Author(s): K. C. Labropoulos, P. Moundoulas & A. Moropoulou
The preventive maintenance of rails is necessary for safe, successful and
economical railway performance and operations.
Rolling contact fatigue (RCF)
is one of the main issues that concern the head of the railway.
RCF defects can propagate inside the material with the risk of damaging the rail,
and thus they need to be monitored, categorized, evaluated, and treated through a
comprehensive maintenance system.
In a previous work with the Athens Metro,
an innovative monitoring system was developed based on the capability of
non-destructive techniques, such as IR thermography, to inspect and identify
defects at early stages and reveal the activated paths of fracture (Moropoulou A.,
Avdelidis N., et al.
Thermosense XXVII, 5782, 371-378, 2005).
In the present
work with the Athens Piraeus Electric Railways S.A.
this system is further
integrated into a complete system consisting of three components.
surveillance component identifies the rail defects and includes non-destructive
techniques, such as visual inspection, infra-red thermography, ultrasonics, fiber
optics microscopy, and ACFM.
The data management component receives
information from the various defect identification techniques, categorizes them
and stores them for further use.
The defect warning component uses risk indices
such as defect level indices, defect extent indices, and risk threshold values, in
order to evaluate the significance of the observed defects.
All three components
are part of a decision making system that monitors the development of defects,
warns for significant threats and schedules rail maintenance.
preventive rail maintenance, rail defect management, risk indices.
Size: 373 kb
Paper DOI: 10.2495/978-1-84564-496-3/10
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