Study On Stick-Slip Oscillations As A Formation Mechanism Of Rail Corrugation On Metro Lines And Parameter Analysis

Abstract

The objective of the current study is to investigate the formation mechanism of rail corrugation. According to the actual wheel-rail motion relationship, that is, considering the influence of the angle of attack (AoA), a single degree of freedom friction pair model considering different friction attributes was established. The system stick-slip oscillation characteristics under different friction attributes were analyzed by using the model, so as to explore the generation reason of corrugation. Meantime, combined with the parameter analysis of the power system, the corresponding control measures for the stick-slip oscillation were put forward to slow down the formation and development of corrugation. The results show that the lateral and vertical dynamics play important role on its stick-slip oscillation characteristics. The corrugation formation on the metro small radius curve is related to the unstable stick-slip oscillation induced by the negative slope friction creep property of wheel-rail interface. The parameter analysis illustrates that the unstable stick-slip oscillation can be effectively controlled by increasing the damping coefficient, increasing the modal stiffness, appropriately reducing the static vertical force of the contact interface and increasing the lateral velocity (AoA) within a certain range. Practically, knowing the formation mechanism of rail corrugation is conducive to understanding the evolution process of rail corrugation; meantime, by referring to the results of parameter analysis, the active control of stick-slip oscillations can be realized, thereby controlling the growth of rail corrugation.