Study on the Effect of the Modeling Method of Railway Fastener on Rail Corrugation Prediction Model

Abstract

Taking the typical corrugation phenomenon on a curved track in a metro line as the research object, the modeling method of railway fastener in the friction self-excited vibration model of a wheel–rail system is studied in this article. Firstly, according to the difference of the track support structure in the actual metro line, finite element models of the leading wheel–track system under different track forms, including the short sleeper with a DTVI2 fastener, the shock-absorbing track with a Cologne egg damping fastener, and the ladder sleeper track with a DTIII2 fastener, were established. The rail corrugation on a curved track with a small radius with three different sleepers is studied through complex eigenvalue analysis. In addition, the difference in rail corrugation finite element prediction model with a spring–damper pair model, solid-connected model, and solid-connectmodel is studied. The stability and vibration characteristics of a wheel–rail system with different tracks are studied by complex eigenvalue analysis. The research shows that the frictional self-excited vibration of a wheelset–track system occurs under saturated creep force, and the deformation caused by unstable vibration mainly occurs in the low rail and inner wheel, which can explain why the rail corrugation of a curved track with a small radius mainly occurs in the low rail. Compared with the spring–damper pair fastener model, the calculation result using the solid element fastener model (the solid-connected model and the solid-contact model) is closer to the measured data of the rail corrugation of the curved line with a small radius on the site. Of the two solid element fastener models, the latter is significantly more accurate than the former in predicting rail corrugation on the metro lines.

Keywords:

• Rail corrugation
• friction-induced self-excited vibration
• fastener modeling method
• prediction model

Additional information

Funding

The authors are grateful for financial support from the National Natural Science Foundation of China (No. 51775461 and 52175189).