Dynamic characteristics analysis of a wide temperature range ceramic bearing rotor system considering deflection

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 28-35.

BAI Xiaotian, YANG Wuzhe, WANG Zinan, ZHENG Hao

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Abstract

The fit clearance between the ceramic bearing outer ring and the bearing pedestal changes greatly in wide temperature ranges, and the shaft deflection caused by the rotor mass makes significant impacts on the motion of the shaft, especially when the shaft is long and slender. Then the load boundary conditions between the shaft and the bearing changes obviously, which has great influence on the bearing running performance. In this paper, a dynamic model considering the influence of deflection on the bearing rotor system in a wide temperature range is proposed, in which the thermal deformations of the pedestal and bearing are calculated separately as geometric boundary conditions. The shaft deflection is then considered to determine the contact forces between the inner ring and the shaft, and the dynamic characteristics of the ceramic bearing rotor system is thereby obtained. Parametric studies are carried out on the vibration situations of the full ceramic ball bearing considering the impacts brought by working temperature and shaft deflection, and the results are verified through experimental investigations. Results show that the shaft deflection leads to reductions in positive amplitudes of full ceramic ball bearing in wide temperature ranges, which results in unstable running of the system. The research results provide references for the dynamic analysis of full ceramic ball bearing, and also lay theoretical foundations for the improvement of the ceramic bearing rotor system stability.

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Full ceramic bearing / Dynamic model / Fit clearance / Deflection

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BAI Xiaotian, YANG Wuzhe, WANG Zinan, ZHENG Hao. Dynamic characteristics analysis of a wide temperature range ceramic bearing rotor system considering deflection[J]. Journal of Vibration and Shock, 2024, 43(1): 28-35

References

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