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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 19, Issue 4 - Aug 2016
Volume 19, Issue 3 - Jun 2016
Volume 19, Issue 2 - Apr 2016
Volume 19, Issue 1 - Feb 2016
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Study on the Design of Deformation Tube for 200kJ Large Energy Absorption
Kim, Jin Mo ; Lee, Jong Kil ; Kim, Ki Nam ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 109~116
DOI : 10.7782/JKSR.2016.19.2.109
The market share of high-speed railway vehicles is increasing across the world. A high-performance impact energy absorption factor is essential to satisfy the safety standards of railway vehicles. A deformed tube assembly is a typical energy absorption factor in railway vehicles. The tube assembly comprises a deformed tube and a press-fitting punch, its performance depends on the absorption energy characteristics in the plastic zone of the tube. In this study, a deformed tube assembly of a railway vehicle is designed that can absorb a maximum impact energy of 200kJ under plastic deformation. Slab method and finite element analysis are used to estimate the reaction force of the punch in the initial stage, the performance of the designed tube assembly is confirmed experimentally.
Effects of Grid Characteristics on High Speed Circuit Breaker for Railway Vehicle
Park, Ji-Won ; Jung, Jooyoung ; Choi, Jinnil ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 117~123
DOI : 10.7782/JKSR.2016.19.2.117
High speed circuit breakers(HSCB) interrupt the generated arc within the arc chute to turn off the electricity flowing through the main circuit to prevent ground faults. In order to explore the arc generated from the contactor operation, arc definition, establishment of arc interruption method, and analysis of magnetic driving force are required. In this paper, arc interruption capability has been estimated by exploring the difference in magnetic flux density of Lorenz forces using finite element analysis. In addition, since the number of grids and changes in the grid shape within the arc chute influence the formation of the inner magnetic field, its effects have been explored to enhance arc interruption capability. Assessment of interruption capability and analysis of grid shape, with rated operating current, are reported.
Acoustic Performance Evaluation and Prediction for Low Height Noise Barriers Installed Adjacent To Rails Using Scale Down Model
Yoon, Je Won ; Jang, Kang Seok ; Cho, Yong Thung ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 124~134
DOI : 10.7782/JKSR.2016.19.2.124
Research on low height noise barriers installed adjacent to railways to reduce the height of the noise barrier has actively progressed in many countries except Korea. The performance of low height noise barriers is evaluated to identify barrier acoustic characteristics using a scale model of the barrier in the present research. As shown in the experimental results, if it is considered the installation of `ㄱ` type noise barrier, sound absorption material should be installed on both the top and the vertical surfaces of the barrier to improve insertion loss. Also, an analytical method such as the boundary element method, rather than a simple empirical equation, is required to evaluate the insertion loss of the barrier. In addition, noise level increase in passenger position is very small if a barrier with sound absorption material is installed. Finally, the two dimensional boundary element method is implemented to predict the acoustic characteristics of the low height barrier; the possibility of the application is confirmed from a comparison of the results of measurements and predictions.
Parametric Study on 3-way Switch Design Considering Levitation Stability of Maglev Train
Lee, Younghak ; Han, Jong-Boo ; Lim, Jaewon ; Lee, Jong-Min ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 135~144
DOI : 10.7782/JKSR.2016.19.2.135
It is essential to lighten the weight of switch girders in order to reduce their costs of manufacturing and make it easier to use them in construction. Lightening the weight of switch is also important to the Maglev 3-way switches system, however, the design variables should be considered very carefully if lightening is to be applied to the system, because these variables are vitally related to the levitation stability. Because Urban Maglev trains have a structure in which train bogie wraps around the guiderail, the adjustment of a girder`s height is a possible way to reduce the weight. The safety of the application of this concept is ensured by repeated experiments in a test bed, however, due to a lack of space and budget limits, the design parametric study for the system model can substitute for actual application. The purpose of this paper is to study the design parameters that are concerned with levitation stability while a Maglev train is running on the Maglev 3-way system depending on the weight of the switch girders. In this study, switch girder weight is reduced by adjustment of girder height and girders are and modeled as a flexible body. The effect of the adjustment of girder height on the levitation stability can be analyzed by comparing the velocity of the train when it passes the switch girders, with the lateral gap, and the levitation gap which are obtained from the co-simulation of the Maglev train`s dynamics model and flexible switching system. The results of this research will be used to design a Maglev switch.
A Study on SIL Allocation for Signaling Function with Fuzzy Risk Graph
Yang, Heekap ; Lee, Jongwoo ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 145~158
DOI : 10.7782/JKSR.2016.19.2.145
This paper introduces a risk graph which is one method for determining the SIL as a measure of the effectiveness of signaling system. The purpose of this research is to make up for the weakness of the qualitative determination, which has input value ambiguity and a boundary problem in the SIL range. The fuzzy input valuable consists of consequence, exposure, avoidance and demand rate. The fuzzy inference produces forty eight fuzzy rule by adapting the calibrated risk graph in the IEC 61511. The Max-min composition is utilized for the fuzzy inference. The result of the fuzzy inference is the fuzzy value. Therefore, using the de-fuzzification method, the result should be converted to a crisp value that can be utilized for real projects. Ultimately, the safety requirement for hazard is identified by proposing a SIL result with a tolerable hazard rate. For the validation the results of the proposed method, the fuzzy risk graph model is compared with the safety analysis of the signaling system in CENELEC SC 9XA WG A10 report.
Data Collection Methods to Standardize Protocols of Safety Supervision System
Shin, Kwang-Ho ; Um, Tae-Hwa ; Lim, Dam-Sub ; Ahn, Jin ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 159~169
DOI : 10.7782/JKSR.2016.19.2.159
The current railway control system in Korea is comprised of signaling, electric rail power, communication, and maintenance systems that are independent of each other. Further, these systems have different mediums and protocols for transmitting the field equipment data to the central control system. The Safety Supervision System has as its purpose the collecting of safety-related data from each system to predict and prevent accidents, this system utilizes standard protocol. Safety-related data need to be collected from field data transmission devices of the existing control system, the data should be collected without affecting the communication of the existing system. In this study, sniffing skill, which is typically used for network traffic monitoring or security, is used to collect data. The problems arising from the use of sniffing devices are noted, and the Packet Conversion Node is proposed as a solution to the problems. Further, functional and performance testing were completed for the prototype, and the software architecture and packet conversion process were verified.
A Study of SIL Allocation with a Multi-Phase Fuzzy Risk Graph Model
Yang, Heekap ; Lee, Jongwoo ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 170~186
DOI : 10.7782/JKSR.2016.19.2.170
This paper introduces a multi-phase fuzzy risk graph model, representing a method for determining for SIL values for railway industry systems. The purpose of this paper is to compensate for the shortcomings of qualitative determination, which are associated with input value ambiguity and the subjectivity problem of expert judgement. The multi-phase fuzzy risk graph model has two phases. The first involves the determination of the conventional risk graph input values of the consequence, exposure, avoidance and demand rates using fuzzy theory. For the first step of fuzzification this paper proposes detailed input parameters. The fuzzy inference and the defuzzification results from the first step will be utilized as input parameters for the second step of the fuzzy model. The second step is to determine the safety integrity level and tolerable hazard rate corresponding to be identified hazard in the railway industry. To validate the results of the proposed the multi-phase fuzzy risk graph, it is compared with the results of a safety analysis of a level crossing system in the CENELEC SC 9XA WG A0 report. This model will be adapted for determining safety requirements at the early concept design stages in the railway business.
Flexural Reliability Assessment of PSC-I Girder Rail Bridge Under Operation
Kim, Ki Hyun ; Yeo, Inho ; Sim, Hyoung-Bo ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 187~194
DOI : 10.7782/JKSR.2016.19.2.187
It is necessary to determine reliability indexes of existing railway bridges prior to setting up a proper target reliability index that can be used to introduce a reliability based limit state design method to design practice. Reliability is evaluated for a six PSC-I girder railway bridge, which is one of many representative types of double-track railway bridges. The reliability assessment is carried out for an edge girder subjected to bending moment. In the assessment, the flexural resistance and the fixed-load effect were obtained using existing statistical values from previous research on the introduction of limit state design to road bridge design. On the other hand, the live-load effect was determined using statistical values obtained from field measurement for the Joong-ang corridor, on which heavy freight trains are frequently passing. The reliability assessment is performed by AFOSM(Advanced First Order Second Moment method) for the limit state equation, and a sensitivity analysis for the reliability is performed for each factor of the load and resistance effects.
Analysis of the Relationship between Concrete Slab Track Life and Secondary Compression Characteristics in Soft Clay
Lee, Sang-Cheol ; Cho, Kook-Hwan ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 195~203
DOI : 10.7782/JKSR.2016.19.2.195
Concrete slab track was applied to the Gyeoungbu High Speed Railroad step 2 and the Honam High Speed Railroad. Concrete slab track incurs higher construction cost and lower maintenance cost than existing gravel track. For these reasons, the use of concrete slab track has increased in Korea. The biggest problem in the use of concrete slab track is repairing damage from settlement that can occur while trains are in service. High speed railroad design standards require allowable residual settlement of concrete slab track of less than 25mm. In order to satisfy the requirement of long term stability of concrete slab track, it is necessary to manage the secondary compression settlement within the allowable residual settlement. This study is to evaluate the secondary compression settlement with the variation of the secondary compression index, thickness of soft ground, and concrete slab track life. Statistical analysis is performed to determine the probability of distribution of areas where serious problems will be caused after the concrete slab track is constructed.
Construction of Correlation between Basic Soil Properties and Deformation Modulus of Trackbed Soils Based on Laboratory and Field Mechanical Tests
Park, Jae Beom ; Choi, Chan Yong ; Ji, Sang Hyun ; Lim, Sang Jin ; Lim, Yu Jin ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 204~212
DOI : 10.7782/JKSR.2016.19.2.204
The soils used as trackbed in Korea are selected using USCS utilizing basic soil properties such as Grain Size Distribution(GSD), % passing of #200 sieve (
), % passing of #4 sieve (
), Coefficient of uniformity (
), and Coefficient of curvature (
). Degree of compaction of the soils adapted in the code by KR should be evaluated by maximum dry density (
) and deformation modulus
. The most important influencing factor that is critical to stability and deformation of the compacted soils used as trackbed is stiffness. Thus, it is necessary to construct a correlation between the modulus and the basic soil properties of trackbed soil in order to redefine a new soil classification system adaptable only to railway construction. To construct the relationship, basic soil test data is collected as a database, including GSD, maximum dry unit weight (
, etc.; deformation modulus
are obtained independently by performing a Repeated Plated Bearing Test (RPBT) and Light Weight Deflectometer Test (LWDT) for ten different railway construction sites. A linear regression analysis is performed using SPSS to obtain the relationship between the basic soil properties and the deformation modulus
. Based on the constructed relationship and the various obtained mechanical test data, a new soil classification system will be proposed later as a guideline for the design and construction of trackbed foundation in Korea.
Laboratory Experimental Test of the Applicability of a Trench Shield Machine for Open-cut Excavation Technology
Lee, Young-Min ; Sagong, Myung ; Kim, Cheol-Han ; Song, Seung-Chul ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 213~223
DOI : 10.7782/JKSR.2016.19.2.213
Traffic jams occur frequently due to the dense populations of cities. Accordingly, the discomfort of citizens has increased. In order to minimize traffic inconveniences, various public transportation facilities have been suggested. In this paper, for the economical construction of a near-surface railway system, the design of a trench shield is developed and a review of its applicability is done by creating and testing trench shield equipment on a small scale. The trench shield consists of an excavation part, a shield part and an advancement part. To examine the applicability of the trench shield, a laboratory test is carried out. The results of the laboratory test confirm the possibility of reducing the construction time at open-cut construction sites through the excavation of the trench shield. Although the laboratory test is an indoor and relatively small-scale experiment, it is considered to be possible to secure a construction speed of 3m/day when the trench shield equipment is used.
Investigation of the Bond and Deformation Characteristics between an Asphalt layer and a Concrete Slab used as the Trackbed Foundation of an Embedded Rail System for Wireless Trams
Cho, Hojin ; Kang, Yunsuk ; Lee, Suhyung ; Park, Jeabeom ; Lim, Yujin ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 224~233
DOI : 10.7782/JKSR.2016.19.2.224
Embedded Railway Systems (ERS) will be adapted for wireless trams and will be constructed along city roadways. An asphalt layer should be overlaid on top of the concrete slab used as the trackbed structure in order to ensure smoothness and surface levels equal to those of existing road pavement in downtown city areas. However, the characteristics of an asphalt layer when used as overlay pavement for an ERS are complicated and the behavior of this material is not yet well defined and understood. Therefore, in this study, laboratory shear and tensile bond strength tests were conducted to investigate the bonding behavior of an asphalt layer in a multilayered trackbed section of an ERS. For the laboratory tests, a waterproof coating material was selected as a bonding material between the asphalt overlay and a concrete specimen. Valuable design parameters could be obtained based on the tensile and shear bond strength test results, providing information about the serviceability and durability of the overlaid pavements to be constructed alongside the ERS for wireless trams. In addition, a deformation analysis to assess the tensile strain generated due to truck axle loads at the interface between the asphalt layer and the concrete slab was conducted to verify the stability and performance of the asphalt layer.
Study on Optimization for Scheduling of Local And Express Trains Considering the Application of High Performance Train
Kim, Moosun ; Kim, Jungtai ; Ko, Kyeongjun ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 234~242
DOI : 10.7782/JKSR.2016.19.2.234
In express operation plans for urban trains, it is effective for the reduction of the number of sidetracks to apply a high performance train that has improved acceleration/deceleration ability and a regular train to local and express trains, respectively. In this research, based on a plan to use a high performance train for a local train, an optimization methodology is suggested to reduce the number of sidetracks and the operation time of the local train simultaneously. The optimization solver applied in this research is a genetic algorithm; headway, location of sidetrack and waiting time at the sidetrack are considered as design variables in the optimization problem. Consequently, by applying this system to Seoul metro line no.7, the effect of the suggested methodology was verified by obtaining the proper optimum solution.
Multidimensional Scaling Analysis of Inter-regional Public Transit Services: Focusing on Inter-regional Railways
Kwon, Yeongmin ; Jang, Kitae ; Jang, In Gwun ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 243~250
DOI : 10.7782/JKSR.2016.19.2.243
As sustainable growth has been emphasized in the field of transportation, the railway system has been promoted as an environmentally-friendly transport mode. However, mode shifts from other transport modes to railway have been sluggish. In this context, to enhance the understanding of railway`s competitive advantages and disadvantages, this research evaluates travelers`preferences for public transport modes for inter-regional trips: such understanding should make it possible to formulate effective policy for promoting railways. To this end, passenger recognition of competitive transport modes has been measured by applying multidimensional scaling analysis for six major inter-regional public transport services - KTX, ITX-Samaeul, Mugunghwa-ho, premium express bus, general express bus, and airline. As a result, we can conceptualize the recognition similarity in two-dimensional space, and understand how travelers perceive the six major transport modes.
A Study on Gradual Changes in Railway Organization During Japanese Colonial Period
Lee, Yongsang ; Chung, Byunghyun ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 251~261
DOI : 10.7782/JKSR.2016.19.2.251
In this paper, changes of railway-related organization during the Japanese colonial period were studied indepth. The railway-related organizations were expanded from the Railway Management Bureau in 1906 (Residency-General). In 1910, this bureau changed to the General of Chosun Railway Bureau (Government-General) and the Chosun Railway Bureau (Government-General). In the 1940`s, it developed into an organization called the Transport Bureau, dealing with the whole transport service. The number of employees in the railway sector increased along with the expansion of the organization and the establishment of a training institution for better recruitment. After examining the period of the construction of railway and connection system, which is deeply related to the railway organizations of the Japanese colonial period, this paper analyzes the transformation process of railway-related laws and organizations. Furthermore, this paper finds common characteristics and differences between railways in a comparison of three countries: Chosun, Japan and Taiwan.
A Study of the Proper Sizing of a Subway Station Waiting Area
Kim, Jonghwang ; Baek, Sungjoon ; Nam, Doohee ;
Journal of the Korean Society for Railway, volume 19, issue 2, 2016, Pages 262~269
DOI : 10.7782/JKSR.2016.19.2.262
Subway station scales are determined by peak predictions. In this study, the purpose behind the installation of a subway is public transportation convenience and public interest, but economic validity is also important. By proving that the scale of the station is excessive with regard to the target station size for Seoul subway Line 5-8, a reasonable plan. can be sought. According to station installation standards, the area of the station under investigation here is out of the service levels by six stages (A~F), and it must be four or more levels (D). The Actual level for the B level is a two-step design. The Actual ratio for over- Peak predictions is only 17.8% on average. The results of measurements of the excess area and determination of the excessive costs were analyzed by subdividing the area and by calculating it based on the B level, finding that it is possible to provide benefits for customers only in the current design, with an area ratio of 16.3%. Given the weight, it was estimated that current conditions can meet the needs of only 18.6% of the current area. Simplifying the scale calculation method of the station, it is convenient, safe, and advantageous to move citizens only if the scale can be streamlined. Then, with a reduced initial investment, maintenance costs during the operation can be reduced.