Study on the mechanism for the wheel polygonal wear of high-speed trains in terms of the frictional self-excited vibration theory

In the paper, the frictional self-excited vibration of a wheelset-track system caused by the saturated wheel-rail creep force is proposed as a possible mechanism for wheel polygonal wear of high-speed trains. The wheelset-track system model is established, which consists of a wheelset, two rails, so...

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Bibliographic Details
Published in:Wear 2019-04, Vol.426-427, p.1820-1827
Main Authors: Zhao, X.N., Chen, G.X., Lv, J.Z., Zhang, S., Wu, B.W., Zhu, Q.
Format: Article
Language:English
Subjects:
Computer simulation
Damping
Eccentricity
Eigenvalues
Frictional self-excited vibration
High speed rail
Out-of-round wheels
Parameter sensitivity
Polygons
Railroad ties
Railroad transportation
Sensitivity analysis
Vertical stiffness and damping
Vibration
Wear mechanisms
Wheel polygonal wear
Wheelset eccentricity
Wheelsets
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Summary:In the paper, the frictional self-excited vibration of a wheelset-track system caused by the saturated wheel-rail creep force is proposed as a possible mechanism for wheel polygonal wear of high-speed trains. The wheelset-track system model is established, which consists of a wheelset, two rails, some sleepers and a slab. The stability of the wheelset-track system is studied through the complex eigenvalue method. Results show that the unstable vibration frequency of the wheelset-track system is f= 495.01 Hz, which can lead to the 18th-order wheel polygonal wear. This simulation result is approximately consistent with the field measurement result. Furthermore, the parameters sensitivity analysis shows that increasing the vertical damping of the fastener to a certain extent can suppress or eliminate wheel polygonal wear. In addition, a transient dynamic analysis of the wheelset-track system with the wheelset eccentricity is conducted. Results indicate that the wheelset eccentricity is an important factor affecting wheel polygonal wear. •The saturated creep force can cause self-excited vibration of the wheelset-track system. The dominant unstable vibration frequency from the prediction model is about 495.01Hz, which is very close to the frequency of the 18th-order wheel polygonal wear.•Increasing the damping of the fastener can effectively suppress wheel polygonal wear.•The wheelset eccentricity is an important factor affecting wheel polygonal wear.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2019.01.020