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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 16, Issue 6 - Dec 2013
Volume 16, Issue 5 - Oct 2013
Volume 16, Issue 4 - Aug 2013
Volume 16, Issue 3 - Jun 2013
Volume 16, Issue 2 - Apr 2013
Volume 16, Issue 1 - Feb 2013
Selecting the target year
A Study on a Standard Strategy of EMU Control and Monitoring System for Improved Maintenance Efficiency
Lee, Woo-Dong ; Chung, Jong-Duk ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 241~245
DOI : 10.7782/JKSR.2013.16.4.241
In the case of the existing train control system, the driver monitors the condition of the vehicle through a composite controller device that displays various information on a screen in the vehicle. However, when problems arise such as car trouble, it is difficult for the drivers to take action immediately. In addition, maintenance personnel have to manually save data one by one after storing the vehicle to analyze control information of the main devices such as the brake controller and auxiliary power. To improve these points, a system that sends and receives all information in real time should be established by installing a sensor communication network and a surveillance system. This study attempts to improve the safety and maintenance of rail vehicles by suggesting a standardized method for train control and surveillance system.
Comparison and Analysis of Vibration and Shock Test Methods for Rolling Stock Equipment
Kim, Young Guk ; Park, Chankyoung ; Ryu, Joon-Hyoung ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 246~252
DOI : 10.7782/JKSR.2013.16.4.246
The vibration characteristics of railway vehicles are very complex because they are not only dependent on vehicle and track conditions but also on operating conditions. Vibration can cause the failure of rolling stock equipment. To verify that the quality of rolling stock equipment is acceptable, it should be able to withstand vibration tests of reasonable magnitude and duration. There are many standards for vibration and shock tests of equipment in Korea. In this paper, we have reviewed and compared the standards (KS R 9144, R 9146 and IEC 61373) for vibration and shock tests.
Analysis of Unstable Vibration Modes due to KTX Brake Disc/Pad Interaction
Goo, Byeong Choon ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 253~261
DOI : 10.7782/JKSR.2013.16.4.253
According to the measured results of KTX brake squeal noise in this study, high level brake noise occurred in a wide frequency range, 100~18,000Hz. To identify the sources of the brake squeal noise, unstable vibration modes due to brake disc/pad interaction were analyzed under various conditions by the finite element method. Complex eigenvalues for a brake unit with a disc and four pads were obtained. It was found that the real parts of the complex eigenvalues, that is, unstable vibration modes, were closely related to friction coefficients, pressure on the brake cylinders, elastic moduli of the components, and other conditions.
A Study of Wireless Communication Network Constructing Policy Plan for an Efficient Railroad System Infrastructure
Lee, Seungho ; Kim, Sigion ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 262~271
DOI : 10.7782/JKSR.2013.16.4.262
Wireless communication networks are recently taking an important role in railroad systems as railways now require high speed and high density operation with the aid of advanced information technology to improve maintenance efficiency and to handle passenger service growth. Train control systems are consequently changing from track circuitbased systems to communication-based systems. This paper analyses the role of wireless communication networks in recent railroad systems, reviews foreign cases, and then suggests a communication network constructing policy for increased transport capacity increase, securement of safety, and efficient train control.
Voltage Sag and Swell Estimation Using ANFIS for Power System Applications
Malmurugan, N. ; Gopal, Devarajan ; Lho, Young Hwan ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 272~277
DOI : 10.7782/JKSR.2013.16.4.272
Power quality is a term that is now extensively used in power systems applications, and in this context the voltage, current, and phase angle are discussed widely. In particular, different algorithms that are capable of detecting the voltage sag and swell information in a real time environment have been proposed and developed. Voltage sag and swell play an important role in determining the stability, quality, and operation of a power system. This paper presents ANFIS (Adaptive Network based Fuzzy Inference System) models with different membership functions to build the voltage shape with the knowledge of known system parameters, and detect voltage sag and swell accurately. The performance of each method has been compared with each other/other methods to determine the effectiveness of the different models, and the results are presented.
Wave Propagation on a High-speed Railway Embankment Using a Pile-slab Structure
Lee, Il Wha ; Lee, Sung Jin ; Lee, Su Hyung ; Lee, Kang Myung ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 278~285
DOI : 10.7782/JKSR.2013.16.4.278
The suppression of residual settlement is required on earthwork sections as concrete track is introduced. Use of pile-slab structure is one of the settlement restraining methods applied on soft ground. The slab distributes the upper embankment load and piles transfer the load from the slab to the stiff ground. While this method is very effective in terms of load transfer, it has not yet been established for dealing with the vibration transfer effects and interaction characteristics between a structure and the ground. It is possible that vibration caused by a moving train load is propagated in the upper embankment, because the slab acts as a reflection layer and waves are multi-reflected. In this present paper, wave propagation generated by a moving train load is evaluated in the time and frequency domains to consider a roadbed structure using an artificial impact load and field measured train load. The results confirmed the wave reflection effect on the pile-slab structure, if the embankment height is sufficient, vibration propagation can be stably restrained, whereas if the height is not sufficient, the vibration amplitude is increased.
Three Dimensional Model for Dynamic Moving Load Analysis of a PSC-I Girder Railway Bridge
Cho, Jeong-Rae ; Kim, Dong-Seok ; Kim, Young Jin ; Kwark, Jong-Won ; Jang, Seung Yup ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 286~297
DOI : 10.7782/JKSR.2013.16.4.286
In this paper we evaluated dynamic stability, considering the effects of modeling and analysis methods on moving load analysis, for which a sophisticated 3 dimensional model of a PSC-I type girder bridge was used. For this purpose, we suggested a reasonable modeling method and the physical properties of the concrete and ballasted track system involved. We also analyzed the response characteristics according to: 1) the type of track system; 2) whether or not the track was modeled; 3) whether or not the distance between the girder center and the bearing were considered; 4) the analysis method (i.e., direct integral and modal analysis); 5) whether or not the frequency was filtered.
Study on Dynamic Characteristics of Structure Approaches by Train Moving Loads
Eum, Ki Young ; Kim, Young Ha ; Kim, Jae Wang ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 298~304
DOI : 10.7782/JKSR.2013.16.4.298
This paper systematically analyzes the dynamic effects of structure approaches which are expected to have direct effects on train loads - according to the train`s acceleration as the area under consideration is located in a section where acceleration of high speed railway vehicles and the train`s operating speed happens. In addition, through an examination of the dynamic train loads, dynamic behavioral characteristics of embedded structures and structure approaches were analyzed and a numerical analysis has been carried out in order to evaluate the performance of track subgrade and the safety of the structure. As a result, we reach the conclusion that the dynamic effects by train loads is low, but somewhat high vertical acceleration occurs.
Field Tests and Resonance Behavior Corresponding to the Damping Ratio of a High Speed Railroad Bridge
Kim, Sungil ; Kim, Hyunmin ; Park, Donguk ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 305~310
DOI : 10.7782/JKSR.2013.16.4.305
In general, it is difficult to measure dynamic responses of a bridge with stepwise increasing speed of a train during commercial service on a high speed railroad. However, before opening the 2nd stage of the Gyeongbu high speed railroad, there was an opportunity for field tests and measurements of the bridge with stepwise increasing speed(from 170km/ h to 315km/h). The measured responses were compared with the results of a developed bridge/train interaction analysis. Although good agreement was found throughout almost the entire range of speeds, relatively large differences were found in the vicinity of the critical speed at which resonance behavior of the bridge occurs. To investigate the cause of this, reanalyses are performed with re-estimated damping ratios from field tests.
Evaluation of Running Safety and Ride Comfort for High Speed Train in Cases of Superimposition of Vertical and Horizontal Curves
Um, Ju-Hwan ; Choi, IL-Yoon ; Kim, Man-Cheol ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 311~317
DOI : 10.7782/JKSR.2013.16.4.311
In railway construction, superimposition of horizontal and vertical curves has critical effects on the running stability and the ride comfort of vehicles as well as on construction costs. In this study, running safety, ride comfort, and track acting forces were analyzed by a numerical analysis using the VAMPIRE program according to cases of superimposition of vertical and horizontal curves. From the analysis results, it was found that running safety, riding comfort, and track acting forces in the case of superimposition of vertical and horizontal curves as well as vertical and transition curves meet all of the criteria. Also, in the case of the superimposition of vertical curves and curvature change between horizontal transition curves and circular curves meet all of the criteria.
A study on the Estimation Function of the Operating Cost for an Urban Railway (with a focus on Medium-sized Rapid Transit)
Chung, Su Young ; Lee, Won Young ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 318~330
DOI : 10.7782/JKSR.2013.16.4.318
It is necessary to estimate the operating cost for constructing an urban railway system. The present study was thus carried out to develop an estimation function of the operating cost for a MRT(Medium-sized Rapid Transit) system. We selected seven independent variables that could influence the operating cost: the rolling stocks, the number of trains in operation, the length of the lines, the number of stations, the number of passengers per day, the frequency of train operation, and the number of depots. We performed a multiple regression using Excel. Three types of regression functions were thereupon developed. All of them proved to be appropriate after comparing the results of the estimated cost. It will therefore be possible to use one of these three types, depending on the assumptions of the independent variables.
The Effects of Health, Cognition, and Safety Climate on Safety Behavior and Accidents: Focused on Train Drivers
Lee, Yong Man ; Shin, Tack Hyun ; Park, Min Kyu ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 331~339
DOI : 10.7782/JKSR.2013.16.4.331
This study highlights the theme of human error emerging as a critical issue in the railroad industry, conducting exploratory research on the effects of health, cognition, and safety climates on safety behavior and accidents using an empirical method. The statistical results based on questionnaires received from 204 train drivers indicate that psychological fatigue, cognitive failure, and internal locus of control as individual variables and CEO philosophy and behavior of immediate boss as organizational variables have significant relationships with safety behavior, while cognitive failure, CEO philosophy, behavior of immediate boss, and education were found to be significant variables with respect to accidents. Furthermore, unsafe behavior such as mistakes and violations showed negative effects on near misses and responsibility accidents, respectively. Based on these results, effective alternatives and countermeasures needed to mitigate human error were posited.
A Study on the Cause of Job Stress of Urban Railroad Drivers: Focused on Railroad Companies of Daejeon, Daegu, Incheon and Seoul Metro 9
Park, Taesoo ; Lee, Jinsun ; Kim, Hongki ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 340~347
DOI : 10.7782/JKSR.2013.16.4.340
This paper studied the causes of job stress of driving crews working in Metropolitan Transit Authorities in Daejeon, Daegu, Seoul Metro Line 9, and Incheon, analyzing psychological, physical, and environmental factors, along withdriving crews` assignments. Regarding driving crews` assignments, it was found that driving crews had strong senses of obligation for their job, and hence their aptitude for their job was in accordance, and also it was found that most driving crews worked devotedly with a desirable occupational view and pride. However, psychological and physical factors that contributed to stress were identified: lack of sleep, high task burden, physical fatigue, and boring daily life. Furthermore, the driving crews` irregular working conditions and irregular meal time and burden related to on-time transit service with prolonged immobilization raised their stress levels. In terms of external environmental factors, it was found that driving crews` anxiety due to possible accidents caused a roughly four-fold increase in stress levels compared to other factors. Furthermore, personnel system and salary issue were also found to be closely related to the driving crews` job stress.
Rail Toward River: The Relationship Between Railroad and River Transportation in Korea During Japanese Rule
Dodoroki, Hiroshi ;
Journal of the Korean Society for Railway, volume 16, issue 4, 2013, Pages 348~351
DOI : 10.7782/JKSR.2013.16.4.348
The aim of this research is to analyze and periodize the relationship between railroad and river transportation as one aspect of the transformation of the land transportation system in Korea. As a result, three phases can be observed: a first phase of equality and interdependence (1910s); a second phase, subordinating rivers to feeder lines under railroad`s dominance; and a third phase when trucks and buses became a major means for local transportation in place of traditional shipping routes. River ports were among the main planned destinations during the first and second phases, but such plans were changed or withdrawn after the third phase. This relationship between river and rail illustrates one geopolitical factor relating to the development of Korea`s rail transportation network.