Dynamic modeling for local defect displacement excitation in rolling bearing systems under elasto-hydrodynamic lubrication and slip

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (5) : 56-64.

YAN Chang-feng KANG Jian-xiong YUAN Hao WU Li-xiao WEI Yao-bing

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Abstract

The dynamic model of a rolling bearing can be used to analyze dynamic response characteristics of its local defect. During dynamic modeling of local defects in rolling bearing systems, bearing sliding, bearing elasto-hydrodynamic lubrication and bearing pedestal may not be considered. Here, a 2-DOF dynamic model for local defect displacement excitation in a rolling element bearing system was established under elasto-hydrodynamic lubrication and slip. Firstly, contact stiffness between rolling body and bearing race, lubricating oil film stiffness and damping, bearing pedestal stiffness and damping were calculated to obtain the total contact stiffness and damping. Then the actual running state of a rolling bearing was simulated considering rolling element slipping. According to Newton motion laws, dynamic equations of a bearing with local defect were built. The fourth-order Runge-Kutta method was used to solve these equations, dynamic responses of the bearing’s local defect were obtained. Comparing test results of a faulty bearing with the above simulated ones, the correctness of the established model was verified.

Key words

elasto-hydrodynamic lubrication / slipping / rolling bearing system / local defect / dynamic modeling

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YAN Chang-feng KANG Jian-xiong YUAN Hao WU Li-xiao WEI Yao-bing. Dynamic modeling for local defect displacement excitation in rolling bearing systems under elasto-hydrodynamic lubrication and slip[J]. Journal of Vibration and Shock, 2018, 37(5): 56-64

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