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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 18, Issue 6 - Dec 2015
Volume 18, Issue 5 - Oct 2015
Volume 18, Issue 4 - Aug 2015
Volume 18, Issue 3 - Jun 2015
Volume 18, Issue 2 - Apr 2015
Volume 18, Issue 1 - Feb 2015
Selecting the target year
Study on MFL Technology for Defect Detection of Railroad Track Under Speed-up Condition
Kang, Donghoon ; Oh, Ji-Taek ; Kim, Ju-Won ; Park, Seunghee ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 401~409
DOI : 10.7782/JKSR.2015.18.5.401
Defects generated in a railroad track that guides the railroad vehicle have the characteristic of growing fast; as such, the detection technology for railroad track defects is very important because defects can eventually cause mass disasters like derailments. In this study, a speed-up test facility was fabricated to investigate the feasibility of using magnetic flux leakage (MFL) technology for defect detection in a railroad track under speed-up condition; a test was conducted using a railroad track specimen with defects. For this purpose, an MFL sensor head dedicated to the configuration of the railroad was designed and test specimens with artificial defects on their surfaces were manufactured. Using the test facility, a speed-up test ranging from 4km/h to 12km/h was performed and defects including locations were successfully detected from MFL signals induced by defects with enhanced visibility by differentiating raw MFL signals. In the future, it should be possible to apply this system to a high-speed railroad inspection car by improving the lift-off stability that is necessary for speed-up of the developed MFL sensor system.
A Study on Material Development for and Application of a Slider of Pantograph
Cho, Kyu-Hwa ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 410~418
DOI : 10.7782/JKSR.2015.18.5.410
A slider of the pantograph undergoes uneven and abnormal wear due to sliding contact with the catenary. In the case of rain, the loss of lubricant increases the frictional resistance for the reciprocating motion between the catenary and the slider, accelerating local wear. The slider in the winter should have good wear resistance, which can be achieved through alloy design. Uneven and abnormal wear were not observed in the results of a driving test using a wear resistant slider. It was found that the increased density of the slider enhanced the corrosive effects of Fe-Ti, preventing the occurrence of abnormal wear by maintaining the wear and arc resistance in the rainy season. Also, mechanical and electrical wear did not affect the composition of the slider, and this improved the wear resistance. Inaddition, the slider was applied to an entire train and was tested during driving; ananalysis of the correlation of the catenary was performed, including during the rainy season and the winter season.
Study of an Optimal Control Algorithm for Train Interval Under Disturbance
Kim, Kiwoong ; Lee, Jongwoo ; Park, Minkee ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 419~425
DOI : 10.7782/JKSR.2015.18.5.419
When a train is delayed because of a disturbance, the time interval between successive trains increases and high-frequency metro lines can become unstable. Time interval control is therefore necessary in preventing such instabilities. In this paper, we propose an optimal interval control algorithm that is easy-to-implement and that guarantees system stability. In the proposed method, the controlled trains are determined from the time interval deviations between successive trains; the control algorithm for staying time is designed by use of a discrete traffic model to ensure an optimal time interval between successive trains. The results of a computer simulation are also given to demonstrate the validity of the proposed algorithm.
A Study on the Brake Regulation Point to Obey Velocity Limits for Entering Speed Restriction Regions in the Distance to Go System
Kim, Tae-Kyu ; Lee, Jong-Woo ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 426~438
DOI : 10.7782/JKSR.2015.18.5.426
Train speed controlling systems are now changing from wayside systems to onboard signaling systems. Locomotive engineers refer to wayside markers to decide on a braking point when the train speed appears to be lower than the current speed. However, in the onboard signaling systems that have been installed recently, the braking point is not determined by the wayside signal but by an onboard value. In this paper, we studied braking points and methods for deciding on such points by engineers using the onboard systems. An optimized braking point is proposed via simulation of decelerating velocity to control the velocity in the signaling system through a predefined point; Gaussian distributions are used to simulate the actual situation. We estimated and demonstrated how to obtain braking parameters in order to satisfy the interval of permitted error.
A Design Solution for a Railway Switch Monitoring System
Choo, Eun-Sang ; Kim, Min-Seong ; Yoo, Heung-Yeol ; Mo, Choong-Seon ; Son, Eui-Sik ; Park, Seongguen ; Lee, Jong-Woo ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 439~446
DOI : 10.7782/JKSR.2015.18.5.439
The turnout system, which determines the direction of the train, is not only a key system but also a vulnerable system. Failure of this system may lead to a delay of the train or even casualties. In this light, it is necessary to precisely the conditions of the turnout system. Currently, ROADMASTER of Germany is used as a diagnostic system in Korea. However, a new diagnostic system should be developed for optimized operation of the turnout system with maintenance that is suitable for the Korean railway environment. In this paper, a Fault Tree Analysis for the representative faults of the turnout system is conducted and physical quantities, which can be the cause of the fault, are classified according to the component and function. Also, the measuring factors for the monitoring are derived and a decision making theory is suggested. On the basis of the results, we propose a new turnout diagnostic system that can provide more driverse and precise information than the conventional system.
Kinematic Modeling of a Track Trolley Using Extended Kalman Filter
Lee, Jun S. ; Choi, Il Yoon ; Kim, Sun Hee ; Um, Ju Hwan ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 447~456
DOI : 10.7782/JKSR.2015.18.5.447
Continuous as well as discrete measurement of the track geometry based on a track trolley are investigated to enhance the efficiency of the trolley and to minimize the measurement errors. A new kinematic model based on the track coordinates involving transition and circular curves is developed to improve the accuracy of the measurement; a nonlinear Extended Kalman Filter (EKF) is employed to linearize the governing equations. The proposed model is verified with the ideal track geometry in terms of both discrete and continuous measurement. Comparison with the previous models is also made to prove the applicability of the kinematic model.
Evaluation of Optimal Horizontal Alignment Considering Ride Comfort in Renewal of Curved Tracks
Um, Ju-Hwan ; Choi, Il-Yoon ; Lee, Jun S. ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 457~465
DOI : 10.7782/JKSR.2015.18.5.457
A method of evaluating the optimal alignment range while considering ride comfort when performing line renewal of curved tracks for speed-up is proposed in this study. The proposed method was applied to analyze the optimal renewal range for horizontal alignments with the smallest curve radii in the Kyung-Bu high-speed line; a parametric study on the effects of various initial design conditions on the permissible renewal range and optimal alignment range was also performed. From the analysis results, it was found that the permissible range is enhanced in proportion to the increase in the curve radius and the cant. It was also verified that a slight adjustment of the horizontal alignment enables speed-up even in the case of R7000/R8000, placed in the ballasted track section of the Kyung-Bu high-speed line.
Study on the Application of the Fenton Oxidation Method for Remediation of Small-scale Oil-contaminated Ballasts on Railroad Track
Kwon, Tae-Soon ; Lee, Jae-Young ; Kim, Hee-Man ; Jung, Woo-Sung ; Kim, Jong-Heun ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 466~470
DOI : 10.7782/JKSR.2015.18.5.466
In this study, Fenton oxidation was applied to railroad track ballasts contaminated with small amounts of oil. In order to perform the experiment on Fenton oxidation, petroleum contaminated ballast was collected from the railroad track and experiments on major factors of the remediation process were implemented in the laboratory. Then, the feasibility of insitu Fenton oxidation was investigated for the railroad track that was partially contaminated with oil. As a result, the residual TPH concentration of ballast was reduced to about 1,000 mg/kg-ballast in laboratory experiments using 0.1 mol Fe/L
. Due to the drainage structure of the track bed, a considerable amount of
was released below the ballast without the sufficient reaction with the contaminated ballast; therefore, additional studies are necessary for the effective field application of Fenton oxidation.
A Comparison Study on the Parcel Transport Service Model-using High-Speed Passenger/Freight Mixed Train
Yum, ByongSoo ; Ha, Ohkeun ; Lee, Jinsun ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 471~480
DOI : 10.7782/JKSR.2015.18.5.471
Reliance on road transport in domestic logistics can lead to intensified congestion and greenhouse gas emissions due to the rise in oil prices, any increase in logistics costs can have a high social cost. The government policy on Low Carbon Green Growth is seeking to take advantage of the railway system. However, existing railway transport logistics systems, for reasons such as low speed, low track capacity constraints, and the impossibility of implementing a Door to Door system, make it difficult to activate a railway logistics program. As a result of this study, a national R&D project to develop a High-Speed Passenger/Baggage Mixed Train(Hy-SoBex) utilizing the rail capacity constraints to overcome the difficulties of linking an air cargo and freight railway logistics system, we propose a variety of service models and select the optimal service model.
Trip Generation Analysis Using Mobile Phone Data
Kim, Kyoungtae ; Lee, Inmook ; Min, Jae Hong ; Kwak, Ho-Chan ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 481~488
DOI : 10.7782/JKSR.2015.18.5.481
The recent trend in transportation planning information is to reduce traffic survey costs and enhance accuracy by using and converging various sources of external data. In Korea, mobile phone data can help generate useful transportation planning information, thanks to the universal use of mobile phones, which are present in a number greater than that of the population. This paper addresses measures to derive trip generation information from mobile phone data and verifies the value of the system for practical use by correlation analysis with KTDB trip generation data. The results show that trip generation information produced by mobile phone data correlates with existing (KTDB) trip generation data.
A Study on the Gilhoe Line Construction and the Consignment of the North Korean Railroad by the South Manchuria Railways
Lee, Yongsang ; Chung, Byunghyun ; Bae, Eunsun ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 489~501
DOI : 10.7782/JKSR.2015.18.5.489
This paper analyses the decision process of the Gilhoe Line construction of the Manchurian Railway and consignment process of the North Korea Line to the South Manchuria Railways as part of the 12-year Chosun railway plan. It was found that these two events were connected and could be explained by Japan's consistent continental policy, which had expanded its territory toward China. This paper explicates Japan's railroad policy and the characteristics of the Chosun railway. Moreover, evidence to identify connections among Japan's national railway, the Manchurian railway, and the Chosun railway has been scrutinized. One territory policy between Chosun and Manchuria is also examined. Comparison of new resources on the Gilhoe Line construction of the Manchurian railway and the 12-year plan of the Chosun railway, and their correlations, is expounded. This paper elucidates that the Gilhoe Line construction and the North Korea line consignment operation by the South Manchuria Railways had the intention of obtaining Japanese military and economic supremacy over East Asia.
Customer Satisfaction Analysis for Urban Railway Service Quality by IPA Analysis
Kim, Heung-Chul ;
Journal of the Korean society for railway, volume 18, issue 5, 2015, Pages 502~511
DOI : 10.7782/JKSR.2015.18.5.502
The purpose of this study is to prioritize the importance of urban railway service quality through statistical analysis. This was done to maximize customer satisfaction by providing customers of urban railway services (including LRT), operated by the local government, with a better customized service quality. It was hoped that this project would boost the need for public transportation by increasing customer satisfaction, which would eventually lead to more profitable revenue. The results of validity certification of expectations and perceptions before and after the use of government funded urban railway and private sector invested urban railways show that there are gaps for 18 items for the government funded urban rail projects (p<.01), while there is no significant difference for 2 items between expectation and perception (p>.05); private sector invested urban railway projects show differences for all 20 items (p<.001). Therefore, IPA analysis is conducted to improve the service quality; this should lead to a remedy that focuses on service quality. The findings of this study will contribute to providing management strategies for boosting customer satisfaction and creating revenue through customized service quality in the urban railway operating industry (including LRT), which is currently suffering from chronic deficits.