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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
Editor in Chief :
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
KTX Trainset Maintenance Routing and Allocation System for Korea High-Speed Rail
Hong Soon-Hum ; Kim Seongho ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 391~397
In this paper we present a model for the maintenance routing construction and the trainset allocation (maintenance routing problem). The model solves the maintenance routing problem using column generation algorithm which was used to combine constraint programming and linear programming. Ilog-cplex was used to solve the linear programming model and Ilog-solver was used to solve the constraint programming model. The computational experience is also provided.
An Experimental Study on the Correlation between Span Types and the Contact Force of the Pantograph for High-speed Train
Kim Young-Guk ; Mok Jin-Yong ; Lee Hi-Sung ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 398~404
In this paper, we introduce the on-line test of the current collection characteristics for HSR 350x(Korea High Speed Train project) that have been performed in the Kyoung-bu high-speed line since 2002. Through the analysis of measured data during on-line test, the variation trend of contact force between pantograph and contact wire of catenary according to the span type, the track conditions and driving patterns is reviewed. In order to analyze the variation trend of contact force, we have checked the span type of catenary in KP 24 - 125 out of Kyoung-bu high speed line and obtained the statistical processing result per each span type. This study shows that the track conditions do not affect on the dynamic performance between pantograph and contact wire catenary, and the span type and the driving pattern are important factors in determining the good interaction between them.
Evaluation on the Train Resistances for Korean High Speed Train
Kim Young-Guk ; Kwon Hyeok-Bin ; Kim Seog-Won ; Park Tae-Won ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 405~410
In this paper, the train resistances for HSR-350x(Korean High Speed Train project), which has been obtained by the coast-down test, have been proposed in cases of the open field and tunnel. They are approximated as quadratic functions suggested by the Davis equation. The coast-down simulations for HSR-350x using the estimated train resistances have performed and the results have been compared with those of the same conditions of the coast-down tests. It is concluded that the proposed train resistances can be considered to provide good estimations for HSR-350x. Also, the effects of the infrastructure conditions, such as tracks, curves and tunnels have been reviewed. These results show that the tunnel plays an important role in determining the train resistance but others does not,
Stacking Sequence Optimization of Composite Laminates for Railways Using Expert System
Kim Jung-Seok ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 411~418
This paper expounds the development of a user-friendly expert system for the optimal stacking sequence design of composite laminates subjected to the various rules constraints. The expert system was realized in the graphic-based design environment. Therefore, users can access and use the system easily. The optimal stacking sequence is obtained by means of integration of a genetic algorithm, finite element analysis. These systems were integrated with the rules of design heuristics under an expert system shell. The optimal stacking sequence combination for the application of interest is drawn from the discrete ply angles and design rules stored in the knowledge base of the expert system. For the integration and management of softwares, a graphic-based design environment that provides multi-tasking and graphic user interface capability is built.
Safety Evaluation of Bogie Frame for Tilting Railway Vehicles by Fatigue and Nondestructive Tests
Kim Jung-Seok ; Kim Nam-Po ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 419~424
This paper has performed fatigue and nondestructive test of bogie frame for Korean tilting train. Before the fatigue test, static tests were carried out. From the test, the structural safety was investigated using Goodman diagram. After the static test, the fatigue test were conducted under tilting load conditions. The fatigue test was conducted for
cycles. During the fatigue test, the nondestructive tests using magnetic particle and liquid penetrant were performed at
cycle. From the crack detection tests, it was known that there was no fatigue crack in the bogie frame.
Automation of Fatigue Durability Analysis of Welded Bogie Frame using Process Integration Tool
Bang Je-Sung ; Han Seung-Ho ; Rim Chae-Whan ; Lee Kwang-Ki ; Lee Kwang-Soon ; Song See-Yeob ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 425~433
For the design of welded bogie frame, the concept of multidisciplinary engineering activities, i.e. static, fatigue and dynamic analysis, has been applied, in which the sharing of design parameters related with each analysis and the collaboration of the working parts in charge should be fulfilled. However, in spite of these necessities, the multi-disciplinary engineering activities couldn't be performed in practice due to tack of the automation of the required analysis. In this paper, an automation of fatigue durability analysis of welded bogie frame according to UIC-Code was proposed by using the Model Center, which enables to integrate the several tools for the fatigue durability analysis, i.e. I-DEAS, ANSYS and BFAP, and to perform iterative analysis works in relation to the geometrical change of transom support bracket. Besides, the wrapping programs to control I/O-data and interfaces of these tools were developed. The developed automation technique brings not only significant decreasing man-hour required in the durability analysis, but also providing a platform of the multidisciplinary engineering activities.
Reliability Assessment of Traction System of Korean High Speed Train
Seo Sung-Il ; Park Choon-Soo ; Han Young-Jae ; Lee Tae-Hyung ; Kim Ki-Hwan ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 434~438
In this paper, as the first step to assess and enhance the reliability of Korea High Speed Train, an electric traction system is selected and reliability analysis is carried out. The electric traction system is classified into subsystems and functional block diagrams and reliability block diagrams are drawn. Expressions for evaluating the reliability are derived and Mean Kilometer Between Service Failure is calculated using the trial track test results. The calculation results show reliability growth of the proposed system.
Lifetime Prediction of a P.S.C Rail Road Bridge
Yang Seung-Le ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 439~443
The biggest challenge bridge agencies face is the maintenance of bridges, keeping them safe and serviceable, with limited funds. To maintain the bridges effectively, there is and urgent need to predict their remaining life from a system reliability viewpoint. In this paper, a model using lifetime functions to evaluate the overall system probability of survival of a rail road bridge is proposed. In this model, the rail load bridge is modeled as a system. Using the model, the lifetime of the rail road bridge is predicted.
Analysis of Economical Validity for Implementation of Telematics in Construction Fields
Lee Sung Hyun ; Lee Dong Wook ; Koo Ja Kyung ; Lee Tai Sik ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 444~453
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.
A Study of Tie Shape Effects for Reduction of Underbody Train Gust of High-Speed Train
Kim Jong-Yong ; Kim Tae-Yoon ; Ku Yo-Cheon ; Yun Su-Hwan ; Kwon Hyeok-Bin ; Lee Dong-Ho ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 454~459
In this study, the relationship between tie shape and underbody train gust of high-speed train is numerically investigated. To this end, complex train underbody/railroad model is replaced by simple plate/tie model. And it is tried to find a most important parameter for reduction of underbody train gust through the Taguchi method and orthogonal array. As a result, it is verified that the height of tie is most sensitive to the underbody train gust because of the cavity effect between ties. When the width and distance between ties are decreased, underbody train gust is also reduced. Consequently, the heighter is examined which can give the similar effect of higher tie without replacement of tie. The 5cm heighter can reduce underbody train gust about
, which value is only
less than the higher tie.
Improvement of Turn-key Contract System through the Analysis of Present Ordering Condition in Civil Engineering Projects
Lee Yang-Kyoo ; Kang Leen-Seok ; Park Jong-Hyuk ; Jeon Seong-Chul ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 460~469
Turnkey contract system is an effective ordering system for the ordering organizations that technical engineers are insufficient for their construction projects. It is possible to reduce project duration and to improve project quality in an integrated contract system between design and construction. However, owners can have a difficulty caused from unitary responsibility system. This study analyzes present situation and problems of turnkey contract system including railway projects. The result includes various methods for improving the system based on the analysis of bid price and selection procedure.
A Study on the Application of RCM(Reliability Centered Maintenance) to KTX(Korea Train express)
Lim Byeong-Ok ; Yoon Deok-Gyun ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 470~476
RCM developed by American air industry in early 1960, its process is most realistic for some physical assets and it permits the system to maintain given function status through decision of demand about optimum maintenance. Therefore, many industries have selected RCM technique and have carried out RCM in order to solve many problems concerning maintenance management as improvement of reliability and availability of facilities, removal of hazard element about break down and retrenchment of maintenance cost. Through the execution of RCM, we can solve actual problems. And finally we will be able to develop more and more maintenance activities with RCM notion. In this study, we will consider the application of KTX-RCM which is set up with basic theory of RCM and constructed to improve vehicle safety, availability and regularity of KTX, linking with CMMS(Computerized Maintenance Management System).
A Study on the Wear Characteristics of Wheel Profile for High Speed Rolling-stock
Hur Hyun-Moo ; You Won-Hee ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 477~482
Through a year's commercial operation, Korea High Speed Railway has solved defectives from several breakages at the beginning and is going into the stage of stable operation. Among issues, wheel wear becomes a matter of primary concerns in view of vehicle's stability and maintenance. It was understood as above that wear status has been improved in the test by which railway system including vehicles and tracks was stabilized during a year's commercial operation, comparing to that with excessive wear in the trial operation prior to opening to the public. To make out wheel's wear status and characteristics of equivalent conicity at present when the service has been introduced a year ago and the average cumulative mileage of vehicles reach almost 500,000km, wheel's wear types were analyzed with the current vehicles in service.
A Study on Dynamic Characteristics of the Rolling-stock for the Combination of Domestic Wheel/Rail Profiles
Hur Hyun-Moo ; Seo Jung-Won ; Kwon Seok-Jin ; Kim Nam-Po ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 483~489
Railway wheel/rail contact conditions have influences on dynamic behavior of the rolling stock. If there are incompatibility problems between the wheel and rail, damages like wheel wear, wheel spalling, rail wear, etc are occurred. Especially wheel and rail profiles are important factors of vehicle curving performance, so compatibility studies between wheel and rail profiles have to be carried out preferentially. In this study, we have studied the compatibility between wheel and rail profiles of KNR conventional line to analyze the dynamic performances of the rolling-stock. Thus we showed the results relating to wheel/rail geometric contact, vehicle running performances as the change of wheel/rail combination.
Analysis on the Influence of Wheel/Rail Geometric Parameters on the Equivalent/Conicity
Hur Hyun-Moo ; Kwon Sung-Tae ;
Journal of the Korean Society for Railway, volume 8, issue 5, 2005, Pages 490~494
The geometric parameters between wheel and rail change wheel/rail contact geometry characteristics, and this influence dynamic behavior of rolling stock. So, the selections of optimum geometric parameters between wheel and rail is important for planning of railway system. In this study, we have analyzed the influence of geometric parameters like wheel flange-back distance, gage, and rail inclination on the equivalent conicity relating to dynamic behavior. The analyses show the following results. The widening of wheel flange-back distanc, the decrement of gage increase the equivalent conicity and the increment of rail inclination show the sharp change of the equivalent conicity.