A study on the frequency shift characteristics of rolling bearing ring fault considering the sliding effect under different lubrication conditions

Abstract

The change in lubrication status often leads to changes in the internal force and vibration status of rolling bearings, which is the reason for the change in the character frequency of rolling bearing defects. This thesis simulated the lubrication state of starved lubrication and adequate lubrication by quantifying the amount of lubricant, and explored the mechanism of characteristic frequency changes under different lubrication states through dynamic modeling techniques. The results showed that as the lubrication state changed from starved lubrication to adequate lubrication, although the friction between rolling body(RB) and the raceways decreased, it could not overcome the influence of increased lubricating oil viscosity resistance. The sliding effect inside the bearing intensified, and the frequency of outer ring(OR) and inner ring(IR) defects decreased, with change rates of 6.3% and 5.3%, respectively; This phenomenon had also been observed in experiments. The research results provide practical reference for bearing fault monitoring technology based on frequency comparison method in practice, which should consider the frequency change rate of defect characteristics caused by lubrication status in different periods for accurate diagnosis.

Keywords

• starved lubrication
• adequate lubrication
• rolling bearing
• defect
• fault diagnosis