Dynamic stability analysis on the cage of ball bearing under varying working environment

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (18) : 172-180.

YAO Tingqiang, WANG Lihua , Liu Xiaobao , HUANG Yayu

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Abstract

The dynamic characteristics of rolling bearings in rotating machinery under varying working environment are complex, to which failures and damages are susceptible.Considering the effects of clearance, impact and lubrication on the multibody dynamic contact, the multibody dynamics characteristics of ball bearings under varying working conditions were discussed.A three-dimensional contact dynamics model was established based on the geometric structural equations of ring races, and the searching algorithm for prediction of dynamic contact force was designed.A three-dimensional dynamic model of balls together with the cage was also established with consideration of the clearance, impact and lubrication and the relative action between the cage and guide ring was assumed to be equivalent to a short sliding bearing.Then the multibody contact dynamics model of angular contact ball bearings was constructed and solved by using generalized-α algorithms under varying working conditions.The three-dimensional motion trajectories, dynamic forces, vibration accelerations and FFT spectrums of ball bearings were achieved.In the starting stage, the forces and vibration displacements are larger because of the initial speed and load impact, when the inner and outer rings are both in rotating condition.In the stationary stage, the key vibration frequencies are the angular frequencies of the freely rotating rings.The displacement of cages center is deceasing only when the radial force on the inner ring keeps constant.The three-dimensional motion trajectories of cages center are approximately the whirling motion of an cylindrical surface.

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contact dynamics / varying working environment / cage / rolling bearing / multibody dynamics

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YAO Tingqiang, WANG Lihua,Liu Xiaobao,HUANG Yayu. Dynamic stability analysis on the cage of ball bearing under varying working environment[J]. Journal of Vibration and Shock, 2016, 35(18): 172-180

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