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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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Korean Society for Railway
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Volume & Issues
Volume 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
Stability and Safety Analysis on the Next Generation High-Speed Railway Vehicle
Cho, Jae-Ik ; Park, Tae-Won ; Yoon, Ji-Won ; Kim, Ji-Young ; Kim, Young-Guk ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 245~250
In this work, the stability and safety analysis are carried out to predict the performance of a next generation high-speed railway vehicle (HEMU-400X). Since the safety of the high-speed railway vehicles is very important, it is meaningful to predict the dynamic performance and stability of the railway vehicles using a numerical model at a railway vehicle design step. The critical speed of the dynamic model depending on the conicity of the wheel is calculated in the stability analysis. The critical speed calculated in this analysis is over 400km/h for the conicity value of 0.15, which is determined on the basis of representative international standard, UIC 518. Also, the lateral and vertical accelerations at several points of the same dynamic model are calculated for the safety analysis. In the simulation, the dynamic model runs at the test speed of 440km/h, which is determined considering a maximum target speed, and the total driving distance is 30km. And those estimated values are less than the allowed maximum acceleration values of UIC 518.
Comparison of Impact Simulation Result for Rolling Stock Vehicle Coupler System
Jang, Hyeon-Mog ; Kim, Ki-Nam ; Park, Young-Il ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 251~256
By legislating safety regulations for design, manufacturing and operation of rolling stock through rolling stock safety law, diverse of safety requirements have been established. On the other hands, differences of technical level in practical circumstances between domestic and overseas are pointed out that not be able to be overcome in short period. About collision safety requirements for rolling stock, European countries have been applying TSI requirement to all of rolling stock and domestic collision safety requirements in rolling stock safety law are based on TSI. In following thesis, it is showing an analysis simulation for current rubber cushion and hydraulic buffer system to verify if they are fit to collision safety requirements and result of the simulation program for prior verification. This also suggests a method to prove the performances of coupler system for future.
A Life Cycle Cost Model and Procedure for the Acquisition of Rolling Stocks
Kim, Jong-Woon ; Chung, Kwang-Woo ; Park, Jun-Seo ; Chung, Jong-Duk ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 257~263
Operation and maintenance cost of a rolling stock is generally higher than its acquisition cost. Therefore, it is necessary for reducing life cycle cost (LCC) to make rolling stocks easy and low costly for operation and maintenance. In addition, their operation and maintenance support systems should be effective and efficient. To accomplish this, operator should specify LCC requirements in the early stage of acquisition and make a contractor to provide the rolling stocks of low LCC. This article presents a procedure and a verifiable LCC model available in the general acquisition process where an operator specify requirements and a contractor provide the rolling stock meeting the requirements.
Applying Work Domain Analysis for Ecological Interface Design of Safety Monitoring System in the Urban Railway Station
Lee, Suk-Won ; Lee, Bong-Geun ; Back, Ji-Seung ; Jo, Seong-Sik ; Myung, Ro-Hae ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 264~270
This paper presents an application of the Ecological Interface Design (EID) theoretical framework for developing an optimal display of railway safety monitoring system (SMS) in stations. Especially, Work Domain Analysis (WDA) which is the preceding research for EID was conducted. This study proceeds as follows: First, urban railway SMS in stations was defined as a system boundary for WDA, and work environment for station personnels was analysed through Abstraction Hierarchy (AH). AH represents five levels (Functional Purpose, Values and Priority Measures, Purpose-related Functions, Object-related Process, Physical Object) of informations that station personnels obtain from work environment, and Work Domain Model (WDM) was derived as a result of the AH. To confirm how well WDM represents the real work environment of SMS, Scenario Mapping was conducted with experts who has been working as a station personnel for more than ten years. Lastly, thirteen additional information requirements that are not provided by the existing SMS as well as all the information that are provided by the existing SMS were extracted using confirmed WDM. These information requirements can be used as essential information for EID of urban railway SMS.
Study on the Axial Crushing Behaviors of UD Kevlar/Epoxy and Carbon-Kevlar/Epoxy Composite Tubes
Kim, Hyung-Uk ; Kim, Jung-Seok ; Jung, Hyun-Seung ; Yoon, Hyuk-Jin ; Kwon, Tae-Soo ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 271~277
In this paper, a numerical model for a Kevlar/Epoxy and Carbon-Kevlar/Epoxy tube used as an energy absorbing component has been developed and then results have been verified through experiment. The 2D shell element and Chang-Chang failure criterion of LS-DYNA that is commercial explicit FE code was used. Mechanical material properties for the model were obtained by material testing in advance. The numerical results were compared with quasi-static test results under axial compressive loading at 10mm/min. From the results, in the case of the Kevlar/Epoxy tube, load-crushed displacement curves were very close to the experiments and SEA (specific energy absorption) shows a good agreement with experimental one within less than 6%. However, the Carbon-Kevlar/Epoxy tube shows some differences with the experimental results.
Modeling for Power Supply Substation in Maglev Train System
Lee, Yun-Seong ; Kim, Jin-O ; Kim, Hyung-Chul ; Kim, Ju-Rak ; Lee, Jun-Kyung ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 278~282
Since a power supply substation of the magnetic levitation train system includes a inverter which is necessary to change the frequency of power, it has a different characteristic comparing to any other railway system. Nowaday a study for determining rating of facilities constituting a power supply system and modeling that system is undergoing. In this paper, a analysis model for the power supply system of the magnetic levitation train using the 3-level inverter is proposed. And the analysis for output characteristic is performed using the PSCAD/EMTDC program. The control method about the output of 3-level inverter for supplying power to loads in magnetic levitation train system is also described.
A Study on Image Noise Reduction Technique for Low Light Level Environment
Lee, Ho-Cheol ; Namgung, Jae-Chan ; Lee, Seong-Won ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 283~289
Recent advance of digital camera results in that image signal processing techniques are widely adopted to railroad security management. However, due to the nature of railroad management many images are acquired in low light level environment such as night scenes. The lack of light causes lots of noise in the image, which degrades image quality and causes errors in the next processes. 3D noise reducing techniques produce better results by using consecutive sequence of images. On the other hand, they cause degradation such as motion blur if there are motions in the sequence. In this paper, we use an adaptive weight filter to estimate more accurate motions and use the result of the adaptive filter to 3D result to improve objective and subjective mage quality.
A Deterministic Investigation for Establishing Design Load of Railway Bridges
Kim, Sung-Il ; Kim, Hyun-Min ; Lee, Myung-Suk ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 290~297
At present, the design live load of railway is divided into common railway and high speed railway separately in Korea. L22 which is based on American railway standards is used for common railway and HL25 which is based on Eurocode is used for high speed railway. Although, the design load is the starting point for design of railway, any research for developing design load does not exist at all. However, Europe and Japan develops the design load model consistently for advanced design. Recently, deterministic, probabilistic and cost performance approaches are investigated for developing new design load in Europe which is called LM2000. In the present paper, as a step for developing new design live load model for Korean railway, deterministic processes will be introduced. The safety margins are analyzed based on serviced real trains versus proposed new design load model and a necessity for new design live load will be presented quantitatively.
Evaluation of Deformation Characteristics for Bridge/Earthwork Transition Reinforcement Methods Considering Moving Load
Lee, Il-Wha ; Lee, Sung-Jin ; Lee, Su-Hyung ; Kang, Tae-Ho ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 298~303
The transition zone of the railway is the section which roadbed stiffness is suddenly varied like as tunnel-earthwork, bridge-earthwork and concrete track-ballasted track. There are about 450 tunnel-bridge transition sections on Kyungbu high-speed railway line. It is very important to pay careful attention to construction of these transition zones, in order to secure the train running safety. So, we developed a finite element model of the moving wheel loading to simulate the behavior of bridge-earthwork transitions in this paper. The most distinctive characteristics of the model proposed is to simulate the real wheel behavior on rail. And the main analysis object is to evaluate and compare the deformation characteristics of the transition zone according to the reinforcement methods and length of transition zone which is adopted to high-speed railway. Based on the analysis results, we assessed the effect of the reinforcements on the transition zone of high-speed railway.
Identification of Track Irregularity using Wavelet Transfer Function
Shin, Soo-Bong ; Lee, Hyeung-Jin ; Kim, Man-Cheol ; Yoon, Seok-Jun ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 304~308
This paper presents a methodology for identifying track irregularity using a wavelet transfer function. An equivalent wavelet SISO (single-input single-output) transfer function is defined by the measured track geometry and the acceleration data measured at a bogie of a train. All the measured data with various sampling frequencies were rearranged according to the constant 25cm reference recording distance of the track recording vehicle used in the field. Before applying the wavelet transform, measured data were regressed by eliminating those out of the range. The inverse wavelet transfer function is also formulated to estimate track geometry. The closeness of the estimated track geometry to the actual one is evaluated by the coherence function and also by FRF (frequency response function). A track irregularity index is defined by comparing the variance of the estimation error from the intact condition and that from the current condition. A simulation study has been carried out to examine the proposed algorithm.
A Study on Evaluation Method of Ride Comfort Considering Superimposition of Vertical and Horizontal Curve
Um, Ju-Hwan ; Yang, Sin-Chu ; Kim, Eun-Kyum ; Choi, Il-Yoon ; Kang, Yun-Suk ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 309~316
When the horizontal and vertical curves are superimposed in railway alignments, which affects the running stability, ride comfort, and track maintenance costs. However, when designing new lines or realigning existing ones, there are many cases of superimposition caused by the existing fixed points (bridge, tunnel, turnout, and catenary system, etc) on the conventional lines and undesirable impacts on the environment, etc. In this study, when the horizontal and vertical curves are superimposed, in order to optimize the horizontal curve in aspect of the ride comfort, the object function was developed and verified by vehicle dynamic analysis. Also, the solution algorithm for simplified evaluation method was presented.
An Exploratory Study on the Interaction between Learning Orientation and Environmental Turbulence - The Case of Railway Public Organizations -
Shin, Tack-Hyun ; Kim, Seong-Ho ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 317~326
The purpose of this study is to depict statistically and exploratively the interrelationship among learning orientation, environmental turbulence, and performance in the railway public organizations. To attain this purpose, a questionnaire was provided based on literature survey, and 616 respondent's data received was tested for its validity and reliability. And then, simple and vertical regression analysis were performed. The main findings are as follows: First, learning orientation has a relatively positive effects on performance. Second, environmental turbulence shows a partial moderating effects on the relationship between learning orientation and performance. These findings suggest that learning orientation do exist as an important organizational cultural dimension that contributes to the acquisition of sustainable competitive advantage, and some restrictive factors of public organizations seem to inevitably disrupt the intrinsic necessity of learning in the railway organizations.
Assessing the Efficiency of Freight Railroad Stations Reflecting Freight Item Importance Weights
Kim, Seong-Ho ; Choi, Tae-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 327~332
In this paper we presents an approach to assessing the efficiency of freight railroad stations reflecting freight item importance weights with multiple performance indicators and multiple operational condition indicators. We evaluate 187 freight railroad stations using data envelopment analysis with assurance region. Each freight item's loading/unloading volume is used as a performance indicator. Freight labor and yard capacity are used as operational condition indicators. Freight item importance weights are reflected to the data envelopment analysis as assurance region. The evaluation results facilitates the organization's decision making by providing valuable information.
Estimation of the Optimum Number of Rail Cars to Increase the Benefit
Kim, Kyoung-Tae ; Lee, Jin-Sun ; Park, Bum-Hwan ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 333~338
Investment in railroad, it is very important to find a way to increase a benefit to make the economic efficiency more positive, but is also considering that the cost will be higher. In this paper, we suggest a optimized model for increasing the benefit of railroad business considering of stopping patterns. According to existing analytical method, the operation hour is calculated based on that scenario regarding that it stops at all major stations but it does not fit the actual operation conditions. Considering various stopping patterns can be reasonably calculated the cost for required rail cars in the planning stages, and can also affect economic efficiency in a positive way.
A Study on Level of Service of Pedestrian Facility in Transfer Stations at Urban Railroad
Jang, Seong-Yong ; Han, Sung-Yoeb ; Kim, Si-Gon ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 339~348
The government continues to make efforts to improve effectiveness, integration and connectivity of public transportation systems. But there have been only a few studies about it. This paper addresses the quality evaluation of pedestrian facility service in transfer stations at urban railroad. LOS (Level Of Service) model of urban railroad by facility based on the body ellipse and density recalculated considering the recent Korean body standard and the suggested Pedestrian Moving Equivalent (PME) and Pedestrian Waiting Equivalent (PWE). For LOS model for the ticket booths and ticket vending machines, queuing theory has been applied to determine LOS of Pedestrians. And the importance weights among the pedestrian facilities is obtained by applying AHP analysis. Lastly, this paper shows and discusses the evaluation results of overall LOS of pedestrian facilities of five urban railroad transfer stations in Seoul.
Efficiency Analysis in Korean Railroad Lines using DEA Model
Kim, Hyun-Woong ; Lee, Jun ; Lee, Jin-Sun ;
Journal of the Korean Society for Railway, volume 13, issue 3, 2010, Pages 349~355
The purpose of this paper is to provide basic information on how to make better policies that improves efficiencies and to derive policy directions using DEA (data envelopment analysis) model. Through this paper, we can identify whether or not the railroad service has an excellent performance, if there are any structural problems, in which sector it is experiencing a degree of inefficiency, and, therefore, how to set up a realistic target to improve efficiency of railroad transportation. According to the result, we need to introduce a better resource efficient economic strategy to reduce the rail line extension and the number of passenger cars for better efficiency from a public interest perspective, while to widen headways and/or reduce the rail line extension from an economic point of view.