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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20740

Title: Extending maintenance intervals of track switches utilising multi-channel redundancy of actuation and sensing
Authors: Bemment, Samuel D.
Goodall, Roger M.
Ebinger, Emma
Ward, Christopher P.
Dixon, Roger
Keywords: Track switch
Multi-channel redundancy
Fault tolerance
Issue Date: 2015
Publisher: © The Japan Society of Mechanical Engineers
Citation: BEMMENT, S.D. ...et al., 2015. Extending maintenance intervals of track switches utilising multi-channel redundancy of actuation and sensing. Presented at The International Symposium on Speed-up and Sustainable Technology for Railway and Maglev Systems (STECH 2015), Chiba, Japan, Nov 10-12th.
Abstract: A concept for a novel track switch arrangement has been developed at Loughborough University, which, through a novel locking arrangement, allows parallel, multi-channel actuation and locking functions for the first time. This switch has been developed as part of the REPOINT project, and is referred to as the REPOINT switch. Existing track switches generally use a single-channel actuator and lock, and undergo an intensive maintenance and inspection regime to ensure an acceptable level of reliability/availability. This paper demonstrates, through mathematical modelling with very conservative assumptions, that an increase in switch availability is possible alongside a corresponding decrease in ongoing maintenance intensity using the REPOINT multi-channel approach. The paper firstly introduces the theory behind the design of the REPOINT switch, using a switch with 2-out-of-3 redundant actuation and sensing channels as an example. An existing switch is analysed using real-world data as a benchmark. Availability is determined by the target time in which Maintenance Teams must have replaced any failed components, expressed herein as τ. Availability measures are obtained as functions of τ which show the range of possible switch availability against maintenance response times, for the given set of assumptions. The results show that for a REPOINT installation, gains in system availability are possible even when response times are set many times longer than current standards, indicating a significant reduction in ongoing maintenance cost.
Description: This is a conference paper.
Sponsor: The authors wish to acknowledge the financial support provided by the United Kingdom EPSRC (Engineering and Physical Sciences Research Council) and the United Kingdom RSSB (Railway Safety and Standards Board) in grant number EP/I010823/1, for the project titled REPOINT: Redundantly engineered points for enhanced reliability and capacity of railway track switching.
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/20740
Publisher Link: http://shinsen.biz/stech2015/
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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