Abstract
Due to the manufacturing error and wheelset wear, vehicle wheelset produces diameter difference gradually in the process of operation. It will lead to cyclical changes in creepforce, causing severe self-excited torsional vibration. The wheelset longitudinal vibration and the wheel/rail sticky-slippery vibration coupled with each other, causing the destruction of the locomotive stable dynamics performance. Establish a new type of heavy-haul locomotive model. Through numerical simulation, analysis in different diameter difference and speed calculate the principle of the variation of sticking coefficient. The conclusion shows that along with the gradual increase of diameter difference, the saturated wheel/rail creepforce saturation produce dynamic coupling, causing the wheelset wear ratio increases rapidly. The wheel diameter difference increases further and deteriorate the performance of dynamic behaviors, which will deteriorate the locomotive vertical stationarity through framework and traction device.
