Abstract
In order to explore the cause of rail corrugation on the small radius curve of metro, the formation mechanism of rail corrugation is analyzed based on field measurements of line conditions and rail roughnesses and stick-slip theory, and the corresponding suggestion is put forward. The present work is a combination of experiments and numerical analysis, and the results show that the superelevation states of track structures corresponding to 8 corrugation sections are all deficient superelevations, which indicates that the deficient superelevation is directly related to the formation of corrugation. On the small radius curve of metro, both the inside and outside wheel-rail systems have a tendency of stick-slip motion, and the stick-slip vibration intensity of the inside wheel-rail system is 1.67∼2.23 times higher than that of the outside wheel-rail system, thus more likely to lead to inner rail corrugation, which is consistent with the actual situation of rail corrugation. The longitudinal stick-slip vibration plays a leading role in the evolution of corrugation, and the superelevation state of the track structure determines the formation mechanism of rail corrugation.
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Abbreviations
- h :
-
Calculated superelevation value
- h r :
-
Actual superelevation value
- v :
-
Vehicle running speed
- R :
-
Curve radius
- α 1 :
-
Longitudinal adhesion coefficient
- α 2 :
-
Transverse adhesion coefficient
- F 1 :
-
Longitudinal creep force
- F 2 :
-
Transverse creep force
- P 3 :
-
Normal force
- μ i :
-
Mean value of the adhesion coefficient
- α ij :
-
Adhesion coefficient corresponding to the moment j
- N :
-
Total number of moments
- σ i :
-
Standard deviation of the adhesion coefficient
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Zhiqiang Wang is a Ph.D. candidate in the Institute of Rail Transit, Tongji University. His research interests include wheel-rail relationship, track structure and rail corrugation.
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Wang, Z., Lei, Z. & Zhu, J. Study on the formation mechanism of rail corrugation in small radius curves of metro. J Mech Sci Technol 37, 4521–4532 (2023). https://doi.org/10.1007/s12206-023-0809-7
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DOI: https://doi.org/10.1007/s12206-023-0809-7