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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 15, Issue 6 - Dec 2012
Volume 15, Issue 5 - Oct 2012
Volume 15, Issue 4 - Aug 2012
Volume 15, Issue 3 - Jun 2012
Volume 15, Issue 2 - Apr 2012
Volume 15, Issue 1 - Feb 2012
Selecting the target year
Analysis of Aerodynamic Noise Generation from Pantograph Using Panhead Models of Simple-Geometry and Its Reduction
Yi, Suk-Keun ; Yang, Won-Seok ; Koh, Hyo-In ; Park, Junhong ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 531~536
DOI : 10.7782/JKSR.2012.15.6.531
This study presents a result on aero-acoustic characteristics of pantograph panheads. To analyze the fluid flow around the panhead and resulting sound radiation, simple models of panhead were used in the numerical simulations called Lattice-Boltzmann method. The simulation results were verified using the wind tunnel test. The main aerodynamic noise was generated from the vortex shedding which is characterized by the Strouhal number, flow speed and geometry. The reduction in the radiated noise with simultaneously achieving increased lifting force was implemented for the simple rectangular geometry used in this study. Also, it was shown that the radiated sound power was significantly reduced by minimizing vortex shedding using through-holes or streamline shapes.
Theoretical Analysis on Overturn Safety of Train affected by Wind Pressure
Nam, Seong-Won ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 537~542
DOI : 10.7782/JKSR.2012.15.6.537
Rolling stocks are often subjected to the effects of natural strong wind or wind pressure caused by the crossing train. These wind pressure cause the falling-off in running stability and overturn safety. It is sometimes reported that trains are blown over by a gust of wind. So, many countries enact regulations to secure the overturn safety for wind speed. In this study, theoretical equations of overturn safety based on multi-body model are derived and analyzed the difference between the result of the solid model and that of multi-body model. In case of multi-body model, it is assumed that the degrees of freedom for carbody and bogie are assigned an independent values respectively. The results show that the latter approach based on multi-body model can access the overturn safety of train and replace the conventional method by using commercial software which is accessing with decrement of wheel load.
A Study on Tail Vibration Reduction for the Next Generation High Speed EMU
Jeon, Chang-Sung ; Kim, Young-Guk ; Kim, Seok-Won ; Kim, Sang-Soo ; Choi, Sung-Hoon ; Park, Tae-Won ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 543~549
DOI : 10.7782/JKSR.2012.15.6.543
This study describes the tail vibration reduction for the next generation high speed EMU(HEMU-430X). The model of 6 cars was generated and the calculation was performed using VAMPIRE(railway vehicle dynamic software). In view of ride characteristics, HEMU-430X was expected to sway at the tail because of the yaw damper direction. The lateral acceleration of vehicle body exceeded the criteria because of hunting. To reduce this hunting motion, some methods such as wheel profile change, the change of damping coefficient for the 2nd lateral damper, the damping coefficient change of yaw damper were tested, but had little effect. Finally, the yaw damper direction was changed and the tail vibration disappeared. In real running test, the tail vibration appeared at the speed of 150km/h and the yaw damper direction change made the vehicle stable at the speed of 300km/h. The maximum test speed of HEMU-430X is 430km/h. If the tail vibration appears at higher speed, some other methods in this study may be considered to reduce it.
A Case Study on Improving for Operating ATC/ATO System and Driving Environment Using FMECA
Kim, Hanyoung ; Lee, Jinchoon ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 550~557
DOI : 10.7782/JKSR.2012.15.6.550
In general, FMECA is a technique for identifying failure modes and devices which could result in fatal outcomes. Also it can be used in design or in maintenance through establishing priorities. The purpose of this paper is aimed at improving the driving conditions in advance through analyzing the operation failure phenomena quantitatively with FMECA analysis on the onboard signal system equipped with ATC/ATO, and through deriving the risk factors. This paper suggests an alternative solution for improving the performance of ADU by analyzing a case with FMECA.
Study on the Temperature Distribution of Cabin under Various Car Heating Modes
Cho, Youngmin ; Yoon, Young-Kwan ; Park, Duck-Shin ; Kim, Tae-Wook ; Kwon, Soon-Bark ; Jung, Woo-Sung ; Kim, Hee-Man ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 558~565
DOI : 10.7782/JKSR.2012.15.6.558
Abnormal climate or weather is more frequently reported nowadays due to the global climate change. Especially, extremely low temperature in winter season may cause bad thermal discomfort of passengers. In this study, the effect of car heating modes on cabin temperature change and distribution was studied by using a real-scale environmental chamber for passenger cabin. It was found that the cabin temperature rose quickly at the initial stage of heating system operation, but it stopped increasing after certain point. And, temperature was higher when the height from the floor was higher. Based on the obtained result, the way to minimize the decrease of passengers' thermal comfort was suggested.
Burn-in Test Case Study for Heavy Maintenance to Improve the Reliability
Kim, Hanyoung ; Lee, Jinchoon ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 566~571
DOI : 10.7782/JKSR.2012.15.6.566
The door systems in urban railway vehicles, through heavy maintenance checks by six years, 75 parts for 34 part types in 75 units have to be replaced periodically, and the remaining 68 parts for 40 part types to be replaced occasionally based on the necessity. Even though this process makes the door systems almost to be initial status, the systems have complicated mixes of components with new parts and used and then have different property from the original ones. This study suggested a burn-in test as a subsidiary tool to improve the reliability of urban railway vehicles, and suitable for testing conditions and the proposed new target value.
A Study on Efficiency Improvement of the Catenary-Pantograph Dynamic Interaction Analysis Program using Shift Forward Method
Lee, Jin-Hee ; Park, Tae-Won ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 572~578
DOI : 10.7782/JKSR.2012.15.6.572
In the electric railway vehicles, securing stable current collection performance is an important factor which determines the quality of operation and the maximum speed. In order to predict such current collection performance, various analysis methods have been proposed for a long time. Also, investigations for improving the accuracy of the results and the efficiency of the analysis process have been performed. In this paper, a method for the efficiency improvement has been proposed. This method is based on the basic concept that the system equations of motion of a catenary numerical model include only interactive range with a pantograph. In this paper, an algorithm and generalized process for applying proposed method are introduced. Also, validity of the results and utility of the method was verified and studied.
Experimental Study for the Capacity of Ordinary and Emergency Ventilation System in Deeply Underground Subway Station
Jang, Yong-Jun ; Lee, Ho-Seok ; Park, Duck-Shin ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 579~587
DOI : 10.7782/JKSR.2012.15.6.579
Shin-gumho station in Seoul underground subway have been selected to be experimentally investigated and analyzed for the real air supply & exhaust capacity compared to the original capacity of ordinary and emergency condition. The depth of Shin-gumho station is 43.6m which consists of the island-type platform (
floor in underground) and a two-story lobby (first & second floor in underground). An emergency staircase connects between the platform and the lobby. Hot-wire anemometer, capture hood, wind vane & velocity meter and data acquisition systems are employed to perform the automatic measurement in this experiment. For ordinary case, air supply and exhaust capacity in the lobby were reduced by 34% and 46% compared to the original capacity, respectively. Air supply and exhaust capacity in the platform were reduced by 66% and 38%, respectively. For emergency case, air supply in the lobby was reduced by 42% and air exhaust in the platform was reduced by 28% compared to the original capacity. Therefore, air pollution in the station is expected to be worse in the ordinary environment and smoke control capability in the platform will be weakened in case of fire emergency.
Semi-analytical Annular Mindlin Plate Element for Out-of-plane Vibration Analysis of Thick Disks
Kim, Chang-Boo ; Cho, Hyeon Seok ; Beom, Hyeon Gyu ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 588~596
DOI : 10.7782/JKSR.2012.15.6.588
This paper presents a new semi-analytical annular Mindlin plate element with which out-of-plane natural vibration of thick disks can be analyzed simply, efficiently, and accurately through FEM by including effects of rotary inertia and transverse shear deformation. Using static deformation modes which are exact solutions of equilibrium equations of annular Mindlin plate, the element interpolation functions, stiffness and mass matrices corresponding to each number of nodal diameters are derived. The element is capable of representing out-of-plane rigid-body motions exactly and free from shear locking. Natural frequencies of uniform and multi-step disks with or without concentric ring support are analyzed by applying the presented element. Such results are compared with theoretical predictions of previous works or FEA results obtained by using two-dimensional shell element to investigate the convergence and accuracy of the presented element.
A Study on the Material Characteristics of Contacts on Bias Track Relay
Kim, Hee-Dae ; Lee, Sung-Il ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 597~603
DOI : 10.7782/JKSR.2012.15.6.597
The cases for selecting contact materials of Ag and AgC for Bias Track Relay are the studies and their safety evaluations are proposed in this paper. The welding at the relative low current has occurred in Ag contacts, but the one has not occurred in AgC contacts although the high currents flow since it has an excellent temperature characteristic. In the repetitive switching experiment, more unstable resistance and transfer phenomena has occurred in contacts as the switching numbers of AgC contacts increase, which results in more consumption of contacts. In the experiments, there exists a trade off relationship between welding and resistance variation. AgC contacts have excellent characteristics in welding, but the caution is required in using them since a lot of repetition switching produces much resistance variation. However, Ag contacts have excellent characteristics in repetitive switching, but weak ones in welding.
A Train Locating Device Using the Current Phase Difference Upon Magnetic Field Variation
Choi, Jae Sik ; Kim, Baik ; Rho, Sung Chan ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 604~608
DOI : 10.7782/JKSR.2012.15.6.604
Traditionally, the track circuits have been used for the purpose of train locating. However, the recent train control systems like a CBTC(Communications Based Train Control) do not utilize the track circuits to minimize the amount of ground signal devices. Therefore, there are increasing concerns over the system that can locate the position of train exactly without using the track circuits. Then, the contactless locating methods are added to ensure safety when the shunting sensitivity of the track circuit becomes low for the existing sections equipped with the track circuits. In this paper, a prototype of train locating device has been designed and tested, which utilizes the current phase difference upon magnetic field variation. The results show improved features of this method over the conventional track circuits method.
A Study on TPS based on ATO for Driverless LRT
Lee, Chang Hyung ; Lee, Jongwoo ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 609~615
DOI : 10.7782/JKSR.2012.15.6.609
TPS (Train Performance Simulation) based on ATO (Automatic Train Operation) is required for driverless LRT (Light Rail Transit) operation plan instead of typical TPS based on driver operation. In this paper, new TPS model using ATO pattern is proposed and compared with the automatic train operation result in a test line of Seoul Metro Line 6 and in a whole line of Busan-Gimhae LRT. The actual ATO pattern can be very accurately simulated by new TPS model with the introduction of 4 parameters such as commercial braking rate, jerk, station stop profile and grade converted distance. The commercial scheduled time for driverless automatic train operation can be proposed to have "Fast" mode TPS trip time plus 3 seconds/km margin recommended by Korean standard LRT specification in this paper.
An Experimental Study of Seismic Retrofit on the Viaduct Bridge of Rail Transit
Kim, Jinho ; Shin, Hongyoung ; Park, Yeonjun ; Hur, Jinho ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 616~622
DOI : 10.7782/JKSR.2012.15.6.616
Earthquake damage of viaduct bridge of railroad may give rise to social loss due to transport restrictions greater than cost of structural recovery. Therefore, viaduct bridge of railroad should have ensure adequate seismic performance. But, results of seismic performance evaluation, many of seismic retrofit was required. In this study, five scale models of columns were made and four of them were reinforced by HT-A(HyperTex & perforate Aluminum) which is improved than existing method. Testing the columns by constant axial load and cyclic lateral displacements, seismic performance of columns has been verified from the result of evaluating the stiffness, ductility and energy dissipation capacity.
Development of Permanent Deformation Prediction Model for Trackbed Foundation Materials based on Shear Strength Parameters
Lim, Yujin ; Hwang, Jungkyu ; Cho, Hojin ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 623~630
DOI : 10.7782/JKSR.2012.15.6.623
Formation used as trackbed foundation for providing vertical bearing capacity onto rail foundation are composed of crushed stones usually with certain type of grain size distribution. Permanent deformation in trackbed foundation can be generated by increasing number of load repetition due to train traffic increases, causing track irregularity. In this study, a specially prepared trackbed foundation materials (M-40) used in Korea has been tested using a large repetitive triaxial compression apparatus in order to understand resilient and permanent deformation characteristics of the material. From these test results, resilient and permanent deformation characteristic are analyzed so that a permanent deformation model is developed which can consider number of load repetition N, confining stress (
), shear stress ratio(
) and stiffness of the material.
Development of Optimal Train Operation System in Bottle-neck Section According to the Opening of High Speed Railway in Seoul Metropolitan Area
Chun, Chunggeun ; Chung, Sungbong ; NamKung, Baekkyu ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 631~637
DOI : 10.7782/JKSR.2012.15.6.631
New Opening of Suseo-Pyeongteak High Speed Railway (HSR) will be a new leap in the Korean railway history. However if this section of HSR line around Seoul Metropolitan Area opens, the confluence of new HSR and existing HSR line in Pyeongteak-Osong section will cause a bottle neck problem. In other words, the opening of Suseo-Pyeongteak HSR line will make the capacity of track reach the limit and the section of railroad between Pyeongteak and Osong will be saturated. This will also make such troubles as restricting the number of train which stops at Cheonan-Asan station. In this study, based on the train assignment theory of TVM430 signal system, the methods of calculating headway and number of train are reviewed and the plan for application of optimal operation pattern during peak hour between Pyeongteak-Osong section is also suggested. To remove the bottle neck problem in this HSR section, 3 alternatives are suggested and the expected effects and problems of each alternative are also analyzed. The results show that the troubles caused by excess of track capacity can be removed without any additional cost if the minimum headway in operating system for HSR is adopted in this section. In the future, if these alternatives are considered to the long-term plan for operating train and signal systems, this will improve the efficiency of train operation, which can remove the bottle neck in the HSR line.
Estimation of Line Utilization Rate and Track Maintenance Time of Conventional Railway
Ki, Hyungseo ; Park, Dongjoo ; Kim, Dongsoo ; Kim, Haengbae ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 638~644
DOI : 10.7782/JKSR.2012.15.6.638
In this study, we numerically estimated available and unavailable time of conventional railway by examining 60% which is known as average range of track utilization efficiency. We also estimated track repair time for maintenance which is the main factor of making track utilization change and analyzed appropriate estimated time. The railway's safety should be guaranteed by appropriate railway operating plan and by adequate rail facilities maintenance. At the same time, daily railway train 'Dia's recovery power should be reflected to the management plan. Considering these factors, we examined mechanical equipment and the national rail network in order to rationally estimate track repair time of the maintenance and to secure spare time in case of train delays. It was found that track utilization efficiency was more or less 60%.
A Study on the Effects of KTX Driver's Person-Environment Fit on Job Satisfaction, Organizational Commitment, and Turnover Intention
Kim, Tae-Seong ; Hur, Chan-Young ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 645~653
DOI : 10.7782/JKSR.2012.15.6.645
This study analyzes the effects of the KTX driver's person-environment(job, organization, Coworker) fit on job satisfaction, organizational commitment and turnover intention. It, additionally, examines the mediating effect of job satisfaction and organizational commitment between person-environment fit and turnover intention. Consequence of the analysis indicates that person-environment fit has mostly meaningful influences on job satisfaction, organizational commitment and turnover intention. But person-job fit makes a meaningless impact on job satisfaction, and person-coworker fit also makes a meaningless impact on job satisfaction and turnover intention. The mediating effect of job satisfaction and organizational commitment is mostly effective, but the mediating effect of job satisfaction does not affect the relation between person-organization fit and turnover intention. In conclusion, this study implies that, in order to grasp KTX driver's turnover intention and to protect actual turnover, it is important to enhance job satisfaction and organizational commitment as well as to improve overall person-environment fit.
Comparative Analysis on Importance of TOD Planning Factors according to Decision Making Methods
Lim, Sam-Jin ; Park, Jun-Tae ; Kim, Tae-Ho ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 654~661
DOI : 10.7782/JKSR.2012.15.6.654
This study aims to identify the difference between the actual characteristics of urban station influence areas and the recognition of the importance of such characteristics in planning, by analyzing the importance of transit-oriented development (TOD) planning factors that influence the use of public transportation. In terms of the methodology for the assessment, this study gives in-depth discussions over the validity of assessment methods that utilize quantitative data and those that rely on qualitative surveys of experts. Based on such discussions, the study analyzes the importance of the actual characteristics of station influence areas (quantitative) and the characteristics in planning identified by experts (qualitative), thereby suggesting implications for the orientations for future development of station influence areas.
A Study on the Improvement of Railway Construction Schedule Using KTX Construction Case
Yang, Yeonjong ; Chung, Byunghyun ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 662~669
DOI : 10.7782/JKSR.2012.15.6.662
In 2004, KTX operated in Korea on the 5th in the world. But there are various factor on planed schedule delay of Big National Construction Project like Seoul-Busan High Speed Rail Project(Seoul-Busan HSR). For example, Often change of government policy, project management control problem of design and construction, conflict of interested party like environmental organization/resident are the main delay factors. The suggestions for improvement of the construction schedule through the Seoul-Busan HSR will help to make a new leap forward in rail construction.
A Comparative Study on Methods of Assessing Railroad Track Capacity
Oh, Suk-Mun ; Rho, Hag-Lae ; Kim, Young-Hoon ; Hong, Soon-Heum ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 670~681
DOI : 10.7782/JKSR.2012.15.6.670
In this paper, we review a variety of state-of-the-art research on assessment of the railway track capacity. We address the three well-known methods (Yamagishi, UIC 406, and TCRP-13) with individual case study in this research field. First, we explicitly present every derivation-step of the Yamagishi equations that has been most frequently applied in the Korean railway without clear understanding for it. Further, we present a prospective application scheme of the method as an analytic assessment method. Second, we address establishing process of UIC 406 standard and its application method, which is known as the standard method in Europe. Finally, we address the method and application of TCRP-13, and present comparison between the three methods. This paper is expected to contribute for improving understand on the in-using equations and methods in practice as well as for activating application of the internationally well-used method to the Korean railway.
A Study on the Railroad Logistics Resources Development Policy Analysis
Kim, Jung-Phyung ;
Journal of the Korean society for railway, volume 15, issue 6, 2012, Pages 682~687
DOI : 10.7782/JKSR.2012.15.6.682
This study is made to link up the policy analysis theory flame and practice concerning the analysis of the railroad logistics resources development policy and propose an alternative to feasibility for the railroad logistics resources development policy in general. The specific objectives to achieve the purpose of this research are as follow: First, In consideration of the railroad logistics resources development policy and theory of policy analysis idea and goals, for analysis of the railroad logistics resources development policy analysis are to be instituted more systematically. Second, the theory of the railroad logistics resources development policy analysis will be made more systematic and use it as basis of the said analysis for further.