Dynamic asymptotic model of rolling bearings with a single fault in the inner raceway

Abstract

In the previous models of rolling bearings with a single fault, the displacement deviation caused by the collision of the fault to the rolling element changes instantly. However, the displacement deviation should change gradually. Here, the asymptotic idea is introduced to describe the change of the displacement deviation. The calculation method of the deviation is given. An asymptotic model of rolling bearings with an inner raceway fault is constructed. Then, the simulation of the SKF6205 bearing with a single fault is carried out. The differences between the previous model and the asymptotic model for the responses and the displacement deviation are compared. The effects of the speed and fault size on the dynamic characteristics are analyzed. Finally, the experiments are carried out to corroborate the rationality of the constructed model. The research results can provide theoretical support for the dynamic analysis, fault diagnosis, and reliability analysis of rolling bearings.

Comparison of non-linear vibration of outer race defective ball bearing using two defect functions

“…In the last two decades, many researchers [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] developed NDMMs for bearing systems that involve singlerow DGBBs having an individual localized defect or compound defects on one of the bearings. These ball bearing systems are modeled by using 2-DOF models and by assuming that the rotating bearing elements have only two-directional (planar) motions.…”

“…Cheng et al 27 modeled a SKF 6205 DGBB with individual localized ORD, IRD and BD. Li et al 28 proposed an asymptotic defect model for a SKF 6205 DGBB to study the effects of a localized IRD considering the asymptotic change of ball displacement. They also compared the results of the transient model and asymptotic model at different speeds and IRD sizes.…”