The Relationship Between Bearing Vibration and Noise

Time：2021.05.20  Source：Roller Bearings Suppliers

What is bearing noise?

Bearing noise is a problem often encountered in the process of manufacturing, testing and use of a motor. It is a very unscientific approach to simply talk about the problem of bearing. The problem should be analyzed and solved in accordance with the principle of correlation and from the perspective of coordination.

Rolling bearings themselves usually do not produce noise. What is considered to be "bearing noise" is actually the sound emitted when the structure around the bearing vibrates directly or indirectly. Therefore the noise problem should usually be considered and solved in terms of the vibration problem involving the entire bearing application. Vibration and noise are often accompanied by a pair of things, the source of noise can be attributed to vibration, so to solve the problem of noise should start from reducing vibration.

Bearing vibration can basically be attributed to the excitation of rolling element number change, matching accuracy, local damage and pollution and other factors during load. The influence of these factors should be reduced as far as possible through the reasonable configuration of bearings. Need WSBC 22224 E, Click here to learn more.

Exciting force factors caused by changes in the number of load rollers

The effect on the bearing radial load, the load of the rolling element in the process of turning number will change slightly, so lead to bearing has a slight displacement along the direction of the load, thus vibrations are unavoidable, but can pass on all roller axial pre-tightening force to reduce the vibration (not applicable to cylindrical roller bearing).

With the precision factor of the components

If there is an interference fit between the bearing ring and the bearing seat or shaft, the bearing ring may deform according to the shape of the connecting parts. If there is a deviation in shape between the two, it may cause vibration during operation. Therefore, the journal and seat holes must be machined to the required tolerances.

Local damage factor

Bearing due to improper handling or improper installation may cause local damage to the raceway and rolling body. When the damaged bearing parts have rolling contact with other parts, the bearing will produce a special vibration frequency. By analyzing these vibration frequencies, it can be determined which bearing component is damaged, such as the inner ring, outer ring or rolling body, etc.

Pollution factors

Bearings work in polluted conditions and easily allow impurities and particles to enter. When these pollution particles are crushed by the rolling body, they vibrate. Different components of the impurity, the number and size of the particles cause different levels of vibration, and there is no fixed pattern of frequency. But it can also produce disturbing noise. Click here to learn more about WSBC 22222-E1-K.

Influence of bearing on vibration characteristics

In many applications, the rigidity of bearings is roughly the same as that of the surrounding structure. Therefore, the vibration of the entire equipment can be reduced through the selection of appropriate bearings (including preloading and clearance) and configuration mode. The methods to reduce vibration are:

（1）Reduce the excitation force causing vibration in the application

（2）Increase the damping of the component causing vibration to reduce resonance

（3） change the rigidity of the structure to change the critical frequency.

Where can I find high-quality bearings?

Wuxi Spark Bearing Co., Ltd (Aka Spark Bearings) is the complete, one-stop-all kind of bearing supplier & manufacturer. All products are qualified and have passed the ISO 9001 qualification. Here are some popular types of Bearings, Send a quote and get the latest price of cheap bearings from Spark Bearings.