The Experts below are selected from a list of 1023 Experts worldwide ranked by ideXlab platform

Hideki Arai - One of the best experts on this subject based on the ideXlab platform.

  • analysis of lightning overvoltage generated in signal cable by fdtd method and comparison of the analysis result with actual observed result
    International Conference on Lightning Protection, 2018
    Co-Authors: Tatsuya Omori, Hiroyuki Fujita, Hideki Arai
    Abstract:

    When struck by lightning, railway Signalling Equipment is sometimes damaged by lightning overvoltage through its cable. As a result, the delay of the train occurs and the stable service of the train is obstructed. Lightning overvoltage is generated in signal cables and rails was observed from 2010 to 2016, in order to quantitatively analyze lightning risk; however, lightning is a natural phenomenon, therefore, how often, where, with what intensity lightning occurs annot be controlled. So it is effective for quantitative analysis of lightning risk to establish a method to simulate the phenomenon of lightning overvoltage with computers because in the simulation, lightning condition and any other surrounding condition can be arbitrarily set. The authors constructed an analysis model to simulate the phenomenon how lightning generates overvoltage in the signal cable, and analyzed overvoltage with FDTD-method. From the comparison of the analyzed lightning overvoltage with he actual observed one, it was made clear that accuracy of the simulation is not far from the level required for its practical use.

  • Analytical study on lightning surge propagation along rail and lightning overvoltages on railway Signalling Equipment
    Electric Power Systems Research, 2012
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    Abstract The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. In general, the railway Signalling systems are set up at a wayside and directly connected to the rails through cables. The lightning surges can invade the railway Signalling systems via the cables and cause damages to the systems. Accordingly, clarifying the propagation characteristics of lightning surges along the rails is essential to develop the lightning protection measures for the railway Signalling systems. We have carried out the field tests to examine both surge impedance and surge propagation velocity of the rails. This paper proposes a calculation model of the surge propagation characteristics along the rails. The results of surge impedance and surge propagation velocity calculated by the proposed model almost agree with the experimental results. Moreover, this paper proposes a calculation model of the lightning overvoltages on the railway Signalling Equipment. The calculation model consists of the rail model and the equivalent circuit model of Signalling Equipment. We indicated the validity of the calculation model of the railway Signalling Equipment by comparing with the results of the field test. This model is applicable to the development of lightning protection measures for the railway Signalling systems.

  • development of a lightning surge calculation model for level crossing Signalling Equipment
    Quarterly Report of Rtri, 2012
    Co-Authors: Hideki Arai, Hiroyuki Fujita, Yuto Ono
    Abstract:

    The development of the effective and economical lightning protection measures is very important for railway Signalling systems because lightning damage causes railway transportation disruption. This paper proposes a calculation model for lightning overvoltages on railway level crossing Equipment. The calculation model consists of a propagation model of lightning surge along the rails and an equivalent circuit model of Equipment. The authors validated the calculation model by comparison with field test results. This model is applicable for quantitative estimation of lightning protection measures of railway Signalling Equipment.

  • Calculation model to evaluate effects of lightning protection measures on railway Signalling Equipment
    2011 International Symposium on Lightning Protection, 2011
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. The authors have conducted the field tests to investigate the surge parameters along the rails and proposed a calculation model of surge propagation characteristics along the rails. In this paper, we propose a calculation model for lightning overvoltages on the railway level crossing system as typical railway Signalling Equipment. Moreover, this paper indicates the evaluation results of lightning protection effects by using the calculation model.

  • Analytical study on lightning overvoltages of rail track and railway Signalling Equipment
    2010 30th International Conference on Lightning Protection (ICLP), 2010
    Co-Authors: Hideki Arai, Ikuo Watanabe, Hideki Motoyama, Shigeru Yokoyama
    Abstract:

    The development of the effective and economical protection measures is vital for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. In general, the railway Signalling systems are set up at a wayside and directly connected to the rails through cables. The lightning surges can invade the railway Signalling systems via the cables and cause damages to the systems. Accordingly, clarifying the propagation characteristics of lightning surges along the rails is essential to develop the lightning protection measures for the railway Signalling systems. We have carried out the field tests to examine both surge impedance and surge propagation velocity of the rails. This paper proposes a calculation model of the surge propagation characteristics along the rails. The results of surge impedance and surge propagation velocity calculated by the proposed model almost agree with the experimental results. Moreover, this paper proposes a calculation model of the lightning overvoltages on the railway Signalling Equipment. The calculation model consists of the rail model and the equivalent circuit model of Signalling Equipment. We indicated the validation of the calculation model of the railway Signalling Equipment due to the comparison with the results of the field test. This model is applicable to the development of lightning protection measures for the railway Signalling systems.

Shigeru Yokoyama - One of the best experts on this subject based on the ideXlab platform.

  • Analytical study on lightning surge propagation along rail and lightning overvoltages on railway Signalling Equipment
    Electric Power Systems Research, 2012
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    Abstract The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. In general, the railway Signalling systems are set up at a wayside and directly connected to the rails through cables. The lightning surges can invade the railway Signalling systems via the cables and cause damages to the systems. Accordingly, clarifying the propagation characteristics of lightning surges along the rails is essential to develop the lightning protection measures for the railway Signalling systems. We have carried out the field tests to examine both surge impedance and surge propagation velocity of the rails. This paper proposes a calculation model of the surge propagation characteristics along the rails. The results of surge impedance and surge propagation velocity calculated by the proposed model almost agree with the experimental results. Moreover, this paper proposes a calculation model of the lightning overvoltages on the railway Signalling Equipment. The calculation model consists of the rail model and the equivalent circuit model of Signalling Equipment. We indicated the validity of the calculation model of the railway Signalling Equipment by comparing with the results of the field test. This model is applicable to the development of lightning protection measures for the railway Signalling systems.

  • Calculation model to evaluate effects of lightning protection measures on railway Signalling Equipment
    2011 International Symposium on Lightning Protection, 2011
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. The authors have conducted the field tests to investigate the surge parameters along the rails and proposed a calculation model of surge propagation characteristics along the rails. In this paper, we propose a calculation model for lightning overvoltages on the railway level crossing system as typical railway Signalling Equipment. Moreover, this paper indicates the evaluation results of lightning protection effects by using the calculation model.

  • Analytical study on lightning overvoltages of rail track and railway Signalling Equipment
    2010 30th International Conference on Lightning Protection (ICLP), 2010
    Co-Authors: Hideki Arai, Ikuo Watanabe, Hideki Motoyama, Shigeru Yokoyama
    Abstract:

    The development of the effective and economical protection measures is vital for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. In general, the railway Signalling systems are set up at a wayside and directly connected to the rails through cables. The lightning surges can invade the railway Signalling systems via the cables and cause damages to the systems. Accordingly, clarifying the propagation characteristics of lightning surges along the rails is essential to develop the lightning protection measures for the railway Signalling systems. We have carried out the field tests to examine both surge impedance and surge propagation velocity of the rails. This paper proposes a calculation model of the surge propagation characteristics along the rails. The results of surge impedance and surge propagation velocity calculated by the proposed model almost agree with the experimental results. Moreover, this paper proposes a calculation model of the lightning overvoltages on the railway Signalling Equipment. The calculation model consists of the rail model and the equivalent circuit model of Signalling Equipment. We indicated the validation of the calculation model of the railway Signalling Equipment due to the comparison with the results of the field test. This model is applicable to the development of lightning protection measures for the railway Signalling systems.

S Fararooy - One of the best experts on this subject based on the ideXlab platform.

  • intelligent condition monitoring of railway Signalling Equipment using simulation
    Condition Monitoring for Rail Transport Systems (Ref. No. 1998 501) IEE Seminar on, 1998
    Co-Authors: H Yazdi, Clive Roberts, S Fararooy
    Abstract:

    This paper reviews the use of simulation packages for modelling and intelligent condition monitoring of railway Signalling Equipment. Track-circuits and level-crossing barrier systems are considered as two case studies in order to establish the benefits of using simulation. (5 pages)

  • condition based maintenance of railway Signalling Equipment
    Electric Railways in a United Europe 1995. International Conference on, 1995
    Co-Authors: S Fararooy, J Allan
    Abstract:

    The scope and motivation of the work reported in this paper relates to the virtues and means of active condition-based maintenance of railway Signalling Equipment, train-stops and points machines in the first instance. An overview of evolving maintenance principles are introduced and their application to railways considered. This provides the motivation for the development and implementation of modern computer-based condition monitoring techniques. These provide early warning signals which could be used to increase the reliability and hence quality of the service to passengers, as well as to complement and direct the maintenance work of permanent way and Signalling engineers in order to make efficient use of resources and save costs associated with too frequent maintenance routines.

  • condition monitoring and fault diagnosis of railway Signalling mechanical Equipment acoustic emission sensors
    Insight, 1995
    Co-Authors: S Fararooy, J Allan
    Abstract:

    Safety-critical railway Signalling Equipment at the track side, such as points machines and train-stops, are required to operate in 'fail-safe' mode, which means that if their operation is suspect, trains are not allowed to go through. These Equipments currently make up for a significant ratio of failure statistics related to delays due to Signalling problems. In order to improve the quality of service to passengers and reduce losses associated with delays, it is therefore required to predict developing faults and degradation in advance and to diagnose them using latest technology. The scope and motivation of the paper relates to condition monitoring and diagnostics of railway Signalling Equipment, using train-stops as a case study in the first instance, employing acoustic emission and other types of sensors. The electro-pneumatic operation of trainstops is firstly described, the test rig and the data acquisition and analysis system developed at the University of Birmingham are outlined. Results from the application of acoustic emission sensors on the test rig are presented. Practical issues related to the use ofAE technology, based on the experience of field trials on one of the London Underground Ltd lines, are discussed. A complementary condition monitoring technique employing neural networks which was successfully used, and further work currently being undertaken, are briefly explained.

Masaru Ishii - One of the best experts on this subject based on the ideXlab platform.

  • Analytical study on lightning surge propagation along rail and lightning overvoltages on railway Signalling Equipment
    Electric Power Systems Research, 2012
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    Abstract The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. In general, the railway Signalling systems are set up at a wayside and directly connected to the rails through cables. The lightning surges can invade the railway Signalling systems via the cables and cause damages to the systems. Accordingly, clarifying the propagation characteristics of lightning surges along the rails is essential to develop the lightning protection measures for the railway Signalling systems. We have carried out the field tests to examine both surge impedance and surge propagation velocity of the rails. This paper proposes a calculation model of the surge propagation characteristics along the rails. The results of surge impedance and surge propagation velocity calculated by the proposed model almost agree with the experimental results. Moreover, this paper proposes a calculation model of the lightning overvoltages on the railway Signalling Equipment. The calculation model consists of the rail model and the equivalent circuit model of Signalling Equipment. We indicated the validity of the calculation model of the railway Signalling Equipment by comparing with the results of the field test. This model is applicable to the development of lightning protection measures for the railway Signalling systems.

  • Calculation model to evaluate effects of lightning protection measures on railway Signalling Equipment
    2011 International Symposium on Lightning Protection, 2011
    Co-Authors: Hideki Arai, Ikuo Watanabe, Shigeru Yokoyama, Hideki Motoyama, Masaru Ishii
    Abstract:

    The development of the effective and economical protection measures is very important for the railway Signalling systems because the lightning damages cause the disruption of the railway transportation systems. The authors have conducted the field tests to investigate the surge parameters along the rails and proposed a calculation model of surge propagation characteristics along the rails. In this paper, we propose a calculation model for lightning overvoltages on the railway level crossing system as typical railway Signalling Equipment. Moreover, this paper indicates the evaluation results of lightning protection effects by using the calculation model.

Somsak Vanit-anunchai - One of the best experts on this subject based on the ideXlab platform.

  • c © S. Vanit-Anunchai This work is licensed under the Creative Commons Attribution License. Experience using Coloured Petri Nets to Model Railway
    2016
    Co-Authors: -w. S. Lin, Interlocking Tables, Somsak Vanit-anunchai
    Abstract:

    Interlocking tables are the functional specification defining the routes on which the passage of the train is allowed. Associated with the route, the states and actions of all related Signalling Equipment are also specified. It is well-known that designing and verifying the interlocking tables are labour intensive, tedious and prone to errors. To assist the verification process and detect errors rapidly, we formally model and analyse the interlocking tables using Coloured Petri Nets (CPNs). Although a large interlocking table can be easily modelled, analysing the model is rather difficult due to the state explosion problem and undesired safe deadlocks. The safe deadlocks are when no train collides but the train traffic cannot proceed any further. For ease of analysis we incorporate automatic route setting and automatic route cancelling functions into the model. These help reducing the number of the deadlocks. We also exploit the new features of CPN Tools; prioritized transitions; inhibitor arcs; and reset arcs. These help reducing the size of the state spaces. We also include a fail safe specification called flank protection into the interlocking model

  • Experience using Coloured Petri Nets to Model Railway Interlocking Tables
    Open Publishing Association, 2014
    Co-Authors: Somsak Vanit-anunchai
    Abstract:

    Interlocking tables are the functional specification defining the routes on which the passage of the train is allowed. Associated with the route, the states and actions of all related Signalling Equipment are also specified. It is well-known that designing and verifying the interlocking tables are labour intensive, tedious and prone to errors. To assist the verification process and detect errors rapidly, we formally model and analyse the interlocking tables using Coloured Petri Nets (CPNs). Although a large interlocking table can be easily modelled, analysing the model is rather difficult due to the state explosion problem and undesired safe deadlocks. The safe deadlocks are when no train collides but the train traffic cannot proceed any further. For ease of analysis we incorporate automatic route setting and automatic route cancelling functions into the model. These help reducing the number of the deadlocks. We also exploit the new features of CPN Tools; prioritized transitions; inhibitor arcs; and reset arcs. These help reducing the size of the state spaces. We also include a fail safe specification called flank protection into the interlocking model