Research on Nonlinear Vibration Characteristics of Ceramic Bearing-rotor System Considering Dynamic Waviness

doi:10.3901/JME.2024.23.189

Abstract

Abstract: During operation of ceramic bearings, long-term wear of the components leads to waviness on the surface, while the temperature rises inside the bearing causes thermal deformation of the waviness shape. Resulting dynamic changes in surface waviness can increase the vibration of the bearing-rotor system and cause system instability. To target this problem, a dynamic waviness model is proposed. And the dynamics model of the ceramic bearing-rotor system with 12 degrees of freedom is established. The Newton-Raphson and Newmark-β nested iterative solution methods are used to combine the quasi-static and dynamic models. Analyze the effects of rotational speed, thermal deformation, waviness amplitude, wave number on the nonlinear vibration of the system by using bifurcation diagrams, phase trajectories, axis orbits, and Poincaré. The results show that the increase of the waviness amplitude causes the center of the instability region to move toward the high-speed interval and expands the influence of thermal deformation. The thermal deformation enlarges the width of the instability region in the high-speed interval. The change in the wave number leads to a change in the order of magnitude in the spectrum amplitude, and the closer to an integer multiple of the number of rolling elements, the more unstable the vibration gets. This study provides a theoretical basis for further investigation of the dynamic operation mechanism and optimal design for ceramic bearings and rotor systems.

Key words: ceramic bearing, nonlinear, thermal deformation, waviness, bifurcation

CLC Number:

TG156

WANG Zhan, CHEN Siyang, WANG Zinan, ZHANG Ke. Research on Nonlinear Vibration Characteristics of Ceramic Bearing-rotor System Considering Dynamic Waviness[J]. Journal of Mechanical Engineering, 2024, 60(23): 189-204.

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