Abstract
Analysis of dynamic characteristics of the defective bearing is significant for the fault diagnosis of the machinery. At present, there are few researches on numerical modeling of bearing with defective roller. To solve this problem, explicit finite element method is adopted in this paper to establish a nonlinear dynamic model of the cylindrical roller bearing with roller spalling defects. In the proposed model, the flexibility of all the components, the internal friction, the relative sliding, the finite size of the roller and the rollers-to-cage contact force are all considered. Then the proposed dynamic model is verified theoretically and experimentally. The vibration responses of bearing and the sliding behavior of defective roller and cage are analyzed based on the proposed numerical model. The results show that the roller-to-cage contact force will be increased and the slippage of the defective roller will be aggravated when the roller defect occurs. In addition, the increment of defect width and number of defective rollers will aggravate the vibration of bearing and the sliding of cage.
Highlights
Rolling bearings are extensively applied in rotary machine of aerospace, railway, construction, mining and other industries because of their convenient installation and reliable operation [1]
It should be noted that the roller defect frequency of the simulated and the experimental results are slightly smaller than that of the theoretical results, which is because the theoretical formulas do not consider the skidding of the defective roller
In the process of sliding, the trajectory of the node located on the edge of the defective roller overlaps the outer race, and the defect keeps rubbing with the raceway until reaches the point B, 1 3
Summary
Rolling bearings are extensively applied in rotary machine of aerospace, railway, construction, mining and other industries because of their convenient installation and reliable operation [1]. Ahmadi et al [19] constructed a vibration model of rolling bearings with defective outer race considering the size of rollers on the basis of Refs. Yang et al [25] presented a vibration model of rolling bearing-rotor-casing system and investigated the influence of localized defects on the system dynamic characteristics. [26, 33] only studied the sliding behavior of healthy bearing without considering the effects of defects on the roller sliding To overcome these problems, a nonlinear dynamic model of rolling bearing with roller defects is proposed using explicit FE analysis method in this paper. Based on the proposed model, the effect of roller defects on vibration response of the bearing and the cage skidding are investigated
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