(2) local damage: due to operation or installation errors, a small part of the bearing raceway and roller may be damaged.In operation, rolling over a damaged bearing component will produce a specific vibration frequency.Damaged bearing parts can be identified by vibration frequency analysis.This principle has been used in condition monitoring equipment to detect bearing damage.To calculate the bearing frequency, see the calculation program “Bearing frequency”.

(3) the accuracy of related components: in the case of close match between the bearing ring and the bearing seat or the drive shaft, the bearing ring may be deformed with the shape of the adjacent components.If deformation occurs, vibration may occur during operation.

(4) Contaminants: if it is run in a polluted environment, impurities may enter the bearing and be crushed by the rolling body.The degree of vibration produced depends on the number, size, and composition of the crushed impurity particles. Although it does not produce the typical frequency pattern, a disturbing noise can be heard.

The reasons for the noise of rolling bearings are more complex. One of them is the wear of the inner and outer rings of bearings.Because of this wear and tear, the bearing and the shell, bearing and shaft coordination relationship is destroyed, resulting in the axis deviation from the correct position, in the shaft at high speed movement produces abnormal sound.When the bearing is tired, its surface metal spalling, will also make the radial clearance of the bearing increase and produce abnormal sound.In addition, insufficient bearing lubrication, the formation of dry friction, and bearing breakage will produce abnormal sound.Bearing wear loose, cage loose damage, will also produce abnormal sound.