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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
A study on Profile Measurement for Railway Wheels using High Speed Camera and Vision Technology
Won, Si-Tae ; Kwon, Seok-Jin ; Huh, Sung-Bum ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 1~7
DOI : 10.7782/JKSR.2015.18.1.1
Maintenance and repair devices used for the inspection of the main parts of domestic railway vehicles have been imported from abroad. Especially, one of the representative domestic devices, the `Wheel Profile Inspector System (WPIS)`, was made by benchmarking foreign devices; this vehicle has been operated in the field. However, problems such as the reliability and performance of the WPIS in operation have appeared. In this study, in order to improve the precision and reliability of the WPIS for maintenance and inspection of railway vehicle wheels, the researchers improved the railway vehicle`s WPIS by applying high-speed vision camera technology and an optimized image algorithm. The test results show that the reliability of the developed WPIS improved by approximately 10.4% compared to that of the conventional system.
Prediction Method and Characteristics of Micro-pressure Wave on High-speed Railway Tunnel
Yun, Su-Hwan ; Nam, Seong-Won ; Kim, Seok-Won ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 8~14
DOI : 10.7782/JKSR.2015.18.1.8
This paper describes a prediction method for micro-pressure wave emitted from a tunnel on the Kyung-bu high-speed railway. Pressure and micro-pressure wave were measured simultaneously to obtain some constants for the prediction method. The change of a micro-pressure wave were analyzed according to the speed of the train, the track bed type, and the distance from a tunnel portal. At a train speed of 300km/h, the micro-pressure wave of 4.0km long ballast track tunnel is about 7.5Pa; that of 3.3km long slab track tunnel is about 14.3Pa The strength of the micro-pressure wave decreases in inverse proportion to the distance and becomes about 0.5~1.0Pa at a point of 100m from the tunnel exit. Micro-pressure waves were predicted using the formula with the obtained the constants. Using a comparison between the predicted data and field measurement data, it was confirmed that micro-pressure wave can be predicted easily through the prediction formula.
Levitation Control Simulation of a Maglev Vehicle Considering Guideway Flexibility
Han, Jong-Boo ; Lim, Jaewon ; Kim, Chang-Hyun ; Han, Hyung-Suk ; Kim, Sung-Soo ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 15~24
DOI : 10.7782/JKSR.2015.18.1.15
In magnetic levitation vehicles, the clearance between the magnet and track should be maintained within an allowable range through a feedback control loop. The flexibility of the guideway would introduce additional modes in the overall suspension system, resulting in dynamic interaction between the guideway vibration and the electromagnetic suspension control system. This dynamic interaction can be a serious problem, particularly at very low speeds or standstill, and may cause airgap instability. To optimize the overall system dynamics, an integrated dynamic model including mechanical and electrical parts and a flexible guideway as well as a control loop was developed. With the proposed model, airgap simulations at standstill were performed while varying the control gains, specifically with the aim of understanding the effects of gains of the PID controller on the airgap variation. The findings may be used to achieve a stable levitation controller design.
Diagnosis of Local Traffic Controller for Effective Operation of Trams at Signalized Intersection
Kim, Jin-Tae ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 25~32
DOI : 10.7782/JKSR.2015.18.1.25
It has been subject to question whether a conventional traffic signal controller can support efficient operation at grade intersections in which vehicles and tram lines cross concurrently. This study proposes a list of functional requirements for a traffic signal controller to support effective operation of trams at such an intersection. The considered details includes the combinations of geometric conditions at which vehicle, bus, and tram lines are aligned, the types of exclusive tram signals, and the combinations of various signal phases, including exclusive tram phases, which are currently undefined in the nation. The results suggest that the controller should be capable of dealing with the NEMA standard overlap relays and a quadruple-ring phase representation scheme.
Conformity Assessment of Vertical Static Stiffness Test Method for Rail Pad
Bae, Young-Hoon ; Kim, Man-Cheol ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 33~42
DOI : 10.7782/JKSR.2015.18.1.33
The vertical static stiffness of rail pads or baseplate pads, which are important components in rail fastening systems for track safety, is a key factor to determine the total track stiffness and a guideline of quality control in the manufacturing process. The vertical static stiffness can be checked by laboratory testing: test methods are EN 13146-9 and KRS TR 0014, which are widely used in the railway field. In this paper, to correct some problems, namely the preloading step, the unloading level, and the holding time in the loading program in the vertical static stiffness test of EN 13146-9 and KRS TR 0014, domestic and foreign test standards of pads were analyzed and then certain schemes for a vertical static stiffness test were proposed. To assess the reliability of the proposed schemes, the vertical static stiffness tests were performed with 4 pads and the validity of the test results was estimated.
Optimal Vertical Stiffness of Fastener of Concrete Track in High-Speed Railway
Yang, Sin-Chu ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 43~52
DOI : 10.7782/JKSR.2015.18.1.43
In this study, to minimize both the costs associated with track maintenance and the energy consumption for train operation, a numerical method that evaluates the optimal vertical stiffness of a fastener for concrete track is presented. A progress model of the track damage is established in order to calculate the concrete track maintenance cost according to the fastener stiffness. Also, the quantitative relationship between the progress of the track damage and the maintenance of the concrete track is derived. The wheel load is more exactly evaluated by using the advanced vehicle-track interaction model, which can precisely consider the behaviors of the track components. An optimal range for the stiffness of the fastener, a range that is applicable to the design of concrete track for domestic high speed lines, is proposed.
Correction Factors for Modulus Calculation Equation used in Light Weight Deflectometer Considering Track Foundation
Choi, Chan Yong ; Lee, Jin Wook ; Lim, Yuijn ; Cho, Hojin ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 53~62
DOI : 10.7782/JKSR.2015.18.1.53
LWDT was developed for use as an alternative technique to measure the stiffness of trackbed soils. In this study, numerical and theoretical analyses of LWDT`s acting mechanism were performed. The effectiveness of the adapted elastic formula used for calculation of the dynamic modulus, Evd, was investigated theoretically and also numerically by running ABAQUS analysis. The minimum thickness of the upper layer is proposed based on the analysis. Correction factors for the formula of elastic modulus are also proposed in this study. In the future, following field test results and laboratory mechanical tests such as the resonant column test, a guideline for the use of LWDT as a standard test protocol in track construction sites, as a measuring tool for the degree of compaction and/or stiffness and dynamic modulus, will be proposed based on this analysis.
Characteristics of Track Irregularities on Kyoungbu High-speed Line
Choi, Il-Yoon ; Lee, Jun S. ; Um, Ju-Hwan ; Kang, Tae-Ku ; Choi, Min-Ji ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 63~70
DOI : 10.7782/JKSR.2015.18.1.63
Track irregularities have a strong influence on the safety and the ride comfort of trains as well as track maintenance work. A statistical analysis was conducted for track irregularities data measured in Kyoungbu high speed line using a track recording car(EM120). First, the characteristics of EM120, which adopted versine measurement system, were investigated and the transfer function of EM120 was examined. The distributions of the surface and the alignment which have short wavelength were considerably high and the distribution decreased as wavelength increases. A distribution analysis of the wavelength was carried out according to EN standards and most of the track irregularities were in a D1 wavelength range. The distributions of the amplitude of track irregularities were also investigated and the results show that the distributions of track irregularities decrease rapidly as amplitude increases. These results may be helpful in making track maintenance plans and revising track irregularities criteria.
A study on the Effects and Improvements of a Train Drivers` Licensing System
Lee, Chan-Bong ; Park, Jin-Pyo ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 71~80
DOI : 10.7782/JKSR.2015.18.1.71
During normal subway rush hours, a train-driver is in charge of more than 3,000 people on a daily basis. When an emergency event occurs, millions of people and their property come to depend only on the train-driver`s ability. After the Daegu subway fire disaster in February 2003, the Railway Safety Act was enacted in October 2004 and the `Train Drivers` Licensing System` was introduced by the National Railroad Administration in July 2006 to secure and improve protection. This study was conducted to investigate and evaluate the effects of the Train Drivers` Licensing System since the Licensing System was first introduced eight years ago. In addition, the analysis will suggest better policies for the effectiveness of the `Train Drivers` Licensing System`.
A Study on the Applicability of LCC as a Railway Assets Management Tool
Kim, Chung-Soo ;
Journal of the Korean society for railway, volume 18, issue 1, 2015, Pages 81~86
DOI : 10.7782/JKSR.2015.18.1.81
Assets are an essential part of a railway financial position and income state. The Railway industry, SOC, has characteristics of possessing vast tangible assets and incurring vast asset-related-costs. For higher liquidity and profitability, the railway industry need more active asset management. Since 2011, IFRS has its changed accounting method for tangible assets, this has subsequently affected asset management. As the railway industry has a high portion of tangible assets, the accounting method for tangible assets is very important. This paper analyzes the newly adopted accounting method for tangible assets and proposes LCC for effective asset management.