Influence of Track Ramp on Adhesion Characteristic of Wheel/Rail under Third Medium Conditions

A testing fixture is designed to simulate different track gradient contacts of wheel/rail, and the effects of track ramp on adhesion behaviors under third medium conditions were explored in detail using JD-1wheel/rail simulation apparatus. The results indicate that, compared with the level track, the adhesion coefficient of wheel/rail of ramp track had a significant fall under dry, water or antifreeze medium conditions. Furthermore, the adhesion coefficient showed a downward trend with the increasing track gradient and the adhesion coefficient of decent track loss more than that of ascent track. Compared with the water, lower adhesion phenomenon appeared easily due to the spilled antifreeze fluid. Moreover, with the increasing speed and load, the adhesion coefficient of wheel/rail rollers presented a slightly downward trend.