• Title/Summary/Keyword: Fault Train

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Study for Optimized Depot System of Train Monitoring System (철도차량 모니터 장치의 지상장치 최적화 기법에 관한 연구)

  • 주해진;한정수;박성호;홍구선
    • Proceedings of the KSR Conference
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    • 2002.10a
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    • pp.497-502
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    • 2002
  • TGIS(Train General Information System) is monitoring Train status and analyzing fault happened. TGIS informed a lot of Passenger data, Driving data, Status data and Fault data to 'Depot'. For dealing them more properly, TGIS need specified data and specialized data handling method. This paper suggest Optimize data of Train Monitoring System and Apply that to Main Line Car.

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A study of automatic train operation by ATC system and fault tracing (ATC장치에 의한 자동운전 및 고장 추적에 관한 연구)

  • 김경식;강덕원;강리택;이종성
    • Proceedings of the KSR Conference
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    • 2002.10a
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    • pp.503-508
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    • 2002
  • According to passengers gain and headway's contraction, railway vehicle is required quick and correct running. The importance of ATC device was increased gradually, and also is acting important role in safe train running and efficient use in this reason. Now, railway vehicle that is manufactured or is remodeled are designed to most automatic driving system, and ATC device design direction than other device of railway vehicle influences to whole system in this reason. Also, according as system becomes complicated gradually, importance of fault tracing function fur ATC device is emphasized gradually, and in this reason research about efficient fault tracing method is to act important role heightening reliability of ATC device. In this document, that analyzing about result through examination of automatic train operation system of localization model ATC device(SG-100) and application example, and do so that investigate about efficient fault Bracing.

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Double mastering network for train communication (철도 차량용 통신 네트워트의 이중 마스터 운용 기법)

  • Ryou, Heung-Reol;Cho, Young-Jo;Oh, Sang-Rok;Hong, Dae-Sik
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.355-358
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    • 1998
  • Train control and monitoring system for the railway train requires a reliable real-time communication network. The system have various functions, diagnostics, passenger informations, and fault-tolerant controls. For this system, an international standard called TCN(Train Communication Network) is proposed by IEC and the train industries. The TCN is composed of two layers, wire train bus(WTB) and multifunction vehicle bus(MVB). This paper evaluates the performance of the proposed WTB and modified WTB. And computer simulations are performed. The evaluated results can be used for the fault tolerant network in the railway train system.

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Diagnosis of Compressor Failure by Fault Tree Analysis (FTA기법을 이용한 콤프레서 고장진단)

  • 배용환;이석희;최진원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.127-138
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    • 1994
  • The application of fault tree technique to the analysis of compressor failure is considered. The techniques involve the decomposition of the system into a form of fault tree where certain basic events lead to a specified top event which signifies the total failure of the system. In this paper, fault trees are made by using fault train of screw type air compressor failure. The fault trees are used to obtain minimal cut sets from the modes of system failure and, hence the system failure rate for the top event can be calculated. The method of constructing fault trees and the subsequent estimation of reliability of the system is illustrated through compressor failure. It is proved that FTA is efficient to investigate the compressor failure modes and diagnose system.

Construction of Event Tree & Fault Tree for Train Fire Risk Assessment (철도화재사고 위험도평가를 위한 Event Tree 및 Fault Tree 구성)

  • Kwak, Sang-Log;Wang, Jong-Bae;Lee, Bong-Seob;Park, Chan-Woo
    • Journal of the Korean Society for Railway
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    • v.11 no.6
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    • pp.530-535
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    • 2008
  • After train fire accident in Daegue, many research on train fire safety improvement have been carrying out. Since many alternative fire safety measures can be applied in our railway system, the effect of the each safety measure must be quantified prior to the safety investment. In order to estimate the effects of each safety measure quantitatively, fault trees and event trees are constructed in this study. Results can be applied for cost-benefit analysis or sensitivity analysis for safety measures in risk assessment process.

Reliability Analysis for Train Control System by Software Fault Tolerance Techniques (소프트웨어 결함허용 기법에 의한 열차제어시스템 신뢰도 분석)

  • Suh, Seog-Chul;Lee, Jong-Woo
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.1043-1048
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    • 2009
  • PES (Programmable Electronic System) is used by software development for the train control system. PES has been widely used in real world and consists of hardware, firmware and application software. The PES are easily apply to many applications because its implementation has high flexibility. Many safety critical functions are realized through software in safety critical system. Normally, it is difficult to detect failures for PES system because the PES is too sophisticated to identify sources of the failure. So, the reliability analysis is needed by using software fault tolerance techniques. Currently, there are the recovery block, distributed recovery block, N-version programming, N self-checking programming in fault tolerance techniques. In this paper, the models of recovery block and N-version programming in software fault tolerance techniques are suggested by using the Markov model. Also, the reliability in the train control system is analyzed through changing time. The fault occupancy rates of the program, adjustment test and voter are stationary. So, the relation between time and reliability is presented by using Matlab program. In the result of reliability, the reliability of recovery block is more high than N-version programming in case of the same number of substitution block.

Study on the Railway Fault Locator Impedance Prediction Method using Field Synchronized Power Measured Data (실측 동기화 데이터를 활용한 교류전기철도의 고장점표정장치 임피던스 예측기법 연구)

  • Jeon, Yong-Joo;Kim, Jae-chul
    • Journal of the Korean Society for Railway
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    • v.20 no.5
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    • pp.595-601
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    • 2017
  • Due to the electrification of railways, fault at the traction line is increasing year by year. So importance of the fault locator is growing higher. Nevertheless at the field traction line, it is difficult to locate accurate fault point due to various conditions. In this paper railway feeding system current loop equation was simplified and generalized though measured data. And substation, train power data were measured under synchronized condition. Finally catenary impedance was predicted through generalized equation. Also simulation model was designed to figure out the effect of load current for train at same location. Train current was changed from min to max range and catenary impedance was compared at same location. Finally, power measurement was performed in the field at train and substation simultaneously and catenary system impedance was predicted and calculated. Through this method catenary impedance can be measured more easily and continuously compared to the past method.

Vibration and Noise Measurement on the Driving System of Electric Train for Safety Diagnosis (전기동차 구동장치의 안전진단을 위한 진동.소음 측정)

  • 최연선;이봉현;최경긴;유원희
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.10a
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    • pp.210-215
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    • 1997
  • Safety diagnosis on the driving system of electric train is performed using the vibration and noise signals of running railway train. Safety diagnosis is tried on the viewpoints of the appreciation of superannuation and the fault diagnosis of motor, reduction gear and boggie. The appreciation of superannuation is checked by the rms vibration levels of driving parts and the fault diagnosis is done by analyzing the frequencies of the vibration signals. The methods of measuring and analyzing the signals are decided on the basis of field 1-measured signals. The results shows that the vibration levels of each parts increase as the train goes older and each parts have their own frequency patterns of the vibration. As the results, the vibration and noise can be utilized successfully for the safety diagnosis of the driving part of electric train.

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Fault diagnosis of walking beam roller bearing by FTA (FTA(Fault Tree Analysis)기법을 이용한 이송용 대부하 베어링 고장 진단)

  • Bae, Y.H.;Lee, H.K.;Lee, S.J.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.5
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    • pp.110-123
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    • 1994
  • The development of automatic production systems have required inteligent diagnostic and monitoring function to repair system failure and reduce production loss by the failure. In order to perform accurate functions of intelligent system, inferencing about total system failure and fault analysis due to each mechanical component failures are required. Also the solution about repair and maintenance can be suggested from these analysis results. As an essential component of mechanical system, a bearing system is investigated to define the failure behavior. The bearing failure is caused by lubricant system failure, metallurgical defficiency, mechanical condition(vibration, overloading, misalignment) and environmental effect. This study described roller bearing fault train due to stress variation and metallurgical defficiency from lubricant failure by using FTA.

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Calculation Method of Modification Factors for Fault Location Algorithm Using Boosting Current of Operating Electric Train in AT Feeding System (AT급전계통에서 실제 운행 중인 전기기관차 부하를 이용한 고장점 표정 알고리즘 보정계수 산출 방법)

  • Kim, Cheol-Hwan;Kim, Sung-Ryul;Kwon, Sung-Il;Cho, Gyu-Jung;Kim, Chul-Hwan;Song, In-Keun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.3
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    • pp.504-510
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    • 2016
  • In general, a fault locator is installed in Sub-Station of AT(Auto-transformer) feeding system to estimate the fault location and to protect the Korean AT feeding system. Since the line impedance characteristic is different to normal 3-phase transmission line, we need particular modification factors, which can be calculated using fault location recording data, to estimate the accurate fault location. Up to recently, forcible ground test has been used to calculate the modification factors of the fault locator. However, large amount of current is occurred when the forcible ground test is performed, and this current affects to adjacent equipments. Therefore, we proposed a novel calculation method of modification factors, arbitrary trip test, using boosting current of the operating electric train. Through several field test, we confirmed that modification factors for fault locator can be easily calculated by using proposed method. Moreover, we verified the accuracy and stability of the proposed calculation method.