Analysis of braking stability and wheel wear of train under different track conditions and different grinders

This paper investigates the impact of wheel-rail adhesion conditions and grinder action on the stability of train braking systems and wheel wear, focusing on the phenomenon of low-speed flutter during braking. A three-body wheel-rail creep model is constructed based on the three-body contact theory, followed by the establishment of a three-body four-degree-of-freedom dynamic model of the braking system, which includes the brake block, brake disc, and wheelset. Using numerical methods, the study explores the relationship between the stability of the train brake system and wheel wear. The findings indicate that friction chatter primarily occurs during low-speed braking. While optimal wheel-rail adhesion conditions can enhance braking efficiency, they also tend to exacerbate friction chatter within the braking system. Moreover, brake system flutter induces fluctuations in wheel creepage, influencing the tangential force between the wheel and rail as well as wheel-rail wear. Although the vibration frequency of creepage remains consistent across different track conditions, the amplitude of fluctuation notably increases under low adhesion wheel-rail conditions, resulting in heightened non-uniformity of wheel wear.