ahn-Ho ; Ha Chen-Soo ; Lee Ho-Yong ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 597~601
Korea Railroad Research Institute(KRRI) developed the Driverless Rubber Tired Korea-AGT(Model: K-AGT) from 1999 to 2004. We have finished the safety and performance tests of K-AGT. Data obtained from this testing can be used to evaluate the growth of reliability. The most widely used traditional growth tracking model is included as IEC International standard. With the tracking model all corrective actions are incorporated during test, called test-fix-test. In the test-fix-test strategy problem modes are found during testing and corrective actions for these problems are incorporated during testing. In this paper, we demonstrated reliability analysis using growth model of driverless rubber tired K-AGT system to prove reliability of development system. Therefore, we introduce the well-known NHPP model and analyze a reliability growth using ReliaSoft's RGA software.
Train-Fleet Assignment based on Public Interests
Oh Seog-Moon ; Son Moo-Sung ; Choi In-Chan ; Choi In-Sang ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 602~609
In this paper, we consider the train-fleet assignment problem to determine fleet assignment and seat allocation synchronously. An integer programming model of the problem and a decomposition-based solution approach are developed to handle short-term period deterministic orgin-destination demands. The primary objective used in the developed model is to maximize the total number of passengers transported during peak load periods, such as Chuseok national holiday period. Thus, in developing the model we choose to profit-pursuing system. We also show how the proposed model can be readily modified to incorporate profit-maximization. Using the empirical data sets provided by a Korean railroad company, we have tested the proposed solution approach and carried out various comparison analyses by varying traffic demand patterns and train schedules. The computational experiments reveal that the proposed solutions approach produces high quality solutions in reasonable computation time.
A study on the Multipurpose Usage of Incheon International Airport Railway - Focusing on the Improvement of Connecting Systems -
Park Jeong-Soo ; Won Jai-Mu ; Han Woo-Jin ;
Journal of the Korean Society for Railway, volume 8, issue 6, 2005, Pages 610~616
The Incheon International Airport Express(I'Rex) is the railroad that connects Incheon International Airport, Gimpo Airport and Seoul Station. I'Rex is now under construction, and it will be connected to Gimpo Airport by 2007, to Seoul Station by 2010. However, there has been no discussion on how th connect different routes of railway Systems. Therefore it seems likely that rail passenger demand will be lower than that of limousine bus. Therefor, this paper proposes 4 effective connecting methods for I'Rex - (1) Shuttle transport, (2) Short-distance connecting transport (Inside I'Rex, Seoul Subway Line 9, 'Han-River line') (3) Mid-distance connecting transport (Jung-ang, Tae-baek, Young-dong line) (4) Long-distance connecting transport (Korean Train Express (Korean high speed railroad)) These methods can increase the connectivity of I'Rex with existing railroads and the competition power of I'Rex against a highway.