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. )e results highlight that the
proposed fault dynamic model is in good agreement with the experimental results. )e model can simulate the fault signal
characteristic parameters with the change of defect width, external load, and rotating speed effectively. )e study in this paper is of
engineering application value for bearing condition monitoring and fault diagnosis.
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