Influence of sliding effect on frequency of rolling element defect in ball bearing
In response to the problem that the frequency of rolling element defect caused by the sliding effect of ball bearing under elastohydrodynamic lubrication was lower than the theoretical value,which was not conducive to fault diagnosis of ball bearing.Therefore,a dynamic model of bearing considering the sliding effect of ball bearing under elastohydrodynamic lubrication was established,and the influence of sliding effect of ball bearing on the defect frequency of rolling elements was studied.Firstly,based on the theory of bearing dynamics and elastohydrodynamic lubrication,the equivalent stiffness and damping between various components in the ball bearing were analyzed.Then,based on the force relationship between bearing components,a dynamic model of bearing with rolling defect considering sliding effect was established.Finally,the sliding effect between the rolling elements and the inner ring and outer ring of the bearing under the action of elastohydrodynamic lubrication was analyzed,and the influence of the sliding effect on the defect frequency of the rolling element was obtained.The correctness of the model was verified through experiment.The research results show that due to the sliding effect of ball bearings,the frequency of rolling element defects is approximately 93.6%of the theoretical value.Increasing the load can suppress the influence of sliding effect on the frequency of rolling element defect,which is about 96.3%of the theoretical value.However,due to the constant existence of sliding effect,the frequency of rolling element defect is always lower than the theoretical value.The research results provide the reference basis for the slip suppression and fault diagnosis of ball bearings under elastohydrodynamic lubrication,and enrich the dynamic modeling theory of bearing faults.
deep groove ball bearingbearing fault diagnosisball bearing dynamic modelelastohydrodynamic lubrication theorysliding effectrolling element defect frequencyfault excitation
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