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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 9, Issue 6 - Dec 2006
Volume 9, Issue 5 - Oct 2006
Volume 9, Issue 4 - Aug 2006
Volume 9, Issue 3 - Jun 2006
Volume 9, Issue 2 - Apr 2006
Volume 9, Issue 1 - Feb 2006
Selecting the target year
A Numerical Analysis on the Pressure Field Around KTX Train Using the Standard Framework of CFD Analysis for Railway System
Nam, Sung-Won ; Cha, Chang-Hwan ; Kwon, Hyeok-Bin ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 511~516
A standard framework of CFD(Computational Fluid dynamics) analysis for railway system has been developed to evaluate the overall aerodynamic performance of railway system and has been adopted to numerical simulation of the pressure field around KTX train. The framework is composed of standard aerodynamic model and standard aerodynamic performance to customize the general CFD solution process reflecting the characteristics of railway system such as various operation mode and performance factors. The results show that the standard framework of CFD analysis for railway system can provide objectivity and consistency to the CFD analysis for railway system and the pressure field around KTX train has been successively solved.
Life Cycle Assessment on the Interior Panel of Electric Motor Unit (EMU)
Lee, Jae-Young ; Choi, Yo-Han ; Kim, Yong-Ki ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 517~523
The sustainable development is a key issue in the whole field of economy, culture and society, which can be accomplished by the improvement of environment. Recently, life cycle assessment(LCA) has been applied to reduce environmental impacts preliminarily by evaluating the environmental performance of a product through its life cycle. In this study, life cycle assessment was performed to analyze quantitatively the environmental impact on the interior panel of electric motor unit(EMU). As a result, the interior panel with aluminum showed the most global warming(GW), while that with phenol and plastic showed high fresh water aquatic ecotoxicity(FAET) and marine water aquatic ecotoxicity(MAET), respectively. Global warming was occurred mainly due to the emission of
by energy consumption. FAET and MAET were caused by the pollutants released from acid-washing and paints coating process. Therefore, an environmental-friendly EMU can be designed considering the environmental impacts of interior panel.
A Study on the Characteristics of Environmental Impact with the Seat Material of Electric Motor Unit (EMU)
Lee, Jae-Young ; Kim, Bo-Kyong ; Chun, Yoon-Young ; Kim, Yong-Ki ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 524~531
Environmental problem is one of important global issues. Transportations are main pollutant emission sources. Although railroad is stilt an environmental-friendly transportation, its environmental impact has been increased continuously. Especially, because a large amount of environmental impact is released from vehicles and facilities, it is necessary to assess and to reduce their environmental impact. Life cycle assessment (LCA) is a representative method which can evaluate environment impact through the whole life cycle of a product or a process. In this study, the environmental impact of seat in the electric motor unit (EMU) was analyzed quantitatively with its material using lift cycle assessment (LCA). As a result, the characteristics of environmental impact were investigated differently with the material of seat. Among ten impact categories, the seat with aluminum and FRP showed the highest ozone depletion (OD). On the other hand, in the seat with stainless steel and plastic, fresh water aquatic ecotoxicity (FAET) and marine water aquatic ecotoxicity (MAET) were high relatively. Therefore, the parts of EMU must be selected considering the characteristics of environmental impact in future.
A Case Study for the Selection of a Railway Human Reliability Analysis Method
Jung, Won-Dea ; Jang, Seung-Cheol ; Wang, Jong-Bae ; Kim, Jae-Whan ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 532~538
The railway human reliability analysis(R-HRA) plays a role of identifying and assessing human failure events in the framework of the probabilistic risk assessment(PRA) of the railway systems. This study introduces a case study that was performed to select an appropriate R-HRA method. Three HRA methods were considered in the case study: (1) the K-MRA(THERP/ASEP-based) method, (2) the HEART method, (3) the RSSB-HRA method. Two case events were selected based on the review of the railway incidents/accidents, which include (1) a real-end collision event, which occurred on the railway between the Gomo and Kyungsan stations in 2003, (2) the signal passed at danger(SPAD) events, which are caused from a variety of factors. The three HRA methods were applied to both case events, and then the strengths and limitations of each method were derived and compared with each other from the viewpoint of the applicability of a HRA method to the railway industry.
A Study on the Standard and Information System for Urban Transit Maintenance
Ahn, Tae-Ki ; Shin, Jeong-Ryol ; Park, Kee-Jun ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 539~543
We need to make the standards of maintenance information for urban transit to reduce the cost to maintain the information and to share the information with maintenance workers. It is enable to do systematic maintenance for urban transit by using the information system based on the standardized information. In this paper we propose the major items to standardize and the methods to lay out the standard schemes to enable structured maintenance. We present the 4 items, bill of material, material classification, accident/fault classification, electronic document, to standardize. And we propose how to implement the information system for urban transit based on the standardized information. We describe the implemented information system in two parts; a rolling-stock and an infrastructure part. And also we describe the result of survey to evaluate the system installed at Seoul Metro and Seoul Metropolitan Rapid Transit.
Estimation of the Dynamic Behavior for Korean High Speed Train at 350km/h using the Accelerations according to the UIC Code 518OR
Kim, Ki-Whan ; Kim, Young-Guk ; Kim, Seok-Won ; Mok, Jin-Yong ; Park, Chan-Kyoung ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 544~549
The characteristics of dynamic vibration are generally analyzed by an acceleration of a car body of high speed train and the acceleration can be applied to evaluation of running safety. The test of process and the analysis method about it are well explained on UIC Code 518 OR which is the spacial international standard about running safety and dynamic behavior on the line test for railway vehicle. Korean High Speed Train designed to operate at speed 350km/h has been tested on high speed line since it was developed in 2002 and it recorded the highest speed 352.4km/h at the 16th Dec. 2004 in Korea. This paper includes the analysis of running behavior of this train at speed 350km/h and the analysis of dynamic safety is presented in it, extending to the range of high speed while the UIC 518 limit the speed below 200km/h.
A Study on the Effect of Mud-flap on the Cabin Noise in KTX
Choi, Seong-Hun ; Chung, In-Soo ; Seo, Sung-Il ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 550~554
In the early stage of operation of KTX, passengers complained of the excessive cabin noise as the passes the tunnel. The noise is caused partly by wheel-rail contact and partly by airflow around the carbody. In this study, to reduce the cabin noise, the effect of the mud-flaps located between the cars is investigated. A series of tests was conducted to clarify the influences of the type and length of mud-flap, and train speed on the cabin noise. The optimum length of mud-flap was found. The shedding vortices around the mud-flap is thought to be the cause of the aerodynamic noise. Strouhal number and the resonant shedding frequency around the mud-flap correlated well with the cabin noise level.
A Study on the Successful Factors in the Application of RIMS Project for the Safe Operation of Rolling Stocks in the Public Transportation
Lee, Kang-Won ; Bhang, Youn-Keun ; Son, Young-Jin ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 555~560
This study finds out and suggests success factors for the application of RIMS project through the case study of Seoul Metro and literature survey. The successful application of RIMS needs expert knowledge and concept of BOM, standardization of maintenance planning, check lists of heavy maintenance inspection, organization structure of rolling stock maintenance offices, material management system of warehousing and the process of parts repairing between offices, connection of material ordering system, problem solving of circular spare parts administration among inspection, maintenance, and material organizational units, systemic serial number management of parts with RFID, daily closing diary connected with work process chart, and sufficient period of RIMS's test run. RIMS contributes to real time management of rolling stock maintenance, transparency of management, reliability of train operation, customer satisfaction, and management innovation.
Dynamic Response Analysis of Bridge-AGT Vehicle Interaction System
Kim, Hyun-Ho ; Rha, Sang-Ju ; Song, Jae-Pil ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 561~568
Dynamic equations of motion for the interaction system of bridge and vehicle are derived to investigate the dynamic responses of bridge and vehicles induced by moving automated guide-way transit(AGT) vehicle and surface roughness of bridge. The vehicle model for ACT vehicle is idealized as 11 DOF including yawing, lateral translation and steering of wheels, and the bridges are modeled with finite element method. The AGT vehicle model was verified by experimental study. Parametric studies are carried out to investigate the effect of vehicle speed, surface roughness, stiffness and damping of the suspension system, AGT vehicles and dynamic wheel loads of the AGT vehicles. From the parametric study it can be seen that the dynamic incremental factor of the bridge and dynamic responses of vehicles have a tendency to increase with vehicle speeds, surface roughness and the stiffness of AGT vehicle suspension system. On the other hand those dynamic wheel loads have tendencies to decrease in according to increase of damping of the suspension system.
The Effective Utilization of
Degree Feedback System : Focusing on the Case of Railway-related 'A Firm'
Lee, Chang-Ro ; Shin, Tack-Hyun ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 569~576
Recently, many Korean firms have been adopting
Degree Feedback System as a way of adapting to the environmental changes in business world. The reason is that the traditional top-down way of personnel evaluation pattern can not but have many limits in this turbulent changing environment. The main purpose of this article is to depict some aspects of
Degree Feedback System including its current status quo, its positive and negative side, and the effective ways of its improvement focusing on the railway-related "A firm".
Development of Maintenance Information System for Electric Multiple Unit
Park, Kee-Jun ; Kim, Moon-Hyun ; Ahn, Tae-Ki ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 577~581
Urban transit operation corporations perform repetitive work to investigate the EMU, electric multiple unit, by some fixed maintenance cycle. The quality of maintenance work usually depends on workers' know-how. Though some information to support the maintenance work is digitalized and provided to workers, it is not great help to them because of its non systematic structure. The information includes drawings, manuals, work results, work history, fault history, etc. The maintenance workers want to access the information anytime anywhere, and make an effect to promote the efficiency of maintenance for EMU. But it is difficult to achieve that without some structured information system which is able to use in work area. So we develop maintenance information system for EMU for about 4 years from 2002 to 2005. In this paper we present the configuration and characteristics of this system, and the results of the evaluation test. We install the system in two depots, Changdong and Jichuk, belonged to SeoulMetro to evaluate its efficiency and estimate its economic benefits.
A Study on an Improvement of Economical Efficiency for an Overhead Catenary Supporting Thin Walled Steel Pole by the Application of High-strength Steel
Cho, Yong-Hyeon ; Hwang, Min-Oh ; Seok, Chang-Sung ; Lee, Ki-Won ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 582~587
Since Kyung-Bu High Speed Line has been introduced, a railway electrification has been proceeded rapidly. Therefore, in this study, a specification and application standard for an overhead catenary supporting thin walled steel pole using STKT590 material are proposed in order to improve an economical efficiency. To decide the specification, strength analysis, deflection analysis, deflection test and fracture test are performed. If the supporting structures using high strength materials such as STKT590 are installed, the advantages of cost by the materials price reduction and demand and supply are expected.
Dynamic Load calculation at the Bracket of High Speed Train Catenary System
Choi, Yeon-Sun ; Lee, Seung-Il ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 588~593
The catenary system of a high speed train is designed to have a flexibility to ensure the contact with a pantograph during high speed running. The flexibility inevitably entails a vibration. The vibration is transferred to a utility pole through brackets. Therefore, the examination of the dynamic load at the bracket due to the train running is necessary for the design of the bracket. In this research, an equation of motion is derived to calculate the dynamic load at the bracket during high speed running and a computer program is developed. Also, the analyzed results are compared to characterize the dynamic load at the bracket.
Evaluation of the Structural Stability of Platform Screen Door (PSD) due to Train Wind Pressure
Lee, Jae-Youl ; Ryu, Bong-Jo ; Kim, Dong-Hyun ; Lee, Eun-Kyu ; Shin, Kwang-Bok ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 594~600
In this study, transient and quasi-static analysis were done for the evaluation of structural integrity of the platform screen door due to train wind pressure. Fluent 6.0 was used to calculate the train wind pressure, and Ansys 10.0 was used to evaluate the structural stability of platform screen door due to train wind pressure. Transient analysis was used to check the design requirements of platform screen door, and quasi-static analysis was introduced to save the calculating time and check quickly structural performances when compared to those of transient analysis. The results show that structural stability of the platform screen door under train wind pressure is proven and quasi-static analysis can quickly check the structural integrity of platform screen door.
A Study on the Reliability of Software for Railway Signalling Systems
Lee, Jae-Ho ; Park, Young-Soo ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 601~605
Reliability of the Railway signaling system which is safety critical is determined by reliability of hardware and software. Reliability of hardware is easily predicted and demonstrated through lots of different studies and environmental tests, while that of software is estimated by the iterative test outcomes so estimates of reliability will depend on the inputs. Combinations of inputs to and outputs from the software may be mostly combinatoric and therefore all the combinations could not be tested. As a result, it has been more important to calculate reliability by means of a simpler method. This paper identifies the reliability prediction equation applicable to reliability prediction for railway signaling system software, and performs the simulation of onboard equipment of automatic train control for high speed train to review reliability prediction and validity.
Reliability Growth Assessment for the Rolling Stock System of the Korea High-Speed Train
Park, Chan-Kyung ; Seo, Sung-Il ; Lee, Tae-Hyung ; Kim, Ki-Hwan ; Choi, Sung-Hoon ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 606~611
This paper presents a procedure and an analysis method to evaluate reliability of the Korea high-speed train. The rolling stock system is divided into 6 sub-systems and each subsystem is classified into sub-assemblies. Functional analysis has been conducted to draw reliability block diagrams for the sub-systems. First, failure rates has been calculated for each sub-assembly from the failure data obtained during commissioning tests. Then a reliability block diagram is used to evaluate the MKBF(Mean Kilometers Before Failure) of the sub-systems. Activities to increase reliability have been carried out throughout the test runs and analysis results show that the reliability of the rolling stock system is gradually growing in time.
Fault Diagnosis and Performance Evaluation of Auxiliary Block for Korean High-Speed Railway
Kim, Seog-Won ; Kim, Ki-Hwan ; Kim, Sang-Soo ; Koo, Hun-Mo ; Joo, Hyun-Wook ; Han, Young-Jae ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 612~617
As the on-board electric devices determine the performances of vehicles, production of reliable devices is important. To keep the reliability of devices constant, management of performance evaluation of the on-board devices is crucial. Because temperature has a serious effect on failures of the components of the devices, its measurement is the first step for good management. In this study, we described performance characteristics of domestic auxiliary block developed through G7 project. We measured the performances of auxiliary block during test running by the developed on-line measurement system. After we save the input real-time data from each signal of Korean High Speed Train through the network line, we can acquire necessary information through post-processing program. We verify the motor block characteristics of Korean High Speed Train by this system.
A Study on the Characteristics of the Wheel/Roller Contact Geometry
Hur, Hyun-Moo ;
Journal of the Korean Society for Railway, volume 9, issue 5, 2006, Pages 618~623
Understanding the contact between wheel and rail is a starting point in railway vehicle dynamic research area and especially analysis for the contact geometry between wheel and rail is important. On the one hand, the critical speed as the natural characteristics of rolling-stock is generally tested on the roller rig. The geometrical characteristics of the wheel/roller contact on the roller rig are different from these of the general wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. Thus, in this paper we developed the algorithm to analyze the wheel/roller contact geometry of our roller rig which is constructed now and analyzed the difference between whee/roller contact and wheel/rail contact. In conclusion, we found that the yaw motion of wheelset and the roller radius influence the geometrical contact parameters in wheel flange contact area.