Vibration is the result of periodic and random positional shifts caused by kinematic errors. Bearing motion error factors lead to dynamic vibration of the bearing parts in motion, but also need to consider the role of the force associated with the motion acceleration, the bearing itself structural caused by the rigidity of the characteristics (such as the rolling body and keeper of the only change in the periodic and random, there are contact deformation caused by the change in the trace displacement) of the impact of the bearing parts in the manufacturing process of the existence of machining errors resulting in the impact of the deviation of the bearings in motion Subjected to the load, speed changes and environmental factors caused by changes in the impact of factors such as the comprehensive effect. Therefore, bearing vibration is one of the main indicators to assess the overall quality of bearings.

Bearing vibration is too large will cause the host of vibration and noise increase (mechanical vibration propagation in the air that is manifested as noise), which directly affects the host of related performance (such as some bearing vibration test is based on the relevant standard requirements in the specified measurement specifications, there are vibration (speed) and vibration (acceleration) of the two physical quantities.