Bearing exciting for many reasons, mainly for the following checks.
Excitation due to changes in the number of loaded rolling body
When a radial load is loaded on a bearing, load bearing rolling elements in the operation of a slight change: This gives rise to the offset of the load direction. The resulting vibration is inevitable, but can be pre-loaded by axial to reduce the load on all of the rolling element (does not apply to cylindrical roller bearings).
Waviness of the member
In the case of a snug fit between the bearing ring and the bearing or shaft, the bearing ring cooperates with the adjacent parts of the shape may be deformed. If there is a deformation in the operation may produce vibration. Accordingly, the bearing housing and the shaft is machined to the required tolerances is very important.
Local damage
Due to the operation or installation error, a small portion of the bearing raceways and rolling elements may be damaged. In operation, the rolled over the damaged bearing member will generate a lot of vibration frequency. The vibration frequency analysis can identify the damaged bearing member.
The vibration behavior of the applications
In many applications, the same bearing stiffness and the stiffness of the surrounding structure. Due to this feature, as long as the correct choice of bearings (including preload and clearance) and its configuration in the application, it is possible to reduce the vibration in the application.
There are three ways to reduce the vibration of the bearing
From the application to remove the critical excitation vibration; excitation components and resonance between components critical excitation vibration suppression resistance; changing the stiffness of the structure, thus changing the critical frequency.



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