Probabilistic defect-based risk assessment approach for rail failures in railway infrastructure

May 20, 2016 in

Conference Paper

Ali Jamshidi

Shahrzad Faghih-Roohi, Alfredo Núñez, Robert Babuska, Bart De Schutter, Rolf Dollevoet, Zili Li


14-th IFAC Symposium on Control in Transportation Systems (ICCL’15)
Year: May 2016
Location: Istanbul, Turkey

Bayesian inference, Failure risk, railway track, Severity analysis, squat

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This paper develops a defect-based risk analysis methodology for estimating rail failure risk. The methodology relies on an evolution model addressing the severity level of rail surface defect, called squat. The risk of rail failure is assessed by analyzing squat failure probability using a probabilistic analysis of the squat cracks. For this purpose, a Bayesian inference method is employed to capture a robust model of squat failure probability when the squat becomes severe. Moreover, an experimental correlation between squat visual length and squat crack depth is obtained in order to define four severity categories. Relying on the failure probability and the severity categories of the squats, risk of future failure is categorized in three different scenarios (optimistic, average and pessimistic). To show the practicality and efficiency of the proposed methodology, a real example is illustrated.