323 / 2021-04-30 15:39:09

Influence of Wheelset Defects on Vibration Performance of High Speed Railway Axle Box Bearing

vibration performance；wheelset defects；tapered roller bearing；high speed vehicle

Special Sessions > Vibration detection and fault diagnosis of rail transit rotating machinery

Axle box bearing and wheel-set axle have interference fit, and most of the excitations such as tracks and lines are indirectly transmitted to the axle box bearing through the wheelset. Therefore, the wheelset is the main source of excitation outside the axle box bearing. In this paper, a high-speed EMU is taken as the research object, and a dynamic model of the whole vehicle considering wheelset flexibility is established through Simpack. The structure force analysis of double-row tapered roller bearing is analyzed theoretically, and the bearing dynamic model is established. The reliability of the model is verified with experimental data. The influence of wheel-rail excitation and wheel flat on bearing vibration characteristics was simulated and analyzed. The bearing vibration signals under various working conditions were extracted to investigate the variation law of vibration characteristics of normal axle-box bearing under the state of wheelset defects. The results show that the wheel-rail excitation increases the impact force between the roller and the cage, especially in the radial impact between the roller and the cage. At the same time, the wheel-rail excitation also intensifies the skid of the cage. In the loading zone of the raceway, the impact load reduces the contact load of the outer ring of the roller when the wheel enters the flat area, and increases the contact load of the outer ring when the wheel leaves the flat area. In the unloading zone of the raceway, the roller and the outer ring will also produce multiple impacts. In the whole raceway area, the raceway impact load excited by flat scar is symmetrical in left-right distribution, and the closer the raceway area is to the symmetry axis, the greater the impact load is. The research results are of great significance to reveal the state detection of axle box bearing under the condition of high-speed train operation.