Monitoring Wheel Defects On A Metro Line:
System Description, Analysis And Results
Author(s)
M. Seco, E. Sanchez & J. Vinolas
Abstract
This paper presents a system developed to monitor wheel defects on metro
vehicles in order to reduce annoyance and infrastructural damage due to noise
and vibrations. Information about the wheel state and its evolution can be added
to the mere mileage to improve the efficiency of the reprofiling decisions. In
addition, sudden defects, that could potentially be severe, are detected and an
alarm is raised to take the necessary actions.
Some other systems have been developed to monitor wheel state by means of
measuring the vibrations or noises generated by vehicles; however, the case of a
metro is somewhat distinct. Wheel thread defects on a metro vehicle are not
necessarily related to overloads or rolling contact fatigue. Damage to
infrastructure and noise emission generated by small defects are particularly
important due to the high frequency of the service and the proximity of the track
to residential buildings, especially in the case of an open-air section that runs
though a neighbourhood as some sections of the Metrobilbao.
The system measures vibrations at a specific location on the rail as the vehicle
passes over it, then analyzes these signals and stores the information in a specific
database that can be easily queried from any computer on the intranet. The
system has been installed on the Metrobilbao line and tested for three years.
During this period, more than 8500 trains, or 272000 wheels, have passed over
the accelerometers and corresponding data was stored in a database. 448 wheels
threads were physically measured in order to check the accuracy of the system.
This data has been used to fit the statistics for new or newly machined wheels
and estimate the alarm threshold, and finally tuned in agreement with the
maintenance workshop.
Keywords: wheelflat, monitoring, wheel/rail contact.
Keywords
wheelflat, monitoring, wheel/rail contact.
Related Book
Other papers in this volume
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