Nonlinear vibration and slippage characteristics analysis of full-ceramic bearings with dynamic surface waviness

Abstract

To examine the impact of surface waviness on nonlinear vibration and slippage characteristics of the full-ceramic bearing (FCB), thermal deformation and displacement excitation are coupled to propose the dynamic surface waviness model. The time-varying displacement excitation (TVDE) and the Hertz contact theory are combined to obtain the calculation method of the time-varying contact stiffness coefficient (TVCSC). The slipping dynamic model of FCBs is established. We examine how the slippage and nonlinear vibration properties of FCBs are affected by thermal deformation, rotating speed, and waviness. The findings indicate that the rise in rotational speed, waviness amplitude and wave number all cause the increased ball-raceway contact stiffness coefficient. The rise in the amplitude of waviness as well as wave number can have the effect of inhibiting slippage. However, they can be too large resulting in an abnormal inner ring vibration. The increase in rotational speed can exacerbate slippage. Meanwhile the thermal deformation also has the effect of inhibiting slippage. The maximum fundamental frequency error between simulation and experiment is 0.37 %. This research can benefit the optimal design of FCBs structures.