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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
Magnetic Levitation Control through the Introduction of Bogie Pitch Motion into a Control Law
Ha, Chang-Wan ; Kim, Chang-Hyun ; Jo, Jeong-Min ; Lim, JaeWon ; Han, Hyung-Suk ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 87~93
DOI : 10.7782/JKSR.2015.18.2.87
The uneven reaction surface profile facing the lift magnets in attractive Maglev vehicles naturally brings about pitch motion of the bogie. In particular, in the placement configuration of the long stator of the linear synchronous motor (LSM) on the track for high-speed propulsion, surface irregularities and the offsets between the stator packs create measurable airgaps, i.e., the clearance between the magnet and the stator, with discontinuously extreme values, resulting in bogie pitch motion. This occurs because the airgap velocities and accelerations derived by the differentiations of the measured air-gaps are used to determine the voltages applied to the magnets. This paper incorporates bogie pitch motion into a control law for each magnet controller to reduce the variations in both the airgap and the pitch angle. The effectiveness of the proposed method is analyzed using a full-scale Maglev vehicle running over a test track.
Study on the Introduction of Tram Driving Qualifications
Choi, Yang-Gyu ; Lee, Jong-Seock ; Baek, Joo-Hyun ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 94~104
DOI : 10.7782/JKSR.2015.18.2.94
Trams are rail vehicles that run on tracks along public, urban streets; they also sometimes run on separate rights of way. Tram vehicles run more efficiently and their overall operating costs are lower than those of similar vehicles. In general, trams provide a higher capacity service than buses. However, when tram stops in the middle of the road do not have pedestrian refuges, trams can cause speed reductions for other transport modes (buses, cars), as in such configurations other traffic cannot pass whilst passengers are alighting from or boarding the tram. In this study we examined the qualifications of overseas tram operation. The Railway Safety Act, sub-laws, and other relevant laws were examined to determine complementary measures.
Design of Beam-forming Reader Antenna for Train Position Detection using RFID
Ahn, Chi-Hyung ; Cho, Bong-Kwan ; Ryu, Sang-Hwan ; Oh, Soon-Soo ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 105~110
DOI : 10.7782/JKSR.2015.18.2.105
This paper presents a
beam-forming reader antenna system for a new type of RFID based train position detection technology. The required beamwidth of the reader antenna is analytically expressed for different train speeds. The proposed antenna system consists of four rectangular patch elements and two switching couplers which are designed, without any impedance matching networks, for two different antenna modes. The switching coupler is a rectangular quadrature coupler with Pin diodes connecting its center line and the ground plane. The beamwidth of the antenna when the diodes are off and on is
, respectively. The proposed antenna system will be used for a real train test in the near future.
Conceptual Design for Lifetime Test System for LED Headlamps on Rolling Stock
Ohn, Jung-Ghun ; Jeong, Ki-Seok ; Chung, Jong-Duk ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 111~116
DOI : 10.7782/JKSR.2015.18.2.111
LED luminaires as a lighting system have attracted much research attention due to their high efficiency and long lifetimes. However, disappointing outcomes have been noted in terms of performance levels and lifetimes as compared to desired system requirements in practice due to certain electrical and thermal characteristics of LEDs. LM-80 and TM-21 established by IESNA are the best known standards for lifetime test procedures and estimation techniques. However, they only handle LED light sources without guaranteeing the LED luminaire in a reliability test. They also operate for more than 6,000 hours and undergo various stresses, such as the operating current and temperature. Therefore, a lifetime standard for LED luminaires has not yet been established. This paper proposes a conceptual design of a lifetime test system for LED headlamps depending on the operating environment. Eventually, this method can assist with evaluations of the validity of lifetime standard tests of LED headlamps.
Analysis of Design Parameters for Earthwork/Bridge Transition Structure for Ultra-High Speed Running
Lee, Il-Wha ; Lee, Sung-Jin ; Lee, Su-Hyung ; Lee, Kang-Myung ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 117~126
DOI : 10.7782/JKSR.2015.18.2.117
The development of railway roadbed for 600km/h train speed level is very difficult because unpredictable static and dynamic interaction occurs between the ultra-high speed train and the infrastructure. Especially, an earthwork-bridge transition zone is a section in which influential factors react, such as bearing capacity, compression, settlement, drainage, and track irregularity; these interactions can include complicated dynamic interaction. Therefore, if static and dynamic stability are secured in transition zones, it is possible to develop roadbeds for ultra-high speed railways. In the present paper, design parameters for transition reinforcement applied to present railway design criteria are analytically examined for ultra-high speed usage on a preferential basis. Design parameters are the presence of reinforcing materials, geometric shape, stiffness of materials, and so on. Analysis is focused on the deformation response of the track and running stability at ultra-high speed.
Analysis of Shear Modulus(G)-Shear Strain(γ)-Degree of Saturation(S) Characteristics of Compacted Subgrade Soil used as Railway Trackbed
Choi, Chan Yong ; Lee, Seong Hyeok ; Lim, Yu Jin ; Kim, Dae Sung ; Park, Jae Beom ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 127~138
DOI : 10.7782/JKSR.2015.18.2.127
It is important to evaluate the stiffness characteristics of compacted subgrade soil under track that is loaded dynamically. Using a mid-size Resonant Column test apparatus, normalized shear modulus and shear modulus variation with changing of confining pressure were investigated with change of degree of saturation (DOS). From an analysis of the test results, it was verified that the maximum shear modulus decreased with increases of DOS. However, normalized shear modulus increased with increases of DOS. Using the test results, a relation of G~
~DOS can be constructed and characterized. In the future, by performing tests with soils used as trackbed broadly in the field, a prediction model for DOS~G~
can be proposed.
Evaluation of the Optimal Vertical Stiffness of a Fastener Along a High-speed Ballast Track
Yang, Sin-Choo ; Kim, Eun ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 139~148
DOI : 10.7782/JKSR.2015.18.2.139
By increasing the vertical stiffness of the rail fastening system, the dynamic wheel load of the vehicle can be increased on the ballast track, though this increases the cost of track maintenance. On the other hand, the resistance acting on the wheel is decreased, which lowers the cost of the electric power to run the train. For this reason, the determination of the optimal fastener stiffness is important when attempting to minimize the economic costs associated with both track maintenance and energy to operate the train. In this study, a numerical method for evaluating the optimal vertical stiffness of the fasteners used on ballast track is presented on the basis of the process proposed by L
pez-Pita et al. They used an approximation formula while calculating the dynamic wheel load. The evaluated fastener stiffness is mainly affected by the calculated dynamic wheel load. In this study, the dynamic wheel load is more precisely evaluated with an advanced vehicle-track interaction model. An appropriate range of the stiffness of the fastener applicable to the design of ballast track along domestic high-speed lines is proposed.
Railway Timetable Considering Optimal Path Finding Method in Rail Network (Focused on Revenue Allocation)
Lee, Chang-Hun ; Shin, Seong-Il ; Kim, Si-Gon ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 149~156
DOI : 10.7782/JKSR.2015.18.2.149
It is necessary to determine real path for urban railway users in order to allocate revenues between urban railway organizations. Out of several algorithms used to determine optimal routes, the k-path algorithm based on link-label has been utilized. However, this k-path algorithm has certain flaws. For example, optimal route can change depending on the travel and walking time, transfer penalty, and so on. Also, this algorithm cannot take into account the characteristics of users, who prefer express train to normal trains. In this paper, an algorithm is proposed to determine one single optimal route based on the traffic card data. This method also can search for an optimal path in conjunction with the railway timetable.
A Comparative Study of the Korean, Japanese and Manchurian Railway Policy during the Japan Colonial Period
Lee, Yongsang ; Chung, Byunghyun ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 157~165
DOI : 10.7782/JKSR.2015.18.2.157
At the end of the 19th and in the early 20th centuries, Japan, Korea, and Manchuria, and areas throughout East Asia, suffered a number of cycles of growth and development, for which the railway was a very important development tool and was closely associated with national policy. East Asian affairs, especially at the time, seemed very important to the continent, and their influence on the advance of this remarkable era was especially prominent in Japan. In the midst of this period, the national railway may have evolved under national policy and railway policy and under a variety of organizations and persons of influence. In this paper, we have tried to find the similarities and differences among the three countries that built the East Asia Railway; we consider the characteristics of the East Asia Railway from the perspectives of these three countries. Comparing the characteristics of the three country's railways, first, Japan had the motives of continental expansion and modernization in its pursuit of the railway; in Korea, the railway played the role of a continental rail link; and in Manchuria there was a tendency to pursue direct domination of the railway. Second, the Japanese applied their railway model to Korea; the Korean railway may have been in operation, but it was an extension of the railway of Japan. The railway in Manchuria showed a similar pattern to that which can be found in the state of Asian domination of Europe ; Japan showed aspects of dominance over the railway because it had experience running a private railway.
An Empirical Study of Light Railway Transit Ridership using Socio-economic Data Based on Block Group Level
Lee, Kwang Sub ; Eom, Jin Ki ; Moon, Dae Seop ; Park, Cheol ; Shin, Jong Jin ;
Journal of the Korean society for railway, volume 18, issue 2, 2015, Pages 166~174
DOI : 10.7782/JKSR.2015.18.2.166
A direct demand model requires relatively little analysis time and incurs a low cost. It is also known to be useful for the preliminary screening of promising configurations or concepts. This study reviews direct demand models of 12 existing urban railways using demographic data based on a block group level which is approximately 1/24 of a traditional zone area. However, direct demand models are limited. Therefore, a new approach is suggested. The proposed method is based on a field study and an empirical analysis. The study finds factors that affect ridership at the station level. As a case study, the proposed approach is tested using 54 light railway transit stations. The results of this empirical study demonstrate its applicability to improve the error rates of the predicted ridership at the station level.