Dynamic response and failure analysis of bearing under the impact of vibration excitation

Abstract

The dynamic response of bearings under vibration excitation environment is an important theoretical basis for studying the occurrence and extension analysis of abnormal bearing failures in engineering, the influence of vibration excitation environment on acceleration, displacement and stiffness signal data under different bearing conditions and working conditions is analyzed in this paper. Firstly, a vertical bearing test bench, which can simulate and withstand vibration excitation environment is built, and the measured vibration signals of the tested bearing are analyzed to obtain the changes of bearing dynamic parameters (acceleration, orbit of bearing center and stiffness) under different working conditions. Secondly, these parameters variation of the normal bearing and the bearing with outer raceway fault under the presence/absence of vibration excitation environment are compared respectively. Finally, the influence of the vibration excitation on bearing failure mechanism is analyzed. The results show that the vibration excitation can significantly increase the acceleration and axis trajectory of the bearing, and the maximum can be increased by 7 times. and the stiffness of the bearing is significantly reduced, and the maximum can be reduced by 60 %, which accelerates the degradation rate of the bearing raceway surface and may lead to early failure of the bearing. The results of this paper can provide data support for the abnormal failure analysis of bearings under periodic excitation environment in practical engineering.