Abstract
To comprehensively study the mechanism of rail corrugation, a friction coupling model of a wheelset–rail system based on friction-driven self-excited vibration (FSV) theory was established. Complex eigenvalue analysis was used to study the effects of factors such as the number of wheelsets, longitudinal position of the leading wheelset, and mesh size on the calculation accuracy of the model, and a simplified and unified finite element modeling standard was proposed. Furthermore, based on the established unified criterion, the rail corrugation arising on sharp curve tracks in five common types of subway track systems was studied, and the effect of the friction coefficient on the FSV of the wheelset–rail system was investigated. When the friction coefficient changes, the frequency variation of the unstable vibration generated by the wheelset–rail system is small. Consistently, the tendency for unstable vibration to occur in these five types of wheelset–rail system was enhanced with an increase in the friction coefficient. The friction coupling model of the wheelset–rail system, which is established based on the FSV theory and using the simplified and unified modeling standards proposed in this paper, can quickly and accurately predict rail corrugation, and it exhibits strong robustness in predicting rail corrugation.
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