Abstract
Full-ceramic ball bearings are widely applied in wide temperature ranges due to their excellent thermal shock resistance, and the condition monitoring and fault diagnosis are mainly conducted through the spectrum analysis based on the defect frequencies. However, the outer ring has a spinning motion in the temperature-related fit clearance, which leads to the deviation of raceway defect frequencies, and is not conducive to the fault diagnosis. In this paper, the temperature-related fit clearance is considered in the dynamic model, and defects are added on the inner raceway and outer raceway. The motions of the rings are calculated and analyzed in the frequency domain, and the trends of peak frequencies with temperature are investigated. Simulation and experimental results show that the spinning speed of the outer ring increases with temperature, and the defect frequencies exhibit obvious deviation in wide temperature ranges. In a temperature range of 500 K, the defect frequencies exhibit deviations of over 3%, which is obvious in the defect frequency identification. The results provide insights on the full-ceramic ball bearing dynamics and help with the fault diagnosis and status monitoring of the relevant devices.
Highlights
Rolling bearings are fundamental elements in rotary machines, whose operation stability is significant for the whole mechanical system
In the continuous operation of ceramic bearing systems, defects such as cracks and spallings often appear on the inner and outer raceways under impacts. e ceramic bearing components have poor resistance to surface cracking and spalling as a result of the unavailability of plastic binding phases, which results in the sharp degrading in performance when defects occur. erefore, the condition monitoring and fault diagnosis for ceramic bearings are extremely important for the stable operation of related devices
Mao et al [20] proposed a model with the ring flexibility and pedestal contact force, and the results showed that the fit clearance made an impact on the system vibration by changing the load distribution
Summary
Rolling bearings are fundamental elements in rotary machines, whose operation stability is significant for the whole mechanical system. For full-ceramic ball bearings, the fit clearance between the outer ring and the pedestal changes greatly in wide temperature ranges. Mao et al [20] proposed a model with the ring flexibility and pedestal contact force, and the results showed that the fit clearance made an impact on the system vibration by changing the load distribution It has been proved in previous studies [21, 22] that the fit clearance for full-ceramic bearing had a nonlinear growth with the working temperature, and the outer ring made an orbit-spinning compound motion in the pedestal with the effect of friction torque. The impact frequency changes, as shown in equations (14)–(21), and the effect of the fit clearance can be revealed in the dynamic response of the inner ring and outer ring
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