To explain the formation mechanics of corrugation in the case of sharp curves, a mathematical model was developed and full scale experiment on test stand and on commercial line were carried out. The simulation results and the measured results agree well with each other. The corrugations are thought to be formatted by the following mechanism: In the case of sharp curve, the length difference between inside and outside can not be absorbed by the difference of wheel rolling radius. In this condition, the axle is forced to torture by the longitudinal creep force between rail and wheel. If the wheelset vibration in vertical direction is induced by any irregularity between wheel and rail, wheel load fluctuation will appear and the saturation value of creep force may change. Stick-slip oscillation between wheel and rail will happen with the vibration of axle torsion. Periodical wear by stick-slip oscillation together with axle torsional vibration may lead to the formation of corrugation. Usually, as the wheel load of inside is smaller, stick-slip at inside is easier to happen. This may cause corrugation on the inside rail. The frequency of corrugation, that is the frequency of stick-slip, approximately equals to the natural frequency of vertical system including Hertzian contact stiffness but not to the natural frequency of axle torsion. It is found that to reduce the insufficiency of wheel rolling radius difference is the most effective method to prevent the formation of corrugation.
Study on the formation mechanism of rail corrugation on curved track
Untersuchung des Entstehungsmechanismus von Wellen auf Eisenbahnschienen in Bahnstreckenkurven
1996
16 Seiten, 11 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
Study on the Formation Mechanism of Rail Corrugation on Curved Track
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