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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 12, Issue 6 - Dec 2009
Volume 12, Issue 5 - Oct 2009
Volume 12, Issue 4 - Aug 2009
Volume 12, Issue 3 - Jun 2009
Volume 12, Issue 2 - Apr 2009
Volume 12, Issue 1 - Feb 2009
Selecting the target year
Foster Plan for the Railway Engineers by Activation of Railway Engineering Education System
Park, Eun-Soo ; Koo, Ja-Kyung ; Jun, Young-Joon ; Lee, Tai-Sik ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 1~8
To develop railway industry's competitive, it is necessary to develop the high-quality manpower who will contribute to the public service and the railway business. To achieve this goal, it is required to create the new university curriculum focused on the railway engineering. In near future, it must be required to secure the high-quality railway engineers for. improving and developing its technologies. The purpose of this research is that improving competitive in the railway industry by developing new curriculum for the railway engineers.
Experimental Study on the Designed Ventilation System Performance at Rescue Station in Tunnel Fire
Kim, Dong-Woon ; Lee, Seong-Hyeok ; Ryou, Hong-Sun ; Yoon, Sung-Wook ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 9~15
In this study, the l/35 reduced-scale model experiment were conducted to investigate designed ventilation system performance at rescue station in tunnel fire. A model tunnel with 2 mm thick of steel, 10 m long, 0.19 m high and 0.26m was made by using Froude number scaling law. The cross-passages installing escape door at the center. were connected between accident tunnel and rescue tunnel. The n-heptane pool fire,
, with heat release rate 698.97W were used as fire source. The fire source was located in the center and portal of accident tunnel as Worst case.. An operating ventilation system extracted smoke amount of 0.015 cms. The smoke temperature and carbon monoxide. concentration in cross-passage were measured to verify designed ventilation system. The results showed that, in center fire case without ventilation in accident tunnel, smoke did not propagated to rescue station. In portal tire case, smoke spreaded to rescue station without ventilation. But smoke did not propagated to rescue station with designed ventilation.
A Study on the Fatigue Crack Evaluation Method of Railway Bogie Frame
Jun, Hyun-Kyu ; Seo, Jung-Won ; Lee, Dong-Hyong ; Kim, Hyeong-Jin ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 16~24
In this study, fatigue crack growth rate of a cracked railway bogie frame under variable amplitude loading is predicted by applying linear elastic fracture mechanics. For this purpose, we find the critical points by reference surveying on cracked railway bogie frames. And we make an effective load history by synthesizing the dynamic load measured from the critical points of railway bogie frame during commercial line operation and the static load calculated from structural analysis. Crack growth analyses are performed at the 3 critical points under the commercial operation loading condition by assuming an initial crack size as 40 mm. and the results are compared with the experimental results from Japanese railway bogie frame crack growth case. From the analysis results, we find that around 500,000 km operating distance is necessary to bring crack growth from the initial crack to unstable crack. And it takes around 3.8 normal operating years. We conclude that it is enough time to detect the crack between normal maintenance period.
Numerical Investigation of Smoke Behavior in Rescue Station for Tunnel Fire
Hong, Sa-Hoon ; Ro, Kyung-Chul ; Ryou, Hong-Sun ; Lee, Seong-Hyuk ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 25~30
The present study deals with numerical investigation for smoke behavior in rescue station by using the commercial CFD code (FLUENT Ver 6.3). With the use of the MVHS(Modify Volumetric Heat Source) model modified from the original VHS(Volumetric Heat Source) model, a 10 MW mode was adopted for simulation and the MVHS model can describe the generation of product and the oxygen consumption at the stoichiometric state. In addition, the present simulation includes the species conservation equations for the materialization of heat source and the estimation of smoke movement. From the results, the smoke flows are moving along the ceiling because of thermal buoyancy force and as time goes, the smoke gradually moves downward at the vicinity of the entrance. Moreover, without using ventilation, it is found that the smoke flows no longer spread across the cross-passages because the pressure in the non-accident tunnel is higher than that in the accident tunnel.
Effect of the Rock Characteristics Condition on the Behavior of Tunnel by Numerical Analysis
Kwon, Soon-Sup ; Park, Tae-Soon ; Lee, Jong-Sun ; Lee, Jun-Woo ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 31~38
The selection of the support system is an important design parameter in design and construction of the tunnel using the new Australian tunnel method. It is a common practice to select the support based on the rock mass grade, in which the rock mass is classified into five rock groups. The method is applicable if the characteristics of the rock mass are uniform in the direction of tunnel excavation. However, such case is seldom encountered in practice and not applicable when the properties vary along the longitudinal direction. This study performs comprehensive three dimensional finite difference analyses to investigate the ground deformation pattern for cases in which the rock mass properties change in the direction of the tunnel axis. The numerically calculated displacements at the tunnel crown show that the displacement is highly dependent on the stiffness contrast of the rock masses. The results strongly indicate the need to select the support type
before the rock mass boundary. The paper proposes a new guideline for selecting the support type based the results of the analyses.
Aerodynamic Characteristics of Heighter Shapes for a Tract Gust Reduction
Rho, Joo-Hyhn ; Kim, Jong-Yong ; Ku, Yo-Cheon ; Yun, Su-Hwan ; Kwon, Hyeuk-Bin ; Lee, Dong-Ho ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 39~44
The ballast-flying, induced by strong underbody flow of high-speed train, can damage train underbody, wheel and even cause the safety problems. For this reason, a heighter is being used to prevent ballast-flying through underbody flow reduction. In this research, flow field around a heighter is numerically simulated.. And the parametric study of various heighter geometries is performed to find out more effective heighter shape. Through these numerical studies, the relation between the heighter shape and underbody flow is found out. Also new heighter shapes are numerically investigated and their performances of underbody flow reduction are verified.
Gateway Platform for Connecting D-TRS in Electric Power IT
Song, Byung-Kwen ; Jeong, Tae-Eui ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 45~54
TETRA(Terrestrial Trunked Radio) is the standard of D-TRS(Digital Trunked Radio System) developed by the ETSI(European Telecommunications Standards Institute). Currently, TETRA has been selected as Electric Power IT Wireless Backbone Network. Traditional distribution automation system has used the wireless network of Mobile Service Provider using CDMA(Code-Division Multiple Access) and WCDMA(Wideband CDMA) modem. Therefore, the development of gateway platform is indispensable according to the change to TETRA network. In this paper, we propose an embedded Linux-based Gateway platform for transmitting Industrial Electric Power IT protocol using TETRA network.
Evaluation on Structural Stiffness and Grouting Efficiency of Concrete Track using Elastic Wave Tests
Lee, Il-Wha ; Joh, Sung-Ho ; Jang, Seung-Yup ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 55~64
Recently, concrete track is replacing ballast track for efficient and economic maintenance of track. It considerably offer less maintenance, a longer service life and reduced life-cycle costs. With the aim of achieving high-quality track construction work, of developing tools for quality assurance in new construction and for later technical inspection of material condition, a quality strategy has to be developed. For these purpose, NDT which is using the seismic wave has carried out in situ studies in the test construction section. The used NDT are SASW test, impact echo test and continuous impact echo test. The test is performed 5,353 times on 49 pre-cast concrete track panels to verify the stiffness structure and grouting efficiency of the track structure. To conclude, because of the non-homogeneous characteristic of concrete material. it is restricted to apply the elastic wave test at some aspect. However it is possible to acquisite a sufficient reliability about structural stiffness and grouting efficiency of concrete track.
Assessment of the Pressure Transient Inside the Passenger Cabin of High-speed Train Using Computational Fluid Dynamics
Kwon, Hyeok-Bin ; Nam, Sung-Won ; Kwak, Jong-Hyun ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 65~71
The pressure transient inside the passenger cabin of high-speed train has been assessed using computational fluid dynamics (CFD) based on the axi-symmetric Navier-Stokes equation. The pressure change inside a train have been calculated using first order difference approximation based on a linear equation between the pressure change ratio inside a train and the pressure difference of inside and outside of the train. The numerical results show that the pressure change inside the new Korean high-seed train passing through a tunnel of Seoul-Busan high-speed line at the speed of 330km/h satisfied well the Korean regulation for pressure change inside a passenger cabin if the train is satisfying the train specification for airtightness required by the regulation.
Study of Tribological Characteristics Between Metallic Friction Materials and Brake Disk
Kim, Sang-Ho ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 72~80
The tribiological characteristics such as friction coefficient, friction stability, wear rate and braking temperature between various types of metallic friction materials and heat resistant steel disk, were investigated by using lab-scale dynamometer. Friction materials for high speed train have higher friction coefficient and friction stability as compared to aircraft friction materials even though friction materials for high speed train have lower wear rate. In addition. Cu-matrix friction materials have higher temperature increase rate than Fe-matrix friction materials. All friction surfaces have Fe-base oxide layer after completing test.
Development of the Design & Coding Standard of Railway Signaling Software as a Automatic Testing Tool
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 81~87
Recent advances in computer technology have brought more dependency on software to railway signalling system. While much efforts have been reported to evaluate embedded software safety for railway signalling systems, not so much systematic approaches to evaluate software safety testing. In this paper, we propose a adaption of automatic software testing tool in terms of the design & coding standard for railway signalling system. The test items for the design & coding standard suggested in this study related international standards and MISRA-C. It is anticipated that it will be greatly helpful for the evaluation on the software for railway signalling system.
A Study on the Life Cycle Cost Calculation of the Railroad Vehicle Based on the Maintenance Information
Kim, Jae-Hoon ; Jun, Hyun-Kyu ; Park, Jun-Seo ; Jeong, Hyun-Yong ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 88~94
Life cycle costing is one of the most effective approaches for the cost analysis of long-life products such as the railroad vehicle. Life cycle costing includes the cost of concept design, development, manufacture, operation, maintenance and disposal. Especially, life cycle costing in the railroad industry has been focused on the maintenance cost. In this paper, the standard, guide and maintenance information of railroad vehicle were investigated, and the unique corrective and preventive maintenance templates of railroad vehicle were proposed. Maintenance cost of an auxiliary power supply system of EMU was predicted by using the proposed templates. The results show that the preventive maintenance, PM, cost is much higher compare to corrective maintenance, CM, cost because of daily and monthly maintenance tasks which require lots of labor work. It is expected that these templates can help railroad operators make maintenance strategies with consideration of the cost parameter.
A Parametric Study on the Serviceability of Concrete Slab Track on Railway Bridges
Park, Hong-Kee ; Jang, Seung-Yup ; Yang, Sin-Chu ; Park, Yong-Gul ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 95~103
Deformations of bridge deck ends on abutments and piers bring about severe problems in track geometry and require maintenance work. In case of concrete slab track, more severe deformation and additional forces on rail and rail supports can be induced by bridge deck deformation, which affect the serviceability of track structure since concrete slab track is much stiffer than ballasted track and the behavior of track structure is integrated with that of bridge deck. In this study, the design variables affecting the serviceability of track structure are selected and the influence level is estimated by a parametric study. As a result, it is found that continuous span is advantageous than simply supported span and the stiffness of bridge bearing and rail fastener as well as the distance between last rail support and bridge bearing are most important parameters.
Research on the Mechanical Strength of Fiber Bragg Grating Sensor Adapting to Railway Structure
Yoon, Hyuk-Jin ; Kim, Jung-Seok ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 104~109
In order to apply FBG(Fiber Bragg Grating) sensor as one of reliable sensors in the commercial railway structure, the reliability of FBG sensor in the mechanical strength viewpoint have to be confirmed and the maximum strain should surpass the fracture strain of the host structure to measure the measurands until the host structures fail. In this paper, several factors that influence the mechanical failure strength of fiber Bragg grating sensors were analyzed. A set-up for dynamic tensile testing of optical glass fibers with fiber Bragg gratings was made. To increase the FBG failure strength, techniques relying on the H2 loading treatment and stripping methods were established and testified as a result of the tensile strength test of optical fibers.
Compressive Strength Restoration Evaluation of Sandwich Composite Laminates Repaired by Scarf Method
Kim, Jung-Seok ; Yoon, Hyuk-Jin ; Kim, Seung-Cheol ; Seo, Sung-Il ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 110~114
This study is for the evaluation of compressive strength restoration of sandwich composite laminates with adhesively bonded scarf patches. It was used in this study that the sandwich composite laminate with an aluminum honeycomb core and CF1263 woven fabric carbon/epoxy faces was applied to the car body structure for Korean tiling train. In this study, it was damaged by low velocity impact and repaired using scarf repair method. Then, the compressive strength restoration of assessed by compressive after impact (CAI) test. From the test, it could be known that the compressive strength was restored up to 72% by only scarf repair method and 91% applied by an extra ply over the undamaged one.
Analysis of Dynamic Responses of Urban Maglev Guideway
Hong, Yu-Na ; Chung, Won-Seok ; Yeo, In-Ho ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 115~121
Maglev guideway is expected to be a new public transportation for future because of its environmental and special characteristics. Recently, Korean government initiated an urban maglev project to build a commercial line in Incheon International Airport by year 2012. For practical use of UTM02, it is essential not only to verify the performances of the vehicle but also to formulate the design rules of Maglev Guideway. In this paper, maglev guideway is analyzed by Finite Element Method and then obtained dynamic characteristics such as displacements, acceleration and impact factor.
A Simulation Study of the Performance of a Propulsion Equipment for Bimodal Tram
Bae, Chang-Han ; Mok, Jai-Kyun ; Chang, Se-Ky ; Lee, Kang-Won ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 122~128
A bimodal low-floor tram is designed to provide the flexibility of bus and the punctuality of trains together to the passengers. The propulsion equipment of the bimodal tram is a series hybrid type using a set of CNG engine generator and Li-polymer battery. The present paper describes the specifications of the propulsion system in the bimodal tram which was drawn by a desirable driving cycle. In addition, it shows how the propulsion system of the bimodal tram can be controlled. With using a computer simulation tool of hybrid vehicles, ADVISOR, the performance of the bimodal tram was verified.
Damage Evaluation of a Railroad Bridge Using Time-domain Deflection Shape
Choi, Sang-Hyun ; Lim, Nam-Hyoung ; Kang, Young-Jong ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 129~134
To ensure the safety and functionality of a railroad bridge, maintaining the integrity of the bridge via continuous structural health monitoring is important. However, most structural integrity monitoring methods proposed to date are based on modal responses which require the extracting process and have limited availability. In this paper, the applicability of the existing damage identification method based on free-vibration reponses to time-domain deflection shapes due to moving train load is investigated. Since the proposed method directly utilizes the time-domain responses of the structure due to the moving vehicles, the extracting process for modal responses can be avoided, and the applicability of structural health evaluation can be enhanced. The feasibility of the presented method is verified via a numerical example of a simple plate girder bridge.
A Method for Schedule Simulation Considering Rework and Uncertainty
Kim, Chan-Mook ; Park, Young-Won ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 135~143
The majority of development projects fail to meet their target schedule and cost, with the overrun typically between 40 and 200 percent. These overruns happen because the planners underestimate the work or do not consider the need to rework at project planning. Representative schedule planning/management techniques such as Gantt Chart, PERT/CPM etc. that are used in domestic project planning are unable to reflect rework. This paper proposes a method to consider rework to provide more realistic estimates at schedule planning. Additionally, to prevent the underestimation of the work this paper proposes a simulation method that calculates a probabilistic estimated schedule and the associated variance based on the random variable modeling of individual task completion dates.
Study on the Development of Quantitative Assessment Computer System to Select Environment Friendly Railway
Kim, Dong-Ki ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 144~150
This study analyzed opinions of specialists checking of industrial environment, analysis of bid guideline to select environment friendly railway corridor and choose weight factors. Thus, 7 major categories were extracted from 20 EIA categories and essential supplement request items for environment friendly railway corridor selection. To select environment friendly railway corridors, many alternatives should be compared and the assessment of each alternative must be carried out on the basis of these 7 categories. To solve this problem, the selected method was AHP which simplifies the complex problems utilizing hierarchy, quantifying qualitative problems through 1:1 comparison, and extracting objective conclusions by maintaining consistency. As a result, a GUI-based program was developed which provides basic values of weighted parameters of each category defined by specialists, and a quantification of detailed assessment guidelines to ensures consistency.
Support Measures for Domestic Rail Freight
Mun, Jin-Su ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 151~160
Recently, the importance of rail in the carriage of freight is strongly emphasized. However, the role of rail in the carriage of freight has been decreasing. The purpose of this study is to suggest policy measures for increasing rail freight. Firstly, this study reviews the current situations of the rail freight in Korea and provides theories for the necessity of government support to rail freight transport. Various support measures are identified and evaluated. According to the evaluation, it is shown that the provision of subsidy for facility construction is the most desirable measure in the sense of cost effectiveness and durability of effect. Finally, detailed implementation strategies for the desirable support measures are suggested.
Evaluation of Rail Leakage Current and Potential in DC Railway
Han, Moon-Seob ; Jung, Ho-Sung ; Kim, Ju-Rak ; Kil, Gyung-Suk ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 161~166
DC feeding system is mainly floating but rail potential and leakage current are due to long parallelism between rails and ground, namely rail resistance and rail to ground conductance. Rail potential causes electric shock to human and rail leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important in recent DC feeding system. Rail potential and leakage current are analysed based on propagation theory that is utilized. Monitoring and controlling rail leakage current is proposed in order to maintain rail resistance and rail to ground conductance.
A Study on Effect of Vibration Reduction with Ballast Mat of Ballasted Track in Tunnel
You, Chung-Jun ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 167~174
Due to the travelling of the train with high speed the period of maintenance activities of the ballasted track is coming to be short, and more from the residential area of the ballasted track tunnel circumference the civil appeal is increasing with railroad vibration problem. To reduce the vibration problem and a maintenance cost establishes the ballast mat in the tunnel within part segment. In this study, to estimate the vibration reduction effect of the ballast mat we have done a comparative analysis with the vibration field test by the transit train by at the ballasted track with ballast mat and the standard ballasted track without vibration protection in tunnel.
A Classification Study on Logistics Equipments and Their Attributes
Chang, Tai-Woo ;
Journal of the Korean Society for Railway, volume 12, issue 1, 2009, Pages 175~182
Needs on ensuring compatibility and conformity of equipments that are used in logistics functions - such as packaging, transporting, loading/unloading and storing - are raised. This article presents a classification scheme for analyzing the interfacing characteristics of logistics equipments focusing on standardized pallets of unit load system. International and domestic classification systems are reviewed and analyzed; as a result several problems are issued. Methods to resolve the problems, to specify the attributes of logistics equipments and to represent the semantics among them using semantic web technology are proposed. This study could make it possible to examine the conformities of interfacing equipments automatically.