Dynamic Investigation of Deep Groove Ball Bearings With Localised Failure of Outer Ring Considering the Effect of Starved Lubrication

ABSTRACT The vibration response of locally defective ball bearings is closely related to their lubrication conditions. Previous bearing dynamics models mainly regarded the lubrication state as the ideal lubrication condition and failed to reveal the effect of insufficient lubricant on the vibration behaviour of defective bearings. In this paper, the interaction within the system under starvation condition was considered, and a dynamics model of defective Deep groove ball bearing (DGBB) with insufficient lubricant was established, and the accuracy of the model was verified experimentally. The results showed that the outer ring failure through frequency was modulated by the cage rotational speed, and the increase of the degree of starved lubrication significantly increased the friction, which led to the increase of cage rotational speed, and ultimately led to the increase of failure frequency. At the same time, the increase in rotational speed made the slipping phenomenon more serious, leading to an increase in the deviation rate of the failure frequency at the same starved degree. The results of the study are useful for fault diagnosis and condition monitoring of related equipment.