The production of vibration in bearings generally speaking, rolling bearings themselves do not produce noise. The commonly felt "bearing noise" is actually the sound effect of the vibration of the bearing directly or indirectly with the surrounding structure. This is why many times the noise problem can be regarded as a vibration problem involving the whole bearing application.
(1) Excitation caused by the change of the number of loaded rolling bodies: When a radial load is loaded on a bearing, the number of rolling bodies bearing the load will change slightly in operation, which causes the shift of load direction.
(2) Local damage: due to operation or installation errors, a small part of the bearing raceway and rolling body may be damaged. In operation, rolling over a damaged bearing component produces a specific vibration frequency. Vibration frequency analysis can identify damaged bearing components
3) the accuracy of the relevant parts: in the case of close coordination between the bearing ring and the bearing seat or the drive shaft, the bearing ring may be deformed in accordance with the appearance of the adjacent parts. If deformation occurs, vibration may occur during operation.
(4) Pollutants: if operating in a polluted environment, impurities may enter the bearing and be rolled by the rolling body. The amount of vibration produced depends on the number, size and composition of the particles being crushed. Although it does not produce a typical frequency pattern, a disturbing noise can be heard.
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