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What are the causes of bearing excitation and sound

Many users in the use of bearings have encountered a lot of problems in the use of bearings in the process of many problems, the general mechanical enterprise staff understand the knowledge of bearings, know how to maintain bearings, the use of bearing process precautions are clear, some novices do not understand, only know simply look at the machine running on the line, today we will introduce a bearing in the machinery will occur in the phenomenon of excitation. What is the reason for this.

1, the application of the vibration behaviour

In many applications, the stiffness of the bearing is the same as the stiffness of the surrounding structure. Due to this feature, it is possible to reduce the vibration in the application as long as the bearings (including preload and clearance) and their configuration in the application are selected correctly.

2. Waviness of bearing components

In the case of a close fit between the bearing ring and the housing or drive shaft, it is possible for the bearing ring to deform in line with the profile of the adjacent components. If deformation occurs, vibration may occur during operation. It is therefore important that the bearing housing and drive shaft are machined to the required tolerances.

3. 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, i.e. this 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).

4、 Local damage

Due to operational or mounting errors, small parts of the bearing raceways and rolling elements may be damaged. In operation, rolling over damaged bearing components will generate a specific vibration frequency. Vibration frequency analysis identifies the damaged bearing components.

Small ways of addressing bearing vibrations:

There are three ways to reduce vibration:

1. removing critical excitation vibrations from the application;

2. suppressing critical excitation vibrations between the excited and resonant components;

3. Change the stiffness of the structure, thus changing the critical frequency.

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