In general, the rolling bearing itself does not produce noise. Usually feel "bearing noise" is in fact bearing directly or indirectly with the surrounding structures generate sound effects of vibration. This is why many noise problems can be regarded as related to the application of the entire bearing vibration problem.
The vibration behavior of the applications
In many applications, the bearing stiffness and the stiffness of the structure around the same. Due to this feature, as long as the correct choice of the bearings (including the pre-load and clearance) in the application configuration, it is possible to reduce the vibration of the application.
There are three ways to reduce vibration:
Remove from the application critical incentive vibration;
Suppressing resistance to stimulate parts and resonance between components of the critical excitation vibration;
Change the stiffness of the structure, thereby changing the critical frequency.
Excitation load changes in the number of rolling element
When a radial load is loaded on a bearing, the bearing load of the number of rolling elements in the operation will be a slight change, i.e. :2 -3-2-3 .... This causes the offset of the load direction. The resulting vibration is unavoidable, but by axially pre-loading to reduce, and loaded on all the rolling bodies (not for the cylindrical roller bearing).
Member waviness
Case the snug fit between the bearing ring and the bearing or shaft, the bearing ring may be fitted with the adjacent parts of the shape is deformed. If a deformation occurs, in operation, it may lead to vibration. Therefore, the bearing block and the drive shaft for machine processing to the required tolerances is very important.
Partial damage
Due to the operation or installation errors, a small part of the bearing raceways and rolling elements may be damaged. In operation, the rolling across the damaged bearing member will produce a particular frequency of vibration. Vibration frequency analysis can identify the damaged bearing member.


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