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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 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
Analysis of the Current Collection Quality for Next Generation High-Speed Trains with Measurements of the Dynamic Contact Force
Oh, Hyuck Keun ; Ji, Hyung Min ; Kim, Young Guk ; Kim, Seogwon ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 157~164
DOI : 10.7782/JKSR.2014.17.3.157
The contact force between the pantograph and the catenary is a key factor determining the current collection quality, as they can ensure stable electrical power to the train. In this study, we analyzed the dynamic contact force for HEMU-430X depending on the train speed. It was confirmed through the results that the standard deviation of the contact force increases with an increase in the train speed. It was also verified that the span of the catenary system is a very important factor with regard to the contact force when analyzed with frequency analysis. To secure stable power in speed that exceeds 400km/h, the statistical variation of the contact force should be minimized. To realize this, the catenary tension was increased and the mass of the pan-head was decreased. The ensuing effects were then quantitatively analyzed in terms of the contact force. In addition, the differences in the contact force between a tunnel and an open field were analyzed based on a frequency analysis.
Assessment of the Running Resistance of a High-speed Train Using a Coasting Test
Kwon, Hyeok-Bin ; Kim, Seogwon ; Oh, Hyuck Keun ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 165~170
DOI : 10.7782/JKSR.2014.17.3.165
The resistance to motion of the Korean next-generation high-speed train (HEUM-430X) was assessed on the basis of 12 coasting test runs at coasting speeds up to approximately 380km/h. Two different methods, a linear regression method and a time-integral method, were employed to calculate decelerations from the time-velocity data and the time-distance data, respectively, and an equation of resistance to motion was devised from the deceleration data calculated at each time section. The effect of an improvement of the aerodynamic shape on the resistance to motion was investigated, with the results showing that the running resistance was reduced by about 15% due to these improvements. An increase of approximately 28% of the running resistance was also noted when running in a tunnel relative to running through an open field.
The Reactive Power Compensation for a Feeder by Control of the Power Factor of PWM Converter Trains
Kim, Ronny Yongho ; Kim, Baik ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 171~177
DOI : 10.7782/JKSR.2014.17.3.171
PWM converter trains exhibit excellent load characteristics in comparison with conventional phase-controlled trains with low power factors, as they can be operated at power factors which are close to unity by means of a voltage vector control method. However, in the case of a high track density or extended feeding, significant line losses and voltage drops can occur. Instead of operating these trains at a fixed unity power factor, this paper suggests a continuous optimal power factor control scheme for each train in an effort to minimize line losses and improve voltage drops according to varying load conditions. The proposed method utilizes the steepest descent algorithm targeting each car in the same feeding section to establish the optimized reactive power compensation levels that can minimize the reactive power loss of the feeder. The results from a simulation of a sample system show that voltage drops can be improved and line losses decreased.
A Study on the Characteristics of Environmental Impact in Construction Sector of High-Speed Railway using LCA
Lee, Cheol ; Lee, Jae-Young ; Jung, Woo-Sung ; Hwang, Young-Woo ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 178~185
DOI : 10.7782/JKSR.2014.17.3.178
This study investigates the characteristics of environmental impact from the construction phase of a high-speed railway through a Life Cycle Assessment method based on the materials used and the energy consumption of the equipment used according to the design statement. The results reveal that the contributions to environmental impact in the construction sector of a high-speed railway were 89% for civil engineering, 7% for the track system, 2% for stations and 2% for the energy and telecommunication system. In particular, the highest contribution to the impact in the civil engineering category were 54% for Global Warming, 25% for Abiotic Resource Depletion and 8% for Photochemical Oxidant Creation. The main influence factors were the use of remicon and cement. In future, the application of Life Cycle Assessment for the construction sector of railway construction will introduce efficient reduction methods according to the quantitative calculation of environmental impact.
Probabilistic Study on Pressure Behavior in Concrete Vacuum Tube Structures
Park, Joonam ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 186~192
DOI : 10.7782/JKSR.2014.17.3.186
In this paper, a reliability analysis is performed where the pressure change inside a concrete tube is probabilistically estimated considering the uncertainties inherent in the material and the system discontinuity. A set of uncertain quantities related to the equivalent system air permeability and the atmospheric pressure, are defined as random variables with specific distribution. The pressure change inside a concrete tube is then probabilistically described using both analytical and simulation approaches. The reliability analysis confirms that the geometric configuration of a concrete tube needs to be changed from the initial configuration obtained from the deterministic analysis.
The Fatigue Life Evaluation of Continuous Welded Rail on a Concrete Track in an Urban Railway
Kong, Sung-Yong ; Sung, Deok-Yong ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 193~200
DOI : 10.7782/JKSR.2014.17.3.193
In this study, fatigue tests on existing continuous welded rail (CWR) on a concrete track were carried out. Based on the test results, a S-N curve expressing the remaining life of the CWR at a fracture probability of 50% was obtained using weighted probit analysis suitable for small-sample fatigue data sets. As rails had different histories in terms of accumulated passing tonnage, the test data were corrected to average out the accumulated passing tonnage. The remaining service life for the CWR on the concrete track in an urban railway was estimated using the prediction equation for the bending stress of rail developed in the past to estimate rail base bending stress and taking the surface irregularities into consideration. Estimating the remaining service life of the CWR in an urban railway showed that the rail replacement period could be extended over 200MGT. In addition, comparing the concrete track to the ballast track, the fatigue life of rail was analyzed as approximately 300MGT higher than. Therefore, the rail replacement criteria needs to distinguish between the ballast track and the concrete track, and not the criteria needs to be changed as a target for the maintenance, although it is necessary to remove longitudinal rail surface irregularities at welds by grinding.
A Comparative Analysis of TOD Planning Elements of Major Urban Railway Station Areas in Seoul
Lee, Jun-Beom ; Jin, Won-Young ; Seo, Eun-Young ; Won, Jai-Mu ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 201~209
DOI : 10.7782/JKSR.2014.17.3.201
Transit Oriented Development(TOD) has been the dominant paradigm for urban development. The traditional approach to the development of urban rail station areas demonstrates apparent weaknesses when it comes to compact and mixed-use types of development for these stations. Thus, the objective of this study is to derive evaluation indicators with which to assess urban rail station areas using TOD planning elements. A focus group interview was conducted to explore TOD planning elements. In order to examine the level of TOD to be achieved, an AHP technique was utilized to analyze the importance of several variables. Z-scores and Re-scores were applied to derive the values for the stations. The Variables related to the land use type, mixed use, floor area, and public transit were found to be the major contributing factors to the achievement of TOD in urban rail station areas. The results of this study show that the level of TOD achievement varies according to the major land use, density, accessibility, and mixed-use planning elements.
An Analysis of Boarding and Alighting Times for Urban Railway Vehicles
Kim, Jungtai ; Kim, Moo Sun ; Hong, Jae Sung ; Cho, Yong Hyun ; Kim, Taesik ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 210~215
DOI : 10.7782/JKSR.2014.17.3.210
Various methods have been developed in an effort to increase the scheduled speeds of the urban railways. Reducing the train dwell times by extending door widths is one such method. However, there is thus far no domestic model of boarding and alighting that is appropriate to lead to boarding and alighting time reductions if the door width is extended. Foreign models are not suitable because human behaviors, which are important factors when assessing boarding and alighting times, differ from country to country. In this study, a boarding and alighting model for domestic urban railways is proposed and related equations and parameters are derived from measured and experimental data. The model can be employed to assess time reductions in Korean railroad system if the door widths are extended.
An Analysis of Energy Consumption and GHG Emission per Unit of Rail and Road Transportation
Kim, Byung-Kwan ; Lee, Jin-Sun ; Kim, Hyoun-Ku ; Lee, Jae-Young ;
Journal of the Korean society for railway, volume 17, issue 3, 2014, Pages 216~222
DOI : 10.7782/JKSR.2014.17.3.216
In general, the rail transportation recognized as a better transportation mode than road transportation in terms of the environment. However, due to a lack of quantitative analysis based on Korean data, foreign cases for environmental advantages of the railway have often been cited in Korea. To address this issue, we estimated the energy consumption of passenger and freight transportation using certified activity data from Korea Railroad Statistics and the Electrical Work Report for railway and the Energy Consumption Survey for road. We estimated the Green House Gas emission of passenger and freight transportation on a Tier 1 level by applying the IPCC 2006 Guideline. Finally, we calculated the energy consumption unit and GHG emission unit to determine the environmental impact of rail and road transportation. We also compared the analyzed results of high-speed rail and auto as typical means of rail and road transportation.