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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
A Study of the Long Wave Track Defect Analysis for High Speed Railway
Kang Kee-Dong ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 111~115
The Study provides the technical background and calculation method f3r the long wave track defect. On high speed railway, It is necessary to manage the long wave band up to 80m track defect fur improving a riding quality. For this reason, Track recording methods for highspeed railway are used 10m and 30m recording bases, these are covered middle wave band and long wave band successfully. Extended base recording data is calculated by geometrical model and this data provides a good result for KTX riding index.
Soil and Track Interaction under Railway Loads
Kang Bo-Soon ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 116~121
In this report, numerical investigations have demonstrated, that the displacement underneath a moving loading reach a maximum value, if the speed of the load is equal to propagation velocity of the maximum wave. The load speed for which the maximum displacement occurs is called critical speed. The critical speed divides the velocities in a subcritical and a super-critical region. By means of calculations the dynamic behaviour of the slab track-soil is investigated. For concrete slab track dynamic wheel load are given in dependence of relevant excitation mechanismen and speed of the train. These loads can be used for the dimensioning of the track as well as far the prognosis of the vibrations at the track and the surrounding soil.
Damping of RC and SFRC Beams
Kang Bo-Soon ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 122~127
In this paper, damping behavior of steel fiber reinforced concrete(SFRC) beams by experimental and numerical method is discussed. Because of its improved ability to dissipate energy, SFRC has a better damping behavior than that of reinforced concrete(RC). Damping behavior is influenced by longitudinal reinforcement ratio, volume md type of steel fiber, strength of concrete and the stress level. Damping in the SFRC beams has been evaluated from dynamic experimental test data at various levels of cracked states in the beams. A FEM program(TICAL) has been developed based on the relationships between curvature and damping. It is observed far SFRC beams with 0.44
of tensile reinforcement steel that approximate 5
was relatively increased in the damping ratio generally depending on the load level.
Study on the Reinforcing Subgrade Depths of Highspeed and Conventional Railroads
Kim Dae-Sang ; Lee Su-Hyung ; Choi Chan-Yong ; Hwang Seon-Keun ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 128~136
The reinforcing subgrade, which first introduced Korea for the highspeed subgrade construction, has the many advantages to maintain the quality of ballast track as well as to prevent the softening of subgrade by mud-pumping. It causes the subgrade soil to spout into the ballast on many lines. Therefore, the application of reinforcing subgrade will be expected to increase in the future. This paper introduces the reinforcing subgrade as a maintenance-free technology f3r the railroad operation and the method f3r the determination of reinforcing subgrade depth. The criteria on reinforcing subgrade depths of highspeed and conventional railroad were verified from the calculation results based on an elastic analysis method.
A Study on the Optimal Span Length Selection of Conventional Railway Bridges considering Resonance Suppression
Kim Sungil ; Chung Wonseok ; Choi Eunsoo ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 137~144
The possibility of resonance exists always in railway bridges unlike highway bridges because railway bridges are loaded repeatedly by specific trains which has equidistant wheel loads. Resonance phenomenon of the bridge can be broken out when exciting frequencies by tram determined from the speed and effective beating internal coincides with natural frequencies of the bridge Excessive fluctuations of dynamic displacements and accelerations by resonance cause unpleasant passenger comfort and instability of railway structures. On the other hand, resonance suppression phenomenon that all the previous loads which pass through the bridge sum to zero can be occurred. In case we apply this resonance suppression properly, design of stable railway bridge from dynamics point of view can be made. In the present study, most dominant beating internal of conventional trams will be find. A(ter that. specific span length of the bridge which derives resonance suppression can be selected for railway bridges which accomplishes superior dynamic behavior.
Development of a Time-Based Railway Crossing Control System and Evaluation
Park Dongjoo ; Oh Ju-Taek ; Lee Sun-Ha ; Jung Chun-Hee ; Shin Seong-Hoon ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 145~154
Traffic accidents at highway-rail crossing result in larger social and economic damages than the accidents at the typical highway intersections. The traditional control and warning systems of the highway-rail crossing have limitations in that 1) they do not recognize the differences of the trains' arrival times because they rely on the distance-based control system, rather than the time-based one, and 2) thereby they usually cause longer delays of vehicles and pedestrians at the highway-rail crossings. The objective of this study is to develop a time-based railroad crossing control system which takes into account the speed and expected arrival time of trains. using the spot speeds and acceleration rates of trains measured at three points, the developed system was found to be able to accurately estimate the arrival time of train. VISSIM simulation package was utilized to compare system effect of the developed time-based railroad crossing control system with that of the conventional distance-based one. It was found that the developed time-based railroad crossing control system reduced the average travel time, maximum delay length, average delay time, and average number of stop-experienced vehicles as much as 7.0
, and 60.0
, respectively, compared with those from the conventional distance-based one.
Estimation of Train Position Using Sensor Fusion Technique
Yoon Hee-Sang ; Park Tae-Hyoung ; Yoon Yong-Gi ; Hwang Jong-Gyu ; Lee Jae-Ho ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 155~160
We propose a tram position estimation method for automatic train control system. The accurate train position should be continuously feedback to control system for safe and efficient operation of trains in railway. In this paper, we propose the sensor fusion method integrating a tachometer, a transponder, and a doppler sensor far estimation of train position. The external sensors(transponder, doppler sensor) are used to compensate for the error of internal sensor (tachometer). The Kalman filter is also applied to reduce the measurement error of the sensors. Simulation results are then presented to verify the usefulness of the proposed method.
A Study on Safety Requirement of ATP/LCS Interface
SHIN Ducko ; LEE Jae-Hoon ; LEE Key-Seo ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 161~169
In this paper, we provide safety requirements and advices to guarantee the safety of an interface in a level crossing system which is an interface between the conventional facilities and the new ATP (Automatic Train Protection) system, as well as we accomplish a safety management for the facilities of a country that has a different standard with already standardized ATP system. The system model has been made based on a safety activity of the international standard, and then a tolerance of a risk by the safety activity through PHA (Preliminary Hazard Analysis) has been analyzed. finally we achieved HIA (Hazard Identification and Analysis) for the assumptions that have been produced from a operating scenario and a functional interface. Thus, the safety requirements for the interface has been provided from the safety plan of HIA, and we showed the safety activity to guarantee the system safety through HIA which was depend on the design.
A study on a Prediction of Dangerous Failure Rate in the Embedded System for the Track Side Functional Module
SHIN Ducko ; LEE Jae-Hoon ; LEE Key-Seo ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 170~175
This study presents a prediction of a failure rate in a safety required system that consists of a embedded control system, requiring a satisfaction of a quantitative safety requirement. International Standards are employed to achieve a regular procedures in the whole life cycle of a system, for the purpose of a prediction and a evaluation of a fault that might be able to be happened in a system. This International Standards uses SIL (Safety Integrity Level) to evaluate a safety level of a system. SIL is divided into 4 levels, from level 1 to level 4, and each level has functional failure rate and dangerous failure rate of a system. In this paper we describe the conventional method to predict the dangerous failure rate and propose a method using hazard analysis to predict the dangerous failure rate. The conventional method and the technique using hazard analysis to predict the dangerous failure rate are made a comparison through the control modules of the interlocking system in KTX. The proposed method verify better effectiveness for the prediction of the dangerous failure rate than that of the conventional method.
A Study on the Effect of Corporate Culture on the Organizational Effectiveness. - Focusing on the Case of A Subway -
Shin Tack-Hyun ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 176~181
The purpose of this thesis is, based on the cognitive response of employees, to depict the phenomenon and the pattern of organizational culture in A Subway system, To attain this purpose, several aspects of organizational culture are surveyed through questionaire and analyzed by SPSS. The major findings are . 1) In general, the cognitive response of employees in railway-concerned firms on culture-related aspects is awfully negative. 2) Job satisfaction and involvement in A Subway is highly related to achievement factor in terms of culture. 3) According to the analysis based on four kinds of Job Groups, certain job groups such as drivers and vehicle maintenance are seen as having exceptionally negative attitude towards every aspects of their organization. So, some careful diagnosis and approaches to the symptoms, the causes, and the treatments are urgently needed.
Reliability Evaluation of Air Spring for Railway Vehicle
Woo Chang-Su ; Kim Wan-Doo ; Choi Kyung-Jin ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 182~187
Air spring system was widely accepted for railway vehicle secondary suspension to reduce and absorb the vibration and noise. The low natural frequency ensures a comfortable ride and an invariably good stiffness. In this paper, the characteristics and durability test was conducted in laboratory by using servo-hydraulic fatigue testing system to reliability evaluation of air spring for electric railway vehicle. The experimental results show that the characteristics and durability of domestically developed productions are shown in good results. And to guarantee the adaption of air spring, the ride comfort and air pressure variation were measured in train test on subway line.
Aging Characteristics of Glass Fabric/Phenolic Composites for Tilting Train Using Accelerated Aging Tester
Yoon Sung-Ho ; Nam Jung-Pyo ; Hwang Young-Eun ; Lee Sang-Jin ; Shin Kwang-Bok ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 188~194
Aging characteristics of glass fabric/phenolic composites for tilting train subjected to combined environmental aging factors were investigated. A 2.5KW accelerated aging tester with a xenon-arc lamp was used to provide environmental aging factors such as temperature, moisture, and ultraviolet. A series of aging tests were conducted up to 3000 hours and several types of specimens were prepared along the warp direction and the fill direction. Mechanical degradations for tensile, flexural, and shear properties were evaluated as a function of exposure times through a material testing system. Thermal analysis properties such as storage shear modulus, loss shear modulus, and tan 3 were measured through a dynamic mechanical analyzer. Finally exposed surfaces of the composites were examined using a scanning electron microscope. According to the experimental results, mechanical properties and thermal analysis properties of glass fabric/phenolic composites were found to be slightly degraded as a function of exposure times due to combined environmental effects.
Evaluation of Mode II Interlaminar Fracture Toughness for Carbon Fabric/Epoxy Composites for Tilting Train Carbody
Yoon Sung-Ho ; Lee Eun-Dong ; Heo Kwang-Soo ; Jung Jeong-Cheol ; Shin Kwang-Bok ;
Journal of the Korean society for railway, volume 8, issue 2, 2005, Pages 195~201
Mode II interlaminar fracture behaviors of carbon fabric/epoxy composites, which are applicable to tilting train carbodies, was investigated by the ENF (End notched flexure) test. The specimens were made of CF3327 plain woven fabric with epoxy and a starter delamination at one end was made by inserting Teflon film with the thickness of 12.5
m or 25.0
m. The equation for mode II interlaminar fracture toughness was suggested based on the effective crack length from the compliance of load-displacement curve. Mode II interlaminar fracture toughness was evaluated for several types of the specimens. Also crack propagating behaviors and fracture surfaces were examined through an optical travelling scope and a scanning electron microscope.