Condition monitoring of audio frequency track circuits

2008 ◽  
Author(s):  
P.F. Weston ◽  
J. Chen ◽  
E. Stewart ◽  
C. Roberts
Keyword(s):  
Condition Monitoring ◽  
Audio Frequency ◽  
Track Circuits

Comparative analysis of modern jointless audio frequency track circuits

2019 ◽  
pp. 59-63 ◽  
Author(s):  
Valeriy Alexandrovich Sisin ◽  
◽  
Maxim Igorevich Shestakov ◽  
Keyword(s):  
Comparative Analysis ◽  
Audio Frequency ◽  
Track Circuits

scholarly journals Mapping of the electromagnetic environment on the railway: Condition monitoring of signalling assets

2018 ◽  
Vol 234 (3) ◽  
pp. 246-256
Author(s):  
Alexander Knight-Percival ◽  
Christopher Johnson ◽  
Benjamin Richards ◽  
Scott Palmer ◽  
Nicholas Bowring
Keyword(s):  
Condition Monitoring ◽  
Detection System ◽  
Low Cost ◽  
Capital Outlay ◽  
Electromagnetic Environment ◽  
Analysis Techniques ◽  
Track Circuits ◽  
Condition Monitoring Systems ◽  
Advanced Analysis ◽  
Track Circuit

Conventional track circuit condition monitoring systems are fixed at the wayside, with each installation reporting on a single track circuit. In this work, we present a custom-built, sensitive, magnetic field detection system, which can be fitted to the underside of a rail vehicle. With this system installed, some characteristics of an operating track circuit can be monitored from the vehicle whilst it is in motion. By using appropriate analysis techniques, it is possible to identify the signatures of equipment relating to audio frequency track circuits, the topic of this work. Analysing the signatures of track circuit equipment demonstrated that there were clear differences between track circuit assets. By building on other research into the behaviours of failing track circuits, and continuing to conduct this research, the authors believe that it is possible, and beneficial, to perform condition monitoring of track circuits from low-cost equipment mounted on the train. Coupling this with advanced analysis techniques will allow predictive maintenance of track circuits with very little capital outlay.

scholarly journals Reducing noise influence on an audio frequency track circuit

2019 ◽  
Vol 294 ◽  
pp. 03015
Author(s):  
Inna Saiapina ◽  
Mykhailo Babaiev ◽  
Olha Аnanіevа
Keyword(s):  
Electromagnetic Interference ◽  
Pulse Generator ◽  
Signal To Noise Ratio ◽  
Single Pulse ◽  
Audio Frequency ◽  
Railway Transport ◽  
Traction Current ◽  
Useful Signal ◽  
Track Circuits ◽  
Track Circuit

In connection with electromagnetic interference influence on the track circuits, the purpose of the research is finding the means to increase the noise immunity of an audio frequency track circuit. The authors propose a new engineering solution, which enables reducing the effect of noises on the input of the track receiver in the intervals between signal current pulses. The proposed noise-immune audio frequency track circuit is based on inserting a delay line, an adjustable single-pulse generator and a controlled electronic switch into the existing audio frequency track circuit equipment. To analyze its efficiency, the operation of the audio frequency track circuit was simulated under conditions of traction current disturbances, impulse and fluctuation interferences with the known parameters. The results show that proposed device for railway transport allows to increase a signal-to-noise ratio on the track receiver input from 8% to 30%, depending on the interference parameters and the level of the useful signal.

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