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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 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
Evaluation of Dynamic Fatigue Life for Maglev Bogie Frame
Han, Sung-Wook ; Woo, Kwan-Je ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 1~8
In domestic developing magnetically levitated (Maglev) vehicle, bogie frames install electromagnets which provide the vehicles to run with levitation and guidance forces; moreover, the linear motors used for traction are integrated into the same mechanical structure. This paper presents the process which predicts the evaluation of life cycle for bogie frame on various running conditions. Durability analysis considering vibration effect is simulated by using random loads resulted from dynamic simulation which takes into account the irregularities of guide rail. And it supports additional weak points which were not examined in static analysis.
A Study on the Verification of Heavy Overhaul Maintenance Allowances for the Maintenance Shop
Choi, Sung-Hwan ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 9~15
When designing the size of a heavy maintenance shop for rolling stock, it is required to arrange buildings and facilities in the minimum site so as to improve the maintenance efficiency. However, the fluctuation rate (hereinafter "allowance rate") on which factors such as service and maintenance fluctuation should be applied when estimating the size of the maintenance shop has been used without verification. The objective of the study is to calculate a reasonable allowance rate and to review its appropriateness through the analysis of the facilities layout and process simulation to absorb the above elements into the staying time in the heavy maintenance shop. Since the working time, in this study, is assumed to be average working time, 10~20% was given to the standard deviation of working time in consideration of difference between workers, and possible allowance rate was drawn by analysis of the simulation results. In the future, it is required to optimize the size of the shop by applying appropriate allowance rate through scientific review of such factors as O&M plan, R/S reserve rate, capability of the shop, outsourcing rate, standard work amount, and so on.
Development of a Dynamic Simulation Program Including a Wheel-Rail Contact Module
Cho, Jae-Ik ; Park, Tae-Won ; Yoon, Ji-Won ; Lee, Soo-Ho ; Jung, Sung-Pil ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 16~22
Various programs for dynamic simulation of the railway vehicle have advantages and disadvantages. These programs have limitation that cannot express a large deformable body for an wire of the railway vehicle. In this study, a program for dynamic simulation of the railway vehicle is developed. And the rigid, flexible and large deformable body can be simulated using this program. Its reliability is verified by comparison with a commercial program. Also, a wire is considered as the large deformable body and a sliding joint which connects the rigid body to the large deformable body is included. Moreover, as the wheel-rail contact module is added, the dynamic simulation of the railway vehicle can be analyzed using the developed program.
Development of Telepresence System for Schedule Management in Railway Construction Project
Kang, Leen-Seok ; Kim, Hyeon-Seung ; Park, Jin-Jung ; Moon, Hyoun-Seok ; Shin, Min-Ho ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 23~30
In the construction phase, the existing schedule management system by 4D CAD has been difficult to check for a status and progress of construction product in real-time because it simulates only VR (virtual reality) object based on a planned schedule. This study suggests a construction schedule management system by telepresence technique that can visualize progress status in real-time by using 4D CAD system based on remote monitoring. The telepresence methodology and system were developed in the study and they were verified for a railway construction project. The developed system can examine the status and progress of construction because it can compare 4D simulation based on planned schedule with real-time site images through web-camera.
Investigation of Cell Size Effects of Honeycomb Sandwich Composite Square Tubes Under Compressive Loadings
Kim, Jung-Seok ; Yoon, Hyuk-Jin ; Kwon, Tae-Soo ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 31~36
The objective of this study is to evaluate effects of honeycomb cell size for compressive behaviors of square sandwich composite tubes with woven fabric carbon/epoxy skin and Al honeycomb core. In order to achieve these goals, four different kinds of tubes were fabricated and compressed to 200mm~250mm under quasi-static load of 10mm/min. The Al honeycombs with cell size of 6.35mm and 9.53mm were used. The relationship of mean compressive load and cell size was evaluated. In addition, the effect of peel strength and equivalent elastic modulus in ribbon direction for the mean compressive load was investigated.
Development of Catenary Arc Detection System
Song, Sung-Gun ; Lee, Teak-Hee ; Cho, Seong-Jae ; Moon, Chul-Yi ; Park, Seong-Mo ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 37~43
Catenary (Overhead Contact Lines) and Pantograph are used to transmit electrical energy to electric railways. An Arc occurs by unstable contact between catenary and pantograph during electric railways operation, which causes malfunctioning or even an accident. Therefore, to prevent a arc or electric contact loss are required arc detection systems with catenary maintenance capability. This paper describes developing of catenary arc detection system using photo detector in order to detect arc incidence in a indirect way. This developed system can also achieve Video-recordings and environmental conditions such as wire voltage/current, pantograph height, speed, position of electric railways, and temperature/humidity. This system have been evaluated at the section that bounds for dongdaegu from seoul. From the experimental results, the occurrence of arc and intensity of arc are mainly effected by wire voltage/current, pantograph height and speed of electric railways.
Parametric Study on the Aerodynamic Drag of Ultra High-speed Train in Evacuated Tube - Part 1
Kwon, Hyeok-Bin ; Kang, Bu-Byoung ; Kim, Byeong-Yun ; Lee, Du-Hwan ; Jung, Hyun-Ju ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 44~50
This study is devoted to understand the basic characteristics of the flowfield around a train in evacuated tube and to suggest an efficient numerical method to calculate the flowfield. To get steady-state solution in minimum calculation domain, various boundary condition have been tried for steady calculation and have been compared to the solution of unsteady calculation. At the train velocity of 300km/h, the aerodynamic drag results of both calculation method agreed very well. The drag ratio between on the open filed and in the tube from the calculation result by the suggested numerical method lied in the same fitting curve with that from the filed test of high-speed trains running in the line.
Parametric Study on the Aerodynamic Drag of Ultra High-speed Train in Evacuated Tube - Part 2
Kwon, Hyeok-Bin ; Nam, Seong-Won ; Kim, Dong-Hyeon ; Jang, Yong-Jun ; Kang, Bu-Byoung ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 51~57
The aerodynamic drag of ultra high-speed train in evacuated tube have been calculated using computational fluid dynamics and the variation of aerodynamic drag for the change of major system parameter of tube-vehicle system such as the train speed, air density, and the tunnel diameter. The aerodynamic drag in the tube increases with increasing train speed, however, the ratio of drag increase in tube is larger than that on the open field, the V square rule. The aerodynamic drag decreases with increasing tunnel diameter and increasing air density, and the drag increasing for air density is almost linear just like that on open field. For some combination of the parameters, the trend of aerodynamic drag of train showed irregularity.
A Study for Reliability Improvement of Belt Type Door System using FMECA
An, Cheon-Heon ; Lee, Do-Sun ; Son, Young-Jin ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 58~64
As a modem urban train is getting complex in terms of high-technology in its systems and components, the failure management should be performed with scientific and systematic technique. FMEA is a technique to analyze the failure trends of component parts and influences to the higher level system in order to discover the design incompleteness and potential defects, which is for improving reliability. Especially, FMECA (Failure Mode Effects, and Criticality Analysis) is used in case that the criticality that has an immense influence to the system is important. In case of urban train, in its design and manufacturing steps, FMEA is frequently used as an analysis technique to meet the safety objectives and eliminate potential hazards/failures since the concepts of reliability of train is introduced these days. Though, FMEA technique in the maintenances steps lacks in its investigation and applications yet. FMEA is also not applied to the trains operated by Seoul metro in the design and manufacture steps excepts the newest trains. In this paper, through analyzing the failures/maintenance data of the belt-type door systems used in trains operated in Seoul metro Line 1, which is accumulated in RIMS (Rolling-stock Information Maintenance System), FMEA procedures to the belt-type door engines are proposed. Especially, an effort is made, to approach the detailed FMECA procedures to the door magnet valve and switch and door engine devices which vastly influences the customer safety and satisfaction.
Investigation of Autotransformer Configuration to Enhance Collecting Voltage in Train
Kim, Joo-Rak ; Kim, Jung-Hoon ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 65~70
AC traction power supply system has adopted autotransformer (AT) feeding method. This system has an advantage as long feeding distance. However, the countermeasure for voltage drop should be considered, because load capacity grows larger and headway grows shorter in recent electric railway system. This paper proposes the improved system configuration to enhance voltage drop in ac railway system without additional power electronic device. That is to increase turn ratio between contact wire and rail of AT. By modifying turn ratio of AT at SSP or SP, collecting voltage on train will be enhanced.
A Condition Rating Method of Bridges using an Artificial Neural Network Model
Oh, Soon-Taek ; Lee, Dong-Jun ; Lee, Jae-Ho ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 71~77
It is increasing annually that the cost for bridge Maintenance Repair & Rehabilitation (MR&R) in developed countries. Based on Intelligent Technology, Bridge Management System (BMS) is developed for optimization of Life Cycle Cost (LCC) and reliability to predict long-term bridge deteriorations. However, such data are very limited amongst all the known bridge agencies, making it difficult to reliably predict future structural performances. To alleviate this problem, an Artificial Neural Network (ANN) based Backward Prediction Model (BPM) for generating missing historical condition ratings has been developed. Its reliability has been verified using existing condition ratings from the Maryland Department of Transportation, USA. The function of the BPM is to establish the correlations between the known condition ratings and such non-bridge factors as climate and traffic volumes, which can then be used to obtain the bridge condition ratings of the missing years. Since the non-bridge factors used in the BPM can influence the variation of the bridge condition ratings, well-selected non-bridge factors are critical for the BPM to function effectively based on the minimized discrepancy rate between the BPM prediction result and existing data (deck; 6.68%, superstructure; 6.61%, substructure; 7.52%). This research is on the generation of usable historical data using Artificial Intelligence techniques to reliably predict future bridge deterioration. The outcomes (Long-term Bridge deterioration Prediction) will help bridge authorities to effectively plan maintenance strategies for obtaining the maximum benefit with limited funds.
Improvement of Dry-blasting Efficiency for Ballast used as Aggregate of Paved Track
Lee, Il-Wha ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 78~83
On the paved track, the ballast is used as aggregate for the filling layer using the pre-packed concrete technique. The most important condition of aggregate is adhesive strength with mortar. To satisfy this condition, surface of aggregate should be cleaned by water or others. In a paved-track method to be introduced domestically, an environment-friendly dry-washing technology which will replace the water-washing method has been developed. A dry-washing method was designed to blast the crushed weight material with a diameter of 0.3~0.5mm at high pressure to peel the surface of the aggregate. The study was intended to enhance the washing efficiency of dry-blasting technology and to that end, the tests including blasting material, content of fine aggregate depending on time elapsed, content of chloride, LA abrasion rate and compressive strength were conducted to recommend the efficient washing material and the process.
Building of Large Triaxial Testing Apparatus and Static Triaxial Testing for Railway Ballast
Lee, Sung-Jin ; Kim, Yun-Ki ; Lee, Il-Wha ; Lee, Jun-S. ; Park, Jae-Jun ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 84~91
We built multi-purpose large triaxial testing system that can test and evaluate various geotechnical design parameters such as shear strength, deformation modulus and stress-strain behaviour for large diameter granular materials, which are the most commonly used construction materials in the railway, road embankments. The details of the built testing system and the results obtained from static triaxial test carried out for gneiss ballast material are discussed within the scope of this paper. Ballast is hardly saturated and is confined at low overburden pressure, since the depth is shallow and the permeability is very high. Herein we ascertained that the confining pressure can effectively be controlled by vacuum. The rational trend could be checked up through triaxial test results such as shear strength, deformation, and particle breakage. And the shear strength envelope could be non-linearly represented with the parent rock strength, confining pressure of the triaxial test and proper parameters.
A Study on the Driving Regulation of the Urban Railway Vehicles with Block Systems
Jeon, Y.S. ; Lee, H.S. ; Kim, C.S. ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 92~98
Block system has been used to protect trains from occupying the same section of track at the same time so that only one train is permitted in each block at a time. Domestic driving regulations on the block system is divided into two classifications, such as regular block and substitute block. If it is impossible to use this regulation, the block applied method can be applied. However, domestic urban railway administrator has established his own operation rule within the regulation. Therefore, in order to assure continuous safety of train in operation, it is necessary to strengthen the regulation as can cope with the various block systems. In this study, domestic urban railway administration's own rules are examined and the appropriate driving regulation on the block system is proposed.
A Study on the Design Trend of Train Nose
Lee, Hee-Yup ; Hong, Suk-Ki ; Kim, Chang-Hyun ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 99~107
The design trend of train nose has been developed through interrelation of social culture and trains. Along with the changes of social culture and train nose of the advanced railway countries (United Kingdom, Germany, France, Japan, Korea) have been divided into the 6 periods from the 1800's to 2008. First, the design changes on the Image scale, Munsell system, Design positioning map of train nose have been confirmed. Second, the design trend of train nose through social culture has been analyzed. Last, the research on the design trend on train nose of each country has been done. The result shows that the design trend of train nose is a progressively structural, practical, popular, humane, eco-friendly and state-of-the-art design trend.
A Study on the Changing Factors in Rail Policy in the UK
Lee, Yong-Sang ; Chung, Byung-Hyun ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 108~118
This paper analyzes the changes in rail policy in the UK between 1948 and 2007. The UK rail system, once a nationalized industry, was privatized in 1994. Consequently it increased the role of government after 2000, which was a year of frequent rail accident. Recently the UK rail system has made solving global warming and EU interoperability in rail. This paper examines the main factors in changes in rail policy in the UK, which is through the ruling party's ideology, comprehensive transport policy, aimed at reducing global warming and rail accident. Moreover, this paper clarifies the characteristics of rail policy that is consistent with social role of rail, integrative transport policy and acknowledging the positive role of rail against global warming.
The Feasibility Study of a Light Rail Transit Development
Nam, Doo-Hee ; Lim, Kwan-Su ; Lee, Jin-Sun ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 119~124
Light rail is an electric railway system, characterized by its ability to operate single or multiple car consists (trains) along exclusive rights-of-way at ground level, on aerial structures, in subways or in streets, able to board and discharge passengers at station platforms or at street, track, or car-floor level and normally powered by overhead electrical wires. Depending upon the specific system, the light rail lends some major advantages to urban settings. The evaluation of light rail technology as a potential component of regional transit systems has been the subject of extensive studies throughout the country in the past decade. For the study, feasibility was defined as "the ability of an LRT system to achieve certain level of transportation market in comparison with other transportation alternatives." This paper describes the feasibility study to evaluate a proposed light rail development project. The minimum are those LRT systems that would met to make a project feasible for further evaluation.
Study of Improving the Operation Diagram of Seoul Metro Line 9 by Diversifying Train Patterns
Han, Suk-In ; Lee, Dong-Keun ;
Journal of the Korean Society for Railway, volume 13, issue 1, 2010, Pages 125~130
The government makes an effort to disperse the centralization of Seoul through the its surroundings development for relieving the various social problems caused by the capital region concentration. But, the planless rail system development in the capital region have made it difficult to approach into Seoul city center from its surroundings. Through Seoul metro line 9, constructed by private company first in Korea, that has operation plan with normal and express train together, we would like to study up on promotion of passenger service quality such as "the improvement of the accessibility to Seoul city center from its surroundings" and "service of various pattern of trains".