Abstract
Full ceramic bearing can work under a wide range of temperatures, but the thermal deformation difference between the ceramic outer ring and steel pedestal has a great increase with the rise of temperature and leads to obvious impact and friction. In this paper, the thermal deformation difference is considered and the fit clearance is taken as the boundary condition of the dynamic model. Investigations on the dynamic response of the outer ring are conducted, and the effect of thermal-related fit clearance is analyzed at different working temperatures and rotation speeds through parametric study and experiments. Results show that the vibration of the outer ring grows with the temperature and shows different changes with rotation speed as the temperature changes. The variation of working temperature brings difference in the interactions between the outer ring and the pedestal, and the trends of vibration with rotation speed also change at different temperatures. Impact and friction make great contributions to the interactions between the outer ring and the pedestal and show different changes with temperature. This study puts forward a method for the calculation of bearing vibration at variable temperatures and provides theoretical basis for the application of the full ceramic bearings.
Highlights
When the thermal deformation difference is considered in the model, the calculation results match well with the experimental results. e impact of the shaft vibration is ignored in the model, and the amplitudes of the calculation results are slightly smaller than those of the experimental results
The fit clearance is relatively small, and the boundary can be reached by the outer ring. erefore, the friction plays a dominant role in the interaction between the outer ring and the pedestal, and the impact is less obvious
When the amplitude of outer ring vibration is large enough to offset the fit clearance, the inner boundary of the pedestal acts as limitation to the vibration and the vibrations vary little with the rotation speed
Summary
Position of the inner ring relative to the outer ring. When the temperature is fixed and the thermal deformation of the pedestal can be ignored, the outer ring can be regarded as a rigid body. E dashed circle shows the inner boundary of the pedestal before deformation, and the dotdashed circle has the same diameter with the outer boundary of the outer ring. E fit clearance between the outer ring and pedestal is δ with a temperature range of ΔT. Eo is the eccentricity of the outer ring relative to the pedestal with the azimuth angle of φo and can be expressed The coordinate system {O; Y, Z} can be considered as a reference, and the outer ring moves within the boundary after deformation. eo is the eccentricity of the outer ring relative to the pedestal with the azimuth angle of φo and can be expressed
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