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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 10, Issue 6 - Dec 2007
Volume 10, Issue 5 - Oct 2007
Volume 10, Issue 4 - Aug 2007
Volume 10, Issue 3 - Jun 2007
Volume 10, Issue 2 - Apr 2007
Volume 10, Issue 1 - Feb 2007
Selecting the target year
Evaluation of Surface and Sub-surface defects in Railway Wheel Using Induced Current Focused Potential Drops
Lee, Dong-Hyung ; Kwon, Seok-Jin ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 1~6
Railway wheels in service are regularly checked by ultrasonic testing, acoustic emission and eddy current testing method and so on. However, ultrasonic testing is sometimes inadequate for sensitively detecting the cracks in railway wheel which is mainly because of the fact of crack closure. Recently, many researchers have actively fried to improve precision for defect detection of railway wheel. The development of a nondestructive measurement tool for wheel defects and its use for the maintenance of railway wheels would be useful to prevent wheel failure. The induced current focusing potential drop(ICFPD) technique is a new non-destructive tasting technique that can detect defects in railway wheels by applying on electro-magnetic field and potential drops variation. In the present paper, the ICFPD technique is applied to the detection of surface and internal defects for railway wheels. To defect the defects for railway wheels, the sensor for ICFPD is optimized and the tests are carried out with respect to 4 surface defects and 6 internal defects each other. The results show that the surface crack depth of 0.5 mm and internal crack depth of 0.7 mm in wheel tread could be detected by using this method. The ICFPB method is useful to detect the defect that initiated in the tread of railway wheels
An Investigation of Human Error Analysis Techniques in Various Industries with Implications for the Korean Railway Industry
Baek, Dong-Hyun ; Yoon, Wan-Chul ; Kim, Dong-San ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 7~15
Since human errors are being recognized as one of the primary issues in railway safety, there is a definite need for human error analysis techniques that can identify the types of errors and their causes and derive effective countermeasures to help reduce their future probability. But, for some reasons, there are not yet systematic procedures or techniques for analyzing human errors in the Korean railway industry. This paper introduces several techniques that have been developed and utilized for analyzing human errors in Korean and overseas nuclear power aviation railway, offshore oil industry, etc., and summarizes the strengths and weaknesses of each technique. Based on the Investigation of the techniques, the paper also discusses the implications for the development of a human error analysis system for the Korean railway industry.
Safety of Train Passengers in a Tunnel
Kim, Dong-Jin ; Moon, Dae-Seop ; Moon, Seong-Am ; Hwang, Young-Ha ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 16~21
Along with the opening of the high speed railroad in 2004, the number of long tunnels constructed is increasing and will be continued. In this respect, the fro inside the tunnels is a main cause of drastic damages to both facilities and lives of passengers on board, especially more severe consequences are expected if the fire occurs on a train in urban area. Even though, the threat to human lives due to the increasing number of tong tunnels and increasing train operation times inside such tunnels is getting bigger, the studies to measure safety of the tunnel and to enhance the safety of passengers have not been carried out enough in Korea. Therefore, in this paper, we will use the probabilistic method to predict the average number of deaths of passengers in case of fire on a train iii tunnel, and show the potential risk to passengers which can be a guide for safer design of tunnels to be constructed.
The Estimation of Structural-Borne Noise and Vibration of the Bridge under the Passage of the Light Rail Transit
Yeo, In-Ho ; Chung, Won-Seok ; Kim, Sung-Choon ; Kim, Sung-Il ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 22~28
During the passage of the train, the railway bridge undergoes vibration and noise. The noise of railway bridge can be occurred from various sources. The wheel-rail contact, noise from machinery parts, structural-borne noise, pantagraph noise and aerodynamic noise of the train work in combination. Running train is one of the most important factors for railway bridge vibration. The repeated forces with equidistant axles cause the magnification of dynamic responses which relates with maintenance of the track structure and structure-borne noises. The noise problem is one of the most important issues in services of light rail transit system which usually passes through towns. In the present study, The vibration and noise of the LRT bridge will be investigated with utilizing dynamics responses from moving train as input data for noise analysis.
A Case Study on the Cultural Innovation and Change in Performance of the Railway Construction Authority
Ryu, Keun-Ok ; Moon, Dae-Sup ; Kim, Young-Woo ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 29~33
This paper considers the case study of the change management and business innovation of the rail construction agency fer overcoming the crisis it faced in early stage. It will provide the suitable innovation techniques of each change stage. Also, each phase it evaluated the change degree of organization culture especially by the six box model of Weisbord and the Quinn's model. For the Period of Change, organization culture will grow about 10% and harmonize with 4 competitive organization culture; community, innovation, hierarchy, product. Only, it discovered that the difference of the current culture and rho organizer' wish is considerable by the Quinn's model. It wilt be able to describe the innovation fatigue which the organizers feel in the change of organization culture. For the successful innovation, it wilt have to be managed properly and the new innovation technique will have to be developed for solving.
A Railway Safety Proposal with Full System Commissioning
Kim, Young-Woo ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 34~38
Rail network authority have to do the safety ensuring activities including the maintenance of railway facilities, integrated performance verification between the facilities and related lolling stock and safety inspections, etc. When constructing the new lines or upgrading the conventional lines, full system commissioning should be done before the revenue service with railway operator. To develop the optimal full system commissioning model, the status of domestic and foreign railway facilities and railway accidents are analysed and the problems of the safety management are derived. As one of countermeasures for the problems, the procedures and criteria for the full system commissioning are developed.
Durability Evaluation of a Composite Carbody for Korean Tilting Train under Repeated Loadings
Jeong, Jong-Cheol ; Seo, Sung-Il ; Kim, Jung-Seok ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 39~44
This rafer explains a durability test of a large train car body made of carbon/epoxy composite material. The composite car body with the length of 23m was manufactured as a sandwich structure composed of an aluminum honeycomb core and CF1263 woven fabric carbon/epoxy faces. In order to evaluate durability of the composite car body, it was excited by two 500kN capacity hydraulic actuators installed underneath the body bolster. The natural frequency of the composite car body under full weight condition was found to be 4.33Hz. Based on this result, the excitation frequency and displacement of 5Hz and
, respectively, were used as inputs for the durability test. The test was conducted for
cycles. During the test, the nondestructive tests using X-ray radiography and dye penetration method was performed to determine the presence of the cracks. Upon completion of the test, no cracks were found.
A Case Study on Environmental Vibration Prediction : Ground Vibration Effect near from a Tunnel
Kim, Jeung-Tae ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 45~50
When the walls and floor of a tunnel are excited by a train, a ground vibration energy is transmitted to the surface and to footing of a nearby buildings. Excessive vibration affected to a building structure causes undesirable effect to the structural safety and the perception on residents in building. In this paper, a simple approach is introduced to predict how much vibration, in terms of level and spectra, is transmitted through the ground from the tunnel vibration excitation. A high rise building on a tunnel is selected as an application example of this case study.
A Study of Control Algorithm for Propulsion System
Choi, Jae-Ho ; Kim, Hyung-Chul ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 51~56
In this paper, control schemes are developed for a propulsion system(Converter/Inverter) in electrical train. A robust controller for PWM converter is proposed. The converter controller consists of a PI controller for DC output voltage and a current controller using error-space approach for maintaining the sinusoidal current waveform and unity power factor. This proposed method is based on characteristic ratio assignment(CRA) method which has the advantage to design the optimal gain to meet the referenced response and overshoot within the limit range. Inverter system is controlled by vector control and slip frequency control. At low speed region, vector control scheme is applied to control instantaneous torque and slip frequency control is performed under overmodulation region and one pulse mode. Because output voltage of converter contains harmonics ripple at twice input ac line frequency, control scheme is developed to reduce the pulsating torque current. The performance of propulsion system will be verified by simulation and prototype experimental results.
A Study of Successful Factor on PSD Application Technique for Manual Operation Mode(ATS)
Son, Yeong-Jin ; Park, Keun-Soo ; Min, Kyung-Yun ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 57~66
1974. 8. 15 SeoulMetro, beginning with the first electric railway established at six cities, so it is managing mass transportation of traffic. Especially, in case of seoul, It is managing that from one to eight lines, 286.9km, 265 stations have installed and now it is carrying about 5.5million of passengers everyday, and 2,000million passengers a year. So accident is increasing from the station every year. For this measure, SeoulMetro prepares safety fence for passengers crash but, as suicides or people who watch the accident took place, for at the bottom of passengers crash protection, PSD installing is needed. Even though, PSD is managing ATO section but, in controlling SeoulMetro, one to four lines sections are (ATS, ATC)section. Between as ATS, ATC section, ATO section, subway gate and PSD must have opened and crossed always at the time. And the interlock control corrosion protection gate, managing skills with installation, method, using in history, apply to 10rail cars one train sets, and maximum applying 2224% sections of passengers congested that consideration is to be needed. So 2004, SeoulMetro improved technology and basie design of PSD at ATS section. Based on this, from 2005.4 to 2006.6, using subway 2lines per 12stations set the model installation(full type 11stations, half type 1station) After installing in case of success, it is going about to suggest that effective analysis and hereafter subject.
Experiments of Smoke Behavior in an Underground Subway Station
Kim, Dong-Hyeon ; Jang, Yong-Jun ; Park, Won-Hee ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 67~73
Experiments were carried out to investigate smoke movement in platform of a subway station which currently is in service in Pusan, the second largest city in Korea. The recently constructed underground station of the "bank type" (two platforms on both sides of track) which is the popular layout of platforms in Korea, is chosen in Pusan. The smoke generator and heater are used for simulating the smoke movement at the fire break in the platform located in the 2nd basement of the station. Video recordings were used to monitor smoke lowering. In this study, the movements of smoke in the underground station are investigated under various smoke-control operating modes. Three tests wire conducted according to its operating mode of the ventilation systems in the platform: no operation of any ventilation systems, smoke extraction mode in occurrence of fire (presently running mode) and full capacity of smoke extraction where all vents are activated in the platform. The results can be used for comparing with the numerical prediction results of fire subway stations.
Competition Structure and Management Capability of Railroad Companies in Tokyo, Japan
Lim, Chai-Sung ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 74~83
Japanese railroad companies continued growing by developing diversification based on the railroad enterprise. However, the diversification strategy of railroad companies reached the management limit in the 1990s. Under the long-term economic depression, Aging and a decrease in the birthrate progressed and passenger transport changed to the downward tendency. Nevertheless, since railroad investment was expanded, business results worsen and price competitiveness with JR East became weak. Futhermore, the business results of a diversification enterprise were bad compared with it of a railroad enterprise. Therefore, group management was thought as important and structural reform was carried out resolutely.
A characteristic test of Auxiliary power supply for High Speed Rolling stock 350 experimental (HSR-350x)
Kim, Dong-Hwan ; Lee, Byung-Song ; Lee, Tae-Hyung ; Jeong, Sang-Hun ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 84~87
Auxiliary power supply developed by domestic technology has very important function that not only effect on main power converter & inverter system, traction motor and train control system which are related to performance of train, but also influence on power supply for HVAC(Heat, Ventilation, Air-conditioning) and lighting device which are related to comfort of passengers. This paper shows characteristic test results of auxiliary power supply such as working condition and performance, which is associated with velocity of train, operating mode and surrounding equipment, through test running. And, it propose a modification of design parameter for stabilizing operation and improving reliability.
Mastership Passing Algorithm for Train Communication Network Protocol
Seo, Min-Ho ; Park, Jae-Hyun ; Choi, Young-Joon ;
Journal of the Korean Society for Railway, volume 10, issue 1, 2007, Pages 88~95
TCN(Train Communication Network) adopts the master/slave protocol to implement real-time communication. In this network, a fault on the master node, cased by either hardware or software failure, makes the entire communication impossible over TCN. To reduce fault detection and recovery time, this paper propose the contention based mastership transfer algorithm. Slave nodes detect the fault of master node and search next master node using the proposed algorithm. This paper also shows the implementation results of a SoC-based Fault-Tolerant MVB Controller(FT-MVBC) which includes the fault-detect-logic as well as the MVB network logic to verify this algorithm.