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- Title
Condition Monitoring of Railway Wheels and No Fault Found Problems.
- Authors
Granström, Rikard; Söderholm, Peter
- Abstract
Defective railway wheels can cause severe damages to both track and vehicle items, which in worst case can lead to derailments with extensive losses. Wheel impact detection systems are intended to support prevention of railway damages and its related losses, through recognition of wheel defects and generation of alarms. At commissioning of a wheel impact detection system in Sweden, the commissioning study showed that the detection system was reliable, i.e. were not generating any false alarms. However, during operation some of the system's alarms resulted in No Fault Found (NFF) events at subsequent manual inspections performed by train d rivers to assess the severity of damages. Hence, a verification study was launched to determine if the cause of the NFF events were false alarms generated by the detection system, or the inability of subsequent manual inspection to replicate the detection system's test result. The verification study was expected to support an exclusion of the manual inspection, which was perceived to be the cause of the NFF events. However, an exclusion of the manual inspection would require the wheel impact detection system to be highly reliable, since it would be the sole support for decisions about appropriate operation and maintenance actions at an alarm. This study presents experiences from the verification study and links these to international experiences illustrating how wheel impact detection systems can support continuous assessment of wheel condition and related condition-based maintenance efforts. The experiences highlight the importance of data accuracy and appropriate information management, to achieve the potential benefits and avoid drawbacks of condition monitoring.
- Subjects
SWEDEN; FAULT location (Engineering); SYSTEM failures; RAILROAD car wheels; MONITORING of machinery; RAILROAD car maintenance &; repair; RAILROADS
- Publication
International Journal of COMADEM, 2009, Vol 12, Issue 2, p46
- ISSN
1363-7681
- Publication type
Article