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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
A Study on the Noise Characteristics of Subway Train
Choi, Yong-Woon ; Koo, Jeong-Seo ; You, Won-Hee ; Koh, Hyo-In ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 329~334
Subway is used as a useful transportation method to solve the metropolitan traffic problem for its advantages of being not only accurate, safe and massive, but also of not producing any exhaustion gas in compare with the other ground transportation systems. However, noise inside the car due to concrete based rail track and tunnel structure has become a social problem. So, an analysis on the noise characteristics according to their routes and locations was made on the basis of the actually measured results from the trial run. To reduce the interior noise of subway train, the side part of rolling stock should have a noise blocking system fur low band frequency noise, the floor of it should have that for medium range frequency noise and the side part as well as lower part of it should have good noise reduction and absorption function.
Harmonic Iron Loss Analysis of Permanent Magnet Motor for High-Speed Train
Seo, Jang-Ho ; Chung, Tae-Kyung ; Jung, Sang-Yong ; Lee, Cheol-Gyun ; Jung, Hyun-Kyo ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 335~341
To predict efficiency of interior permanent magnet synchronous motor (IPMSM) for traction motor and to cope with the risk of demagnetization in the permanent magnets, accurate iron loss analysis and understanding of the characteristic of the iron loss are very important at motor design stage. In this paper, we present the method to estimate the iron loss for the IPMSM considering the driving conditions such as both field weakening control and maximum torque per ampere control.
Expert System for FMECA Using Minimal Cut Set and Fuzzy Theory
Kim, Dong-Jin ; Kim, Jin-O ; Kim, Hyung-Chul ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 342~347
Failure Mode Effects and Criticality Analysis (FMECA) is one of most widely used methods in modern engineering system to investigate potential failure modes and its severity upon the system. While performing FMECA, the experts evaluates criticality and severity of each failure mode and visualize the risk level matrix putting those indices to column and row variable respectably. Which results uncertainty in the result. In order to handle the uncertainty and conclude risk level matrix, this paper proposes a new FMECA procedure using minimal cut set (MCS) and fuzzy theory. Severity is calculated by proposed structural importance while criticality is determined by typical equipment failure rate data from IEEE Std 493. Finally, the risk level is compounded of these indices.
Estimation of the DMT Utility Function Using SP Survey
Lee, Kang-Won ; Kook, Kwang-Ho ; Jang, Sung-Young ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 348~356
The objective of this paper is to estimate the DMT utility function for the transportation mode choice using SP survey. With the freight OD data the estimated utility function can be used as a basic data for forecasting DMT market. 3 alternatives of transportation mode are considered in SP survey; railway, road and DMT. The utility functions are developed according to the freight items, which are container, steel and chemical product. In this study the attribute variable are chosen as time, cost and reliability. The number of level for attribute variables are 3. The high valve is determined as +10% above the standard and the low value -20% below the standard.
Study on the Improvement of Empirical Formula for Prediction of Ground Vibration Induced by Urban Rapid Transit
Shin, Han-Chul ; Cho, Sun-Kyu ; Yang, Shin-Chu ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 357~363
In this paper, field measurements in the subway tunnel and adjacent building were performed to predict the pound vibration level induced by urban rapid transit (subway) in Seoul, Korea. From the results of the measurements, the measured ground vibration level induced by subway in Seoul is smaller than the empirical formula of New York, but it is bigger than the empirical formula of Tokyo which has been commonly used in Korea. We suggested the empirical formula for prediction of ground vibration level induced by subway in Seoul considering on the wave propagation path for soils or rocks, respectively.
A Study on the Elimination Method of Noise Image Caused by Rainfall Using Machine Vision
Lee, Seong-Gwon ; Lee, Dae-Won ; Kim, Gil-Dong ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 364~369
Pantograph sliding plate abrasion auto-detect system, one of the electric rail car auto-detecting devices, is a system that decides how much abrasion and when to replace without an inspector physically looking at the abrasion on the wet plate using machine vision, a cutting-edge technology. This paper covers the cause of deteriorating reliability that affects pantograph wet plate edge detection doe to noise added to the video when it rains. In order to remove such noise, problems should be checked through Smoothing, Averaging mask and Median filter using filtering technique and stable edge detection without being affected by noise should be induced in video measurement used in machine vision technology.
A Study on the Planning of Railway Route Adjacent to the Preservation Area of Cultural Assets
Roh, Byoung-Kuk ; Kim, Jae-Bok ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 370~375
This study draws from the hands-on experience of designing railway routes that pass very close to the Cultural Heritage Protection Areas. There have been many cases where the rail route plan is rejected during the deliberation process of National Cultural Heritage Alteration although it has been selected as the best alternative after much time and expenses are spent and public consensus is obtained. When the route has to be realigned, this often leads to project delay and possible counter protest from the local public. In an effort to prevent such problems from occurring over again, this study looks at the projects where railways pass close to the Cultural Heritage Protection Areas. We examine the nature of public protests and the route selection process that reflects these protests into consideration. Based on the experiences drawn from these cases, we offer a few suggestions that we hope will contribute to the success of the project. The suggestions include the right timing for the application of Cultural Heritage Alteration and route alignment technique.
On the Peer-Review Process Model for an Effective Technical Review
Choi, Yo-Chul ; Lee, Jae-Chon ; Cho, Yeon-Ok ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 376~381
While applying the systems engineering (SE) in systems development, a series of technical reviews play a critical role and is intended to monitor the status of the progress and outcomes of the project for which appropriate technical plans prepared earlier should be executed. It is noted however that during the technical review executed as planned, a lot of problems usually come out. Included are the ambiguity in the reports of the progress status and outcomes, discrepancies among the opinions from different participants, and the delay in carrying out the tasks. To solve those problems in an early stage, informal reviews are usually adopted before the formal technical reviews are held. A type of the informal reviews is the peer review. This paper is concerned with the peer review process model to make the later technical reviews more effective. Specifically, we first review the necessity and meaning of the peer reviews. We then study a model for the peer review process. To model the process, the methods of an IDEF modeling and schema definition have been applied using a computer-aided SE tool, Cradle(R), in the environment of the national research and development project. As a result, the implemented process model can show hew the peer review process is designed and managed to be utilized in the technical review. The documents related with the peer review process can also be generated automatically from the developed model Database. Finally, a general misunderstanding about the peer review and its improvement plan have also been mentioned.
Develop the Product Verification Process for the National R&D Project
Choi, Yo-Chul ; Lee, Jae-Chon ; Cho, Yeon-Ok ; Kim, Sang-Ahm ; Yoon, Hyuk-Jin ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 382~387
When a system or service is realized, it needs to be verified by requirements. The process of verification is to check whether customers/stakeholders requirements have been property transformed into a system or service. A set of verification processes is described in the international or industrial standards. However, it is not appropriate to directly apply those verification processes in the national research and development projects. In particular, we noticed the problem in the development of safety systems, standards and process in the railway systems domain. As such, this paper is concerned with a detailed development of the verification process in that domain. Specifically, an effective and efficient verification process is presented regarding the safety systems and process, safety standards, and safety documents. Also, the verification process was modeled by a computer-aided systems engineering tool, Cradle(R). As a result, the outcomes of the verification process on be managed efficiently.
Flexural Behaviors of Reinforced Concrete Beams Strengthened with Glass Fiber Sheets
Kim, Seong-Do ; Cho, Baik-Soon ; Seong, Jin-Wook ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 388~395
To investigate the flexural behavior of RC beams strengthened with glass fiber sheets, 1 control beam and 8 strengthened beams (4 NU-beams without U-shaped band and 4 U-beams with U-shaped band) are tested. The variables of experiment are composed of the number of glass fiber sheets and the existence of U-shaped band, etc. The maximum load was increased by 48% and 34%, and the flexural rigidity by 920% and 880% for NU-beam and U-beam, respectively, compared with those of the control beam. The ductility ratios were 1.43
2.60 for NU-beam and U-beam. The experimental results showed that the strengthening system with U-shaped band controls the premature debonding and provides a more ductile failure mode than the strengthening system without U-shaped band. It can be found from the load-deflection curves that as the number of fiber sheets is increased, the maximum strength and the flexural rigidity is increased. The experimental results are compared with the analytical results of nonlinear flexural behaviors for strengthened RC beam. The experimental and analytical results were well agreed.
The Parametric Study Effecting on the Fatigue Life of Rail on High Speed Railway
Park, Yong-Gul ; Kang, Yoon-Suk ; Go, Dong-Chun ; Sung, Deok-Yong ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 396~404
With developing the next generation high speed railway, there need to be plans to make sure of running safety though researchs on the crack and break of rail by rolling contact fatigue. Therefore, this study performed the parametric analysis effecting on the fatigue life of rail using simplified equations. It analyzed the internal stress of rail according to the track quality, train velocity, wheel radius, track stiffness, sleeper space, wheel load. For the more, via the finite element method, it analyzed shear force on the rail head which could be changed by the early length of crack, angle of crack and temperature. As a result, this study continued the main parameter effecting on the fatigue life of rail.
A Study on Coupling Coefficient Between Rail and Reinforcing Bars in Concrete Slab Track
Kim, Min-Seok ; Lee, Sang-Hyeok ; Lee, Jong-Woo ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 405~411
Railway signaling system in a rapid transit using the ATC system the approved a speed limit to a train and a part of signaling system in a metro approved a distance which is possible to move. Referring to the way of transmitting train control information, there are the one transmitting it to the on-board system of a train using the direct track, the another transmitting it establishing an instrument, and the other transmitting an instrument by a railway track. The one is the method using the direct track as a conductor for composing the part of the track and attaining the information controlling a train by transmitting a signal to the track. It is used for the high-speed railway and the subway. The method using the track attains information by transmitting it to returned information, and the on-board system of a train attains it by magnetic coupling. Because many reinforcing bars on the concrete slab track are used, interaction between a rail and a reinforcing bar that is not produced on ballast track is made. Due to the interaction, the electric characteristic of rail is changed. In the current paper, we numerically computed the coupling coefficient between the rail and the reinforcing bar based on the concrete slab track throughout the model related to the rail and the reinforcing bar using the concrete slab track that is used in the second interval of the Gyeongbu high-speed railway, and we defined the coupling coefficient not changed in the electric characteristic of rail in the condition that there is no interaction between the rail and the reinforcing bar.
A Guided Wave-Based Structural Damage Detection Method for Structural Health Monitoring
Go, Han-Suk ; Lee, U-Sik ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 412~419
How to efficiently and accurately detect the damages generated in a structure has become an important issue for structural health monitoring (SHM). Most existing SHM techniques require the baseline data which should be measured before a structure get damaged. Thus, this paper presents a new pitch-catch method-based SHM technique which will not require the baseline data any more. In the proposed SHM technique, the imaging method is also utilized to visualize damage locations. The proposed SHM technique is then validated through the damage detection texts for damaged aluminum plates.
Quantifying Rail Travel Demand Changes using Observed Transport Data
Eom, Jin-Ki ; Heo, Tae-Young ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 420~426
Although the amount of travel demand is a critical factor in a benefit-cost (B/C) analysis of railway investment, the travel demand changes especially for induced demand have not been considered. Therefore, the basic study of how to estimate travel demand changes after railway investment is worth investigating. This study reviews the methodologies for estimating diverted and induced demand generated after railway investment, and proposes appropriate approaches that will help railway planners to practically apply them in a case study. Further, the research stimulates the needs of consideration of the travel demand changes in the feasibility studies of railway planning.
High-speed Rail Infrastructure Priority Decision Making on Level of Design Speed by Rail Network Design Problem
Park, Jin-Kyung ; Lim, Yong-Taek ; Lee, Jun ; Eom, Jin-Ki ; Moon, Dae-Seop ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 427~436
This paper introduced Railway Network Design Problem (RNDP) to provide priority decisions on high-speed railway investment scenarios defined by various network segments and train systems. The RNDP optimizes the objective functions of minimize total travel time. Results show that the priority of high-speed railway investment is found to be East-west, West-coast, and South-coast line respectively. An entirely new line built with 400km/h is found to be the best alternative to East-west line. Regarding West-coast and South-coast line, the combined alternative of upgrading Geolla and Kyeonjon line with 200km/h and building a new line with 400km/h and 350km/h for remains of each line is the best.
Dynamic Characteristics Analysis Considering the Effect of the Vortexes of Flux in a LIM for Railway Propulsion System
Park, Chan-Bae ; Lee, Byung-Song ; Lee, Ju ;
Journal of the Korean society for railway, volume 12, issue 3, 2009, Pages 437~442
In the case of a Linear Induction Motor (LIM), numerical analysis method like Finite Element Method (FEM) has been mainly used to analyze the travelling magnetic field problem which includes the velocity-induced electromotive force. If the problem including the velocity-induced electromotive force is analyzed by FEM using the Galerkin method, the solution can be oscillated according to the Peclet Number, which is determined by conductivity, permeability, moving velocity and size of mesh. Consequently, the accuracy of the solution can be low and the vortexes of flux can be occurred at the secondary back-iron. These vortexes of the flux occurred at the secondary back-iron does not exist physically, but it can be occurred in the analysis. In this case, the vortexes of the flux can be generally removed by using Up-Wind method which is impossible to apply a conventional S/W tool (Maxwell 2D). Therefore, in this paper, authors examined the vortexes of the flux occurred at the secondary back-iron of the LIM according to variations of the Peclet Number, and analyzed whether these vortexes of the flux affect on the dynamic force characteristics of the LIM or not.