Abstract
An interesting rail corrugation phenomenon unreported in open literature is found in Beijing metros, in which the wavelength of rail corrugation in the Cologne egg sleeper section is obviously different from that in the fixed dual short sleeper section, although both sleeper sections are located on an identical sharp curved track. Based on the viewpoint that friction-induced oscillation is the main cause of rail corrugation in some cases, three multiple-wheelset-track models in the transitional section on an identical sharp curved track are built in this paper. The phenomenon is researched by adopting the complex eigenvalue method together with the transient dynamic method. The simulation results are consistent with the corrugation measured in real metros. It can be found that the unstable oscillations mainly occur on the low rail and the relevant frequencies are noticeably different in different sleeper support sections. The dominant unstable oscillation frequencies in the fixed dual short sleeper and Cologne egg sleeper sections are about 201 and 422 Hz, respectively. However, when a sharp curved track is supported only by fixed dual short sleepers or Cologne egg sleepers, the unstable oscillation frequencies are close to each other, which are both about 420 Hz. Therefore, the corresponding wavelengths of rail corrugation are different in different conditions. The local special phenomenon can be satisfactorily explained and the viewpoint of friction-induced oscillation can be further verified.
Highlights
According to the simulation results, one can find that the wavelength of the corrugation occurring on the low rail supported by the Cologne egg sleeper is quite different from that on the low rail supported by the fixed dual short sleeper in an identical sharp curved track
The present paper proposes a simulation research on the special phenomena of corrugation on the sharp curved tracks based on the opinion that friction-induced oscillation is the main cause of rail corrugation
Three multiple-wheelset-track simulation models are established using Abaqus, which include (1) one wheelset-track system in which two wheelsets are located on the track supported by the fixed dual short sleepers and two wheelsets are located on the track supported by the Cologne egg sleepers, (2) one wheelset-track system in which all four wheelsets are located on the track supported only by fixed dual short sleepers and (3) one wheelset-track system in which all wheelsets are located on the track supported only by Cologne egg sleepers
Summary
Rail corrugation is a critical issue in railway engineering and has been investigated by worldwide scholars for more than a century. A CASE STUDY OF RAIL CORRUGATION PHENOMENON BASED ON THE VIEWPOINT OF FRICTION-INDUCED OSCILLATION OF A WHEELSETTRACK SYSTEM. Clark et al [13] researched the corrugation caused by the friction-induced oscillation of flexible wheel-rail under high creepage conditions. The model based on the transient dynamic mechanism may generate corrugation under the excitation of a white-noise irregularity of the rail working surface. The predicted frequency range of corrugation using the model based on the stick-slip mechanism has a certain disparity with the actual corrugation frequency range. It appears that there is still not an effective method to prevent rails from corrugation, and rail grinding is applied to remove severe rail corrugations. To fundamentally suppress or eliminate the corrugation, it is important to understand the mechanism and build a suitable rail corrugation model
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