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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Railway
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Korean Society for Railway
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Volume & Issues
Volume 8, Issue 2 - Jun 2015
Volume 8, Issue 1 - Mar 2015
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Evaluation of Field Calibration Test on Rail for Train Wheel Force Measurement
Sim, Hyoung-Bo ; Yeo, Inho ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 1~4
DOI : 10.7782/IJR.2015.8.1.001
An accurate measurement of the train-track interaction forces is important for track performance evaluation. In the field calibration test as a wheel load measurement process, the calibration system creates a different boundary condition in comparison with that in the train wheel passage. This study aims to evaluate a reliability of the field calibration test in the process of wheel load measurement. Finite element models were developed to compare the deformed shapes, bending moment and shear force profiles on the rail section. The analysis results revealed that the deformed shapes and their associated bending moment profiles on the rail are significantly different in two numerical simulations of the calibration test and the train wheel load passage. However, the shear stress profile on the rail section of the strain gauge installation in the field was almost identical, which may imply that the current calibration test is sufficiently reliable.
Sensitivity Analysis by Parametric Study of Load Factor for a Concrete Box Girder Railway Bridge Using Limit State Design
Yeo, Inho ; Sim, Hyung-Bo ; Kim, Daehwan ; Kim, Yonghan ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 5~9
DOI : 10.7782/IJR.2015.8.1.005
Reliability based limit state design method is replacing traditional deterministic designs such as allowable stress design and/or ultimate strength design methods in world trends. European design code(Eurocode) has adopted limit state design, and Korea road bridge design standard has also recently been transferred to limit state design method. In this trend, Korea railroad design standard is also preparing for adopting the same design concept. While safety factors are determined empirically in traditional design, load combinations as well as load factors are determined by solving limit state equations. General partial safety factors are evaluated by using AFORM(Advanced First Order Reliability Method) in the reliability based limit state design method. In this study sensitivity analysis is carried out for a dead load factor and a live load factor. Relative precisions of the dead load and the live load factors are discussed prior to the AFORM analysis. Furthermore the sectional forces of design and the material quantities required by two different design methods are compared for a PSC box girder railway bridge.
The Study on Miniaturization and Weight Reduction of Auxiliary Power Unit in Magnetic Levitation Train
Lee, Na Ri ; Shin, Hee Keun ; Choi, Sung Ho ; Kim, Ju Bum ; Lim, Jae Won ; Park, Doh Young ; Mok, Hyung Soo ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 10~14
DOI : 10.7782/IJR.2015.8.1.010
Due to the characteristics of the vehicle structure, the magnetic levitation train has a confined bottom space thus a study on miniaturization and weight reduction of auxiliary power unit is essential. This auxiliary power unit is an essential device used for illumination, air conditioning, heating and air brake equipment excluding the motor. The previous auxiliary power unit for magnetic levitation train has used the hard switching having a high switching frequency with heavy loss in order to reduce the size of filter reactor and transformer but the reduction in volume was not significant. In this paper, by reducing the loss, reducing the size of the cooling unit and by increasing the switching frequency using the soft switching of resonant converter, it has miniaturized and reduced the weight of filter reactor and transformer which occupy significant space in the auxiliary power unit. This study has verified the performance of 50KVA grade prototype through simulated interpretation and analysis, and compared the size and weight of auxiliary power unit of the previous magnetic levitation train.
Characteristic Analysis of a Linear Induction Motor for 200-km/h Maglev
Jeong, Jae-Hoon ; Lim, Jae-Won ; Park, Do-Young ; Choi, Jang-Young ; Jang, Seok-Myeong ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 15~20
DOI : 10.7782/IJR.2015.8.1.015
As a result of the current population concentrations in urban centers, demand for intercity transportation is increasing rapidly. Railway transportation is becoming popular as an intercity transportation because of its timely service, travel speeds and transport efficiency. Among the many railway systems, the innovative and environmentally friendly maglev system has been rated very highly as the next-generation intercity railway system. Linear induction motors are widely used for the propulsion of maglev trains because of their light weight and low construction costs. The urban maglev that was recently completed in Incheon airport site employs a 110km/h class linear induction motor. However, this system was designed to meet requirements for inner-city operations and is not suitable as an intercity transportation system, which requires medium to high speeds. Therefore, this study deals with the characteristics and designs of linear induction motors used for the propulsion of maglev trains that can be used as intercity trains. Rail car specifications for high-speed trains have been presented, and the characteristics of linear induction motors that can be used for the propulsion of these trains have been derived using the finite element method (FEM).
Development of Redundant Levitation and Guidance Control System of the Urban and Medium to High Speed Magnetic Levitation Train
Cho, Yeon-Hwa ; Lee, Sun-Hee ; Jang, Kyung-Hyun ; Lee, Sang Suk ; Lee, Kyoung-Bok ; Park, Doh-Young ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 21~29
DOI : 10.7782/IJR.2015.8.1.021
This study focuses on the performance enhancement of the levitation and guidance control system in urban and medium-to high-speed magnetic levitation trains. A levitation control system, which is currently being tested in Yeongjongdo, is a single controller that is neither designed nor produced on the basis of redundancy. Hence, vehicular stability and reliability should be improved for the situation in which levitation failure occurs because of a breakdown in a controller during vehicle operation. In addition, the control system should be developed to control electromagnetic levitation considering changes in normal force according to changes in the driving force of the propulsion system.
Maglev(UTM-02) Brake System Change from Pneumatic Bake System to Hydraulic Brake System
Kim, Kinam ; Hwang, Sungwoon ; Jeon, Heekwon ;
International Journal of Railway, volume 8, issue 1, 2015, Pages 30~34
DOI : 10.7782/IJR.2015.8.1.030
The Maglev(UTM-02) project is leading by Korea Institute of Machinery & Materials and financially supported from the ministry of Commerce, Industry and Energy. The early development stagy of Maglev(UTM-02) was adopted the general urban railway pneumatic brake system due to the Korea domestic industrial environment. Currently there is two commercial operation Light Railway Train(LRT) system in Korea. One is U-Line in Uijungbu, and the other is Everline in Yongin. Both LRT systems are adopting high performance light weight hydraulic brake system. But those design and manufacturing core technology of the brake system is came from a major brake system companies located from aboard. Currently various studies have been continued to increase practical application and to improve competitiveness on performance for each sub-system of Maglev. Also in case of brake system, developing competitive hydraulic brake system is required. In this study, we have introduced the development process and performance evaluation of the new hydraulic brake system of Maglev.