Filters








90 Hits in 3.8 sec

A New Switch and Crossing Design: Introducing the Back to Back Bistable Switch

J. -Y. Shih, R. Ambur, H. C. Boghani, R. Dixon, E. Stewart
2020 Journal of Civil Engineering and Construction  
The paper explains the concept and identifies the design guidelines for a current layout and uses vehicle/turnout dynamic modelling to predict wheel rail forces through a switch to identify performance  ...  This offers a major reduction on maintenance cost of future S&Cs.  ...  A model of a railway track turnout of 760 m radius and 1:15 crossing angle, as defined by European standards, was developed.  ... 
doi:10.32732/jcec.2020.9.4.175 fatcat:gpzl2r47ebbexkdast3wonrah4

On the Fault Detection and Diagnosis of Railway Switch and Crossing Systems: An Overview

Moussa Hamadache, Saikat Dutta, Osama Olaby, Ramakrishnan Ambur, Edward Stewart, Roger Dixon
2019 Applied Sciences  
Railway switch and crossing (S&C) systems have a very complex structure that requires not only a large number of components (such as rails, check rails, switches, crossings, turnout bearers, slide chair  ...  The main contribution of this paper is to present a comprehensive review of the existing FDD techniques for railway S&C systems.  ...  Linear Actuation In railway S&C systems comprising linear actuators, such as electromechanical, electropneumatic, and electrohydraulic actuators, the switch rails slide from one side to the other depending  ... 
doi:10.3390/app9235129 fatcat:cebbtv7g3nfn5nng7kvazoxb6q

The Fundamental Approach of the Digital Twin Application in Railway Turnouts with Innovative Monitoring of Weather Conditions

Arkadiusz Kampczyk, Katarzyna Dybeł
2021 Sensors  
The aim of the research is to present elements of a fundamental approach of applying digital twins to railway turnouts requiring the consideration and demonstration of rail temperature conditions as a  ...  The realization of effective, reliable and continuous observations for the spatial analysis and evaluation of the technical condition of railway turnouts is one of the factors affecting safety in railway  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s21175757 pmid:34502648 pmcid:PMC8434523 fatcat:itgdvd7cprghnb6xcjtoa33fdu

Rethinking rail track switches for fault tolerance and enhanced performance

Samuel D Bemment, Emma Ebinger, Roger M Goodall, Christopher P Ward, Roger Dixon
2016 Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit  
The authors also acknowledge the support of the UKs Future Railway, for providing funding towards concept demonstrator design and construction (http://www.futurerailway.org/).  ...  Board) in grant number EP/I010823/1, for the project REPOINT: Redundantly engineered points for enhanced reliability and capacity of railway track switching.  ...  Existing track switch systems are the result of the evolution of a single design solution dating to early mining railways in the 1700 s. 12 The operating parameters of a modern railway system are much  ... 
doi:10.1177/0954409716645630 fatcat:7l7ogocgavekrpn5gslxnwnnoq

Rethinking Rail Track Switches for Fault Tolerance and Enhanced Performance

Tim Harrison, Samuel D. Bemment, Emma Ebinger, Roger M. Goodall, Christopher P. Ward, Roger Dixon
2016 IFAC-PapersOnLine  
The authors also acknowledge the support of the UKs Future Railway, for providing funding towards concept demonstrator design and construction (http://www.futurerailway.org/).  ...  Board) in grant number EP/I010823/1, for the project REPOINT: Redundantly engineered points for enhanced reliability and capacity of railway track switching.  ...  Existing track switch systems are the result of the evolution of a single design solution dating to early mining railways in the 1700 s. 12 The operating parameters of a modern railway system are much  ... 
doi:10.1016/j.ifacol.2016.10.564 fatcat:hsu65erq2bcphf2hdq3imqbmte

Benefits of mechatronically guided vehicles on railway track switches

Nabilah Farhat, Christopher P Ward, Roger Dixon, Roger M Goodall
2018 Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit  
and crossings (S&C), whereas mechatronically-guided railway vehicles promise a large advantage over conventional vehicles in terms of reduced wheel-rail wear, improved guidance and opening new possibilities  ...  Previous research in this area has looked into guidance and steering using MBS models of mechatronic rail vehicles of three different mechanical configurations -secondary yaw control (SYC), actuated solid-axle  ...  Acknowledgements The research has been supported by a Loughborough University studentship and European Unions Horizon 2020 : the Framework Programme for Research and Innovation (2014-2020) through grant  ... 
doi:10.1177/0954409718801265 fatcat:pa4kxysccfgm3mddvf6ht4e3ye

Predicting component reliability and level of degradation with complex-valued neural networks

Olga Fink, Enrico Zio, Ulrich Weidmann
2014 Reliability Engineering & System Safety  
MLMVN is applied to a case study of predicting the level of degradation of railway track turnouts using real data. The performance of the algorithms is first evaluated using benchmark study data.  ...  For the railway turnout application, MLMVN confirm the good performance in the long-term prediction of degradation and does not show accumulating errors for multi-step ahead predictions.  ...  The authors would like to thank the BLS AG for providing the data for this research project. References  ... 
doi:10.1016/j.ress.2013.08.004 fatcat:yd5df4muhzay5bkamhlocsccze

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

Mehmet Hamarat, Sakdirat Kaewunruen, Mayorkinos Papaelias, Mika Silvast
2019 Applied Sciences  
A railway turnout is an essential infrastructure for managing railway traffic flexibility.  ...  Consequently, a numerical model capable of determining impact forces was developed here, to evaluate the dynamic behaviors of a railway turnout and their effects on such turnout components as bearers,  ...  The JSPS financially supports this work as part of the research project, entitled "Smart and reliable railway infrastructure".  ... 
doi:10.3390/app9194080 fatcat:6ikvnzowurfghpvwlgautqp2xy

Worst-Case Execution Time Calculation for Query-Based Monitors by Witness Generation [article]

Márton Búr and Kristóf Marussy and Brett H. Meyer and Dániel Varró
2021 arXiv   pre-print
Moreover, in case the runtime graph model outgrows the size that was used to determine WCET at design time, our approach provides a fast but more conservative recomputation of safe execution time bounds  ...  This allows the systematic generation of input graph models up to a specified size (referred to as witness models) for which the monitor is expected to take the most time to complete.  ...  On a railway track, a misaligned turnout (MT) refers to a state where a turnout is set to a direction that differs from the direction of an incoming train.  ... 
arXiv:2102.03116v1 fatcat:v66xyjydrfgerpnosiztql7kq4

Quantifying the reliability of fault classifiers

Olga Fink, Enrico Zio, Ulrich Weidmann
2014 Information Sciences  
We apply the approach to a case of fault diagnosis in railway turnout systems and compare the results obtained with both extreme learning machines and echo state networks.  ...  The average accuracy of a classifier on a test set of data patterns is often used as a measure of confidence in the performance of a specific classifier.  ...  The authors would like to thank BLS AG for providing the data for this research project.  ... 
doi:10.1016/j.ins.2013.12.008 fatcat:rx75v3mywjh6nlouxfh3l32cqq

Train-Induced Vibrations on Urban Metro and Tram Turnouts

Stefano Bruni, Ioannis Anastasopoulos, Stefano Alfi, André Van Leuven, Marios Apostolou, George Gazetas
2009 Journal of transportation engineering  
The first is based on a multibody model of the trainset and of wheel-rail contact, utilizing a simplified finite element model for the turnout.  ...  of railway tracks.  ...  Acknowledgments The work presented in the paper was performed within the project "TURNOUTS," funded by the European Community ͑Contract No. TST3-CT-2003-505592͒.  ... 
doi:10.1061/(asce)te.1943-5436.0000008 fatcat:kjagzkfiunei5adljvjynjz2ty

The optimal strength of shear pins: Requirements in point run-throughs

Thomas Colantuono, Ilaria Grossoni, Paul Allen, Paul Molyneux-Berry, Philip Borczyk
2016 Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit  
Mathematical modelling work has been carried out to investigate the potential for a revision to the strength of shear pins used in London Underground Switch and Crossing drives to protect against run-through  ...  Abstract Mathematical modelling work has been carried out to investigate the potential for a revision to the strength of shear pins used in London Underground Switch and Crossing drives to protect against  ...  This suggests that 50kN may be a sensible target value for a future shear pin design.  ... 
doi:10.1177/0954409716682657 fatcat:tckk7d557fcx3ked4liwwjiiru

Degradation Detection Method for Railway Point Machines [article]

Chong Bian, Shunkun Yang, Tingting Huang, Qingyang Xu, Jie Liu, Enrico Zio
2018 arXiv   pre-print
Point machines (PMs) are used for switching and locking railway turnouts, and are considered one of the most critical elements of a railway signal system.  ...  The failure of the point mechanism directly affects the operation of the railway and may cause serious safety accidents. Hence, there is a need for early detection of the anomalies in PMs.  ...  The PM is the actuator of the turnout system, as shown in Fig. 3 , and it provides traction for the to-and-fro movement of the tongue rail to complete the conversion of the turnout position.  ... 
arXiv:1809.02349v1 fatcat:fdtyxwbonjeffne5tgdsz4e6ei

A Review of Railway Track Laboratory Tests with Various Scales for Better Decision-Making about More Efficient Apparatus Using TOPSIS Analysis

Vahid Najafi Moghaddam Gilani, Mohammad Habibzadeh, Seyed Mohsen Hosseinian, Reza Salehfard, Yi Zhang
2022 Advances in Civil Engineering  
directions, scale of apparatuses, static and dynamic simulated loads and other environmental and geometric conditions, the best apparatuses on a laboratory scale are recommended for simulating vertical  ...  the weaknesses of this apparatus, it can be turned into the most comprehensive laboratory apparatus to simulate the loading of railway tracks with a scale of 1 : 5.  ...  As can be seen, due to the passage of the train, a very longitudinal force has been created in a few sleepers ahead of the train. Longitudinal Forces at Railway Switches and Turnouts.  ... 
doi:10.1155/2022/9374808 fatcat:355pzbqphfcspl7c2eyhk2dt34

Fast estimation of the derailment risk of a braking train in curves and turnouts

Nico Burgelman, Zili Li, Rolf Dollevoet
2016 International Journal of Heavy Vehicle Systems  
This study quantifies these effects for a train that begins braking when steadily curving and for a train that brakes upon entering a turnout.  ...  Our approach allows distinguishing between the effects of braking and the transient effects of entering the turnout.  ...  This turnout was described as heavily worn and was on the limit of the safety criteria for profile change. Vehicle model The vehicles modeled are those of the VIRM trains of the Dutch Railways.  ... 
doi:10.1504/ijhvs.2016.077320 fatcat:u2mlffax4fd3zkshqlnn6zifwe
« Previous Showing results 1 — 15 out of 90 results