• Title/Summary/Keyword: Fault Train

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Vibration Signal Analysis of Running Electric Train using Adaptive Signal Processing (적응신호처리에 의한 주행전기동차의 진동신호해석)

  • 최연선
    • Journal of the Korean Society for Railway
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    • v.2 no.2
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    • pp.13-20
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    • 1999
  • The vibration signals of driving parts of electric train are distorted its signal patterns due to the impact components, which occurs when wheel passes rail joints. An elimination method of the impact components is investigated using adaptive signal processing technique in this study The result shows that adaptive interference canceling method seems to be more effective than line enhancement technique. The application of adaptive interference canceling method to the signal measured at bogie shows that the extractions of the signals of driving parts of traction motor, reduction gear, and axle bearing are successful. Therefore, only the signals of bogie, which is the place to attach an accelerometer easily, is sufficient for the fault diagnosis and the safety evaluation of electric train. Also, adaptive interference canceling method can be applicable to evaluate the performance of vibration isolation between bogie and car body and to investigate the characteristics of indoor sound.

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A study on dynamic behavior in tractive and braking states of tilting train (틸팅차량의 견인 및 제동 상황시의 동적 특성에 관한 연구)

  • Park, J.Y.;Jung, I.H.;Lee, J.H.;Park, T.W.;Kim, S.W.;Kim, Y.G.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.1107-1111
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    • 2004
  • Tilting train improves a traveling velocity through giving a tilt the car-body without ride comfort deterioration in curve. Dynamic behavior in acceleration or deceleration will show quite another feature in constant velocity. In this study, we see through the dynamic behavior due to a variation of tractive force and braking force in Korean Tilting Train. Hence we compose of 3D dynamic model, as well as we check upon the property in service tractive condition and unique tractive condition with a fault motor. Besides we check upon the property in service braking condition and unique braking condition with a fault system. This study has the meaning with reference data of developing Korean Tilting Train test traveling.

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Fault-tolerant Design Concept of Safety Critical System for Automatic Train Control System (자동열차제어장치의 Fault-tolerant 설계안)

  • 황종규;이종우;오석문;김영훈
    • Proceedings of the KSR Conference
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    • 1999.05a
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    • pp.299-306
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    • 1999
  • The ${\mu}$-processor based-controlled system is widely used in railway signaling system. The railway signaling systems are highly required safety and reliability. It is necessary to have a fault-tolerant and fail safe concept in ${\mu}$-processor based railway signaling system. In this paper, several architectures and circuits of fault-tolerant computer system is reviewed. The basic concept of the fault-tolerant computer system will be adapted total self checking, strong fail safe, fault display circuit, logic testing circuit and system switching concepts.

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Reliability Analysis of Slab Transfer Equipment in Hot Rolling Furnace (열간압연 가열로 슬라브 이송장치 신뢰도 해석)

  • Bae, Young-Hwan
    • Journal of the Korean Society of Safety
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    • v.21 no.1 s.73
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    • pp.6-14
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    • 2006
  • The development of automatic production systems have required intelligent diagnostic and monitoring functions to overcome system failure and reduce production loss by the failure. In order to perform accurate operations of the intelligent system, implication about total system failure and fault analysis due to each mechanical component failures are required. Also solutions for repair and maintenance can be suggested from these analysis results. As an essential component of a mechanical system, a bearing system is investigated to define the failure behavior. The bearing failure is caused by lubricant system failure, metallurgical deficiency, mechanical condition(vibration, overloading, misalignment) and environmental effects. This study described slab transfer equipment fault train due to stress variation and metallurgical deficiency from lubricant failure by using FTA.

Implementation of High Reliable Fault-Tolerant Digital Filter Using Self-Checking Pulse-Train Residue Arithmetic Circuits (자기검사 Pulse별 잉여수연산회로를 이용한 고신뢰화 Fault Tolerant 디지털필터의 구성에 관한 연구)

  • 김문수;손동인;전구제
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.25 no.2
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    • pp.204-210
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    • 1988
  • The residue number system offers the possibility of high-speed operation and error detection/correction because of the separability of arithmetic operations on each digit. A compact residue arithmetic module named the self-checking pulse-train residue arithmetic circuit is effectively employed as the basic module, and an efficient error detection/correction algorithm in which error detection is performed in each basic module and error correction is performed based on the parallelism of residue arithmetic is also employed. In this case, the error correcting circuit is imposed in series to non-redundant system. This design method has an advantage of compact hardware. Following the proposed method, a 2nd-order recursive fault-tolerant digital filter is practically implemented, and its fault-tolerant ability is proved by noise injection testing.

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A Study on Fault Tree Construction for Track Worker's Risk Assessment (선로 작업자 위험도 예측을 위한 고장수목 구성 연구)

  • Kwak Sang-Log;Wang Jong-Bae;Park Chan-Woo;Cho Yuen-Ok
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.123-126
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    • 2005
  • Recently many accidents have been occurred on track workers, these accidents have strong relationship with increase of train speed, electrification and multiple track portion. As a first step for the safety management, domestic and abroad track worker accidents data are analysed for the risk estimation of track worker. Analysis results shows that contact between track worker and train is the dormant reason. In order to reduce dormant reason fault trees are constructed in this study.

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Radio Communication Based Train Control system architecture and handoff scheme for supporting the safety and reliability (안정성과 신뢰성을 고려한 무선통신기한 열차제어시스템 (Radio CBTC) 구조 및 핸드오프 방법)

  • 윤용기;정락교;이병송;최규형;황현철;이재호;곽경섭
    • Proceedings of the KSR Conference
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    • 2000.11a
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    • pp.594-601
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    • 2000
  • Communication Based Train Control System supports the easy maintenance & management and also have the capability to send more informations than the existing one but is less expensive. Tolerance against fault/failure and reliable data transmission are very important issues with this system since it has the responsibility of man's safety. In this paper, we suggested the schemes to support the reliable transmission quality and fault safety. Also we verified through simulation.

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FTA 기법을 이용한 Compresson고장 진단

  • 배용환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.04b
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    • pp.305-309
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    • 1993
  • The application of fault tree technique to the analysis of compressor failure is considered. The techniques involve the decomposition of the system into a logic diagram or fault tree in whichcertain basic or primary events lead to a specified top event which signifiss the total failure of the system. The fault trees are used to obtain miniumal cut sets from whichthe modes of system failure and, hence the reliability 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 a compressor failure. FTA is roved to be efficient to investigate the compressor fault train.

Study on Fault Diagnosis Method of Train Communication Network applied to the prototype Korean High Speed Train

  • Cho, Chang-Hee;Park, Min-Kook;Kwon, Soon-Man;Kim, Yong-Ju;Kim, Sung-Shin
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2169-2173
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    • 2003
  • The development project of Korean High Speed Train (KHST) was started in 1996. As a national research project, the KHST project aims for a development of the next generation prototype train that has a maximum speed of 350 km/h. The development process of prototype KHST including 7 vehicles was completed last year and currently the prototype train is on its way of test running over the test track with gradually increased speed. The prototype KHST uses the real time network called TCN (Train Communication Network) for exchanging information between various onboard control equipments. After 10 years of development and modification period, TCN was confirmed as international standard (IEC61375-1) for the electrical railway equipment train bus. In the prototype KHST, all major control devices are connected by TCN and exchange their information. Such devices include SCU (Supervisory Control Unit), ATC (Automatic Train Control), TCU (Traction Control Unit), and so forth. For each device that sends and receives data using TCN, a device has to find out whether TCN is in normal or failure state before its data exchange. And also a device must have a proper method of data validation that was received in a normal TCN state. This is a one of the major important factors for devices using network. Some misleading information can lead the entire system to a catastrophic condition. This paper briefly explains how TCN was implemented in the prototype KHST train, and also shows what kind of the fault diagnosis method was adopted for a fail safe operation of TCN system

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A Study on Implementation of LV circuit analysis simulator for Reliability Evaluation (신뢰성 평가를 위한 LV 회로 분석시뮬레이터 구현에 관한 연구)

  • 장영건;조경환;박계서;최권희
    • Proceedings of the KSR Conference
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    • 2000.11a
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    • pp.602-609
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    • 2000
  • This study is concerned with analysis and reliability evaluation of LV circuit in Cab Cubicle system which controls train to keep safety in High Speed Train. LV circuit is operated with diagnosis system as safety system. In this paper, we suggest a design and an implementation method to analyze LV circuit or trace fault area in LV circuit. This simulator uses 28 package modules and examines input and output by equations. So, user can trace where is fault area. The implemented system can be expected to be useful for long term test and evaluation of circuit in high speed train systems. We expect reduction to diagnosis area or repair time by this simulator.

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