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Extending emergency repair response times for railway track switches through multi-channel redundancy of functional subsystems
journal contributionposted on 09.04.2018, 10:38 authored by Sam Bemment, Tim HarrisonTim Harrison, Roger Goodall, Christopher WardChristopher Ward, Roger Dixon
A novel track switch concept has been developed at Loughborough University, which allows parallel-channel, fault-tolerant functions for the first time. This paper demonstrates, through mathematical modelling, real-world data and conservative assumptions, that using a multi-channel, fault-tolerant switching concept can allow an increase in switch availability over baseline scenarios. Performance of four existing switch types is analysed for baseline performance using field data. Multi-channel architectures are then analysed across a range of reactionary maintenance regimes. Availability measures are obtained which show the range of possible switch availability against maintenance response times. The most significant improvements occur when maintenance practice is also revised, the novel system offering the option to run to subsystem failure and remain functional. Results indicate that for multi-channel installations, gains in system availability are possible even when emergency response times are set orders of magnitude longer than currently achieved, indicating a signifi cant reduction in ongoing maintenance commitment. The work also demonstrates that the particular choice of subsystem architecture is of low significance.
This research was supported 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’.
- Mechanical, Electrical and Manufacturing Engineering