Abstract
To further study the fault mechanism and fault features of rolling bearings, a two-DOF rolling bearing fault dynamic model with inner ring local defects considering the bearing radial clearance and time-varying displacement excitation is established based on Hertz contact theory. By comparing the simulated fault signal with bearing fault test data in the time domain and frequency domain, the accuracy of the established fault dynamic model is verified. Finally, the change rules of the characteristic parameters of the bearing inner ring fault signal, including effective value, absolute mean value, square root amplitude, peak value, kurtosis factor, pulse factor, peak factor, and shape factor, are simulated by the fault dynamic model. The results highlight that the proposed fault dynamic model is in good agreement with the experimental results. The model can simulate the fault signal characteristic parameters with the change of defect width, external load, and rotating speed effectively. The study in this paper is of engineering application value for bearing condition monitoring and fault diagnosis.
Highlights
Rolling bearing is an important part of various rotating machines
It is of great significance to establish a reliable rolling bearing fault dynamic model for studying bearing condition monitoring and fault diagnosis [2, 3]
Patil et al [4] established a dynamic model of rolling bearing based on Hertz contact theory and simulated the influence of the bearing outer ring local defect on bearing vibration
Summary
Rolling bearing is an important part of various rotating machines. Bearing failures affect the normal operation of mechanical equipment and cause catastrophic damages [1]. e condition monitoring and fault diagnosis for rolling bearings are hot topics of current research. Zhang et al [6] built a two-DOF rolling bearing fault dynamic model with outer ring local defects, which considered the rolling shaft nonlinear bearing force and radial clearance. Guan et al [7] set up three nonlinear dynamic fault models of rolling bearings with outer ring local defect, inner ring local defect, and the roller local defect, respectively, considering the bearing radial clearance, the nonlinear contact force of the roller and the raceway, and the varying compliance (VC) vibration. Ey studied the effect of displacement excitation form and local defect size on the vibration characteristic of cylindrical roller bearing It offered valuable conclusions for the incipient local defect fault dynamic analysis and fault diagnosis of rolling bearing. When the inner ring fault occurs, the model is used to simulate the influence of the defect width, the external load, and the working speed on the bearing fault characteristic parameters. e research results can provide a theoretical reference for bearing condition monitoring and fault diagnosis
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