Product knowledge

Bearing vibration damage

Source:NETAuthor:UN Addtime:2022-05-06 Click:
Vibration generation in bearings Generally speaking, rolling bearings do not produce noise per se. What is commonly perceived as "bearing noise" is in fact the acoustic effect of the bearing vibrating directly or indirectly with the surrounding structure. This is why many times noise problems can be considered as a vibration problem involving the entire bearing application.
(1) the excitation due to changes in the number of loaded rolling elements: when a radial load is loaded on a bearing, the number of rolling elements carrying the load will change slightly in operation, which causes a shift in the direction of the load. The resulting vibration is unavoidable, but can be mitigated by axial preloading, loaded on all rolling elements (not applicable to cylindrical roller bearings).
(2) Local damage: Due to operation or installation errors, a small part of the bearing raceway and rolling element may be damaged. In operation, rolling over the damaged bearing parts will generate a specific vibration frequency. Vibration frequency analysis can identify the damaged bearing components. This principle has been used in condition monitoring equipment to detect bearing damage. To calculate the bearing frequency, please refer to the calculation program "Bearing frequency".
(3) The accuracy of the relevant parts: In the case of a close fit between the bearing ring and the housing or drive shaft, the bearing ring may be deformed by the shape of the adjacent parts. If there is deformation, it may produce vibration in operation.
(4) Pollutants: If operating in a polluted environment, impurities may enter the bearing and be crushed by the rolling body. The degree of vibration generated depends on the number, size and composition of the crushed impurity particles Although it will not produce the typical frequency form, but can be heard a nuisance noise.

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