• Title/Summary/Keyword: Fault Train

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The design concept of the event recorder system for high speed train (고속전철용 고장기록장치 시스템 설계에 관한 연구)

  • Choi Kweon-hee;Jeon Sung-hyun;Jung Byung-ho;Lee Byung-seok;Han Dong-in
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.72-76
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    • 2005
  • This event recorder system, owing to the advancement of communication technology, is independently installed in most on-board electronics and given integrated management by on-board monitoring equipments. However, since the safety oriented equipments such as signalling devices, train protection systems, and train radios have been mounted on trains recently" the existing on-board monitoring device is no longer reliable enough for permanent preservation of data from train crashes or fires. This study has pointed out the problems mentioned above and described the designing concept of the fault recording system for high-speed trains for effective utilization of the train management program.

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A Study on the Fault analysis of train control system by CAMS (CAMS에 의한 고속선 열차제어시스템 장애 분석에 관한 연구)

  • Kim, Yong-Kyu;Baek, Jong-Hyun;Ryu, Sang-Hwan
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1436-1441
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    • 2006
  • In this paper, Computer-aided Maintenance Equipments, which are being used in High Speed Line Train Control System, are applied to analyze failures in train control systems, resulting in long time delays of trains. It can be expected to extend and apply CAMS(Computer Aided Maintenance System) in the hereafter efficient operation and maintenance of high speed railway train control systems, by comparison between the analysis result of fundamental causes, from high speed railway train control system failure occurred during the operational process, and predictive result of failure causes, based on the recording data of CAMS when failures were occurred.

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Reliability Assessment of Railway Power System by using Tree Architecture (Tree 구조를 이용한 전철급전시스템의 신뢰도 평가)

  • Cha, Jun-Min;Ku, Bon-Hui
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.9-15
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    • 2010
  • As catenary supply electric power directly to the railway system, it is very important to prevent an accident of a catenary for appropriate train operation. This paper proposed the assessment the outage data for "British Catenary Safety Analysis Report" and Korean data to compare the reliability of the railway system. The analyzed data were applied to Event Tree and Fault Tree algorithm to calculate the reliability indices of railway system. Event tree is created and gate results of fault tree analysis are used as the source of event tree probabilities. Fault tree represents the interaction of failures and basic events within a system. Event Tree and Fault Tree analysis result is helpful to assess the reliability to interpreted. The reliability indices can be used to determine the equipment to be replaced for the entire system reliability improvement.

Voltage rising simulation due to the ground fault in DC traction system (직류 급전시스템에서의 지락고장에 따른 전압상승 시뮬레이션)

  • Jung, Ho-Sung;Han, Moon-Seob;Park, Young;Chung, Sang-Gi;Kwon, Sam-Young
    • Proceedings of the KIEE Conference
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    • 2008.10c
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    • pp.215-217
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    • 2008
  • DC fraction system can damage human and other facilities due to the rising of rail potential. Therefore the earth fault detection relay protects system using rail potential induced in train operation and ground fault. However the conventional protection system cannot operate due to the fault resistance and might operate unwanted voltage rising due to the other substation ground fault. So this paper models DC traction system using PSCAD/EMTDC and simulates the rail potential rising. We can estimate the rail potential rising in DC traction system through the various simulation.

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Fault Diagnosis System for Traction Motor in Electric Multiple Unit (전동차 견인전동기 고장진단시스템)

  • Park, Hyun-June;Jang, Dong-Uk;Lee, Gil-Hun;Choi, Jong-Sun;Kim, Jung-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07a
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    • pp.518-521
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    • 2003
  • A new measurement system was developed by fault diagnosis system for traction motor using current signal analysis. The motor current signature analysis method is used for traction motor fault diagnosis. The diagnosis system program is constructed by artificial neural networks algorithm, those results from the program are used to train neural networks. The trained neural networks have the ability to compute adaptive results for non-trained inputs, and to calculate very fast due to original parallel structure of neural networks with high accuracy within destined tolerance. This system suggested that available test for checking, the probable extent of aging, and the rate of which aging is taking place.

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Test-Generation-Based Fault Detection in Analog VLSI Circuits Using Neural Networks

  • Kalpana, Palanisamy;Gunavathi, Kandasamy
    • ETRI Journal
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    • v.31 no.2
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    • pp.209-214
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    • 2009
  • In this paper, we propose a novel test methodology for the detection of catastrophic and parametric faults present in analog very large scale integration circuits. An automatic test pattern generation algorithm is proposed to generate piece-wise linear (PWL) stimulus using wavelets and a genetic algorithm. The PWL stimulus generated by the test algorithm is used as a test stimulus to the circuit under test. Faults are injected to the circuit under test and the wavelet coefficients obtained from the output response of the circuit. These coefficients are used to train the neural network for fault detection. The proposed method is validated with two IEEE benchmark circuits, namely, an operational amplifier and a state variable filter. This method gives 100% fault coverage for both catastrophic and parametric faults in these circuits.

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Bearing ultra-fine fault detection method and application (베어링 초 미세 결함 검출방법과 실제 적용)

  • Park, Choon-Su;Choi, Young-Chul;Kim, Yang-Hann;Ko, Eul-Seok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.1093-1096
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    • 2004
  • Bearings are elementary machinery component which loads and do rotating motion. Excessive loads or many other reasons can cause incipient faults to be created and grown in each component. Moreover, it happens that incipient faults which were caused by manufacturing or assembling process' errors of the bearings are created. Finding the incipient faults as early as possible is necessary to the bearings in severe condition: high speed or frequently varying load condition, etc. How early we can detect the faults has to do with how the detection algorithm finds the fault information from measured signal. Fortunately, the bearing fault signal makes periodic impulse train. This information allows us to find the faults regardless how much noise contaminates the signal. This paper shows the basic signal processing idea and experimental results that demonstrate how good the method is.

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Study on the Quantification of Failure Rate for Safety-critical Fault-tolerant USN System (안전필수 결함허용 USN시스템의 고장률정량화에 관한 연구)

  • Shin, Duc-Ko;Shin, Kyung-Ho;Jo, Hyun-Jeong;Song, Yong-Soo
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.1414-1419
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    • 2011
  • In this paper we study the modeling to quantitatively assess the failure rate of USN system designed for fault-tolerant architecture, aiming at applying the world's best domestic USN technology to safety-critical railways. In order to apply the USN system to the safety-critical field like a train control sector that the failures of controllers may cause severe railway accidents such as train collision and derailment, the quantitative reliability and safety evaluation recommended in IEC 62278 must be preceded. We also develop the evaluation model for overall system failure rate for the distributed network structure, which is the characteristics of USN system. Especially, we allocate reliability targets to component units, and present an availability evaluation plan through the plan on the quantitative achievement of failure rate for sensor nodes, gateways, radio-communication network and servers, along with the failure rate model of the overall system considering network operational features.

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Fault Diagnosis and Performance Evaluation of Auxiliary Block for Korean High-Speed Railway (한국형 고속열차 보조전원장치 고장진단과 성능평가)

  • 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
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    • v.9 no.5 s.36
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    • pp.612-617
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    • 2006
  • 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.

Fault Analysis of Electric Equipment Using Vehicle Signal (차량신호를 이용한 주요 전장품의 고장 분석)

  • Han, Young-Jae;Kim, Ki-Hwan;Kim, Sang-Soo;Lee, Byoung-Seog;Jung, Sang-Hun;Cho, Byoung-Chan
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1488-1494
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    • 2006
  • The most important thing to secure safety and reliability of railway vehicles is to verify performance characteristics of equipments, and related companies or research institutes had many efforts to verify performances and functions of equipments synthetically and efficiently. KHST(Korean High Speed Train) has been developed by KRRI(Korea Railroad Research Institute). An electric railway system is composed of high-tech subsystems, among which main electric equipment such as transformers and converter are critical components determining the performance of rolling stock. We developed a measurement system for on-line test and evaluation of performances of KHST. The measurement system is composed of software part and hardware part. Perfect interface between multi-users is possible. A new method to measure temperature was applied to the measurement system. By using the system, fault diagnosis and performance evaluation of electric equipment in Korean High Speed Train was conducted during test running.

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