What is Bearing Noise?

In the process of bearing operation, the vibration of bearing parts and mutual collision produce sound waves that are perceived by human hearing organs and spread by the air medium, which is rolling bearing noise.

The human ear can perceive the sound frequency range of 20Hz ~ 20kHz. more than 20kHz sound waves called ultrasound, less than 20Hz sound waves called infrasound. Both ultrasonic and infrasonic waves are inaudible to the human ear, so the frequency range for measuring and controlling bearing noise is 20Hz~20kHz.

How many types of bearing noise are there?

According to the reasons, rolling bearing noise is generally divided into:

The inherent noise of the bearing - the noise issued by the bearing itself when running, such as the sound of the raceway, etc;

Noise related to bearing manufacturing errors - due to bearing parts manufacturing errors, cage impact, excessive radial clearance and other reasons generated by noise, such as ripple degree caused by high frequency vibration sound.

With bearing improper use of the noise - due to improper use of bearings, resulting in the work surface indentation, rust and dust and other impurities particles invasion of noise.

In addition, the bearing is installed to some machinery, due to the characteristics of the elastomer, will also stimulate the corresponding noise.

What are the physical quantities and parameters for evaluating bearing noise?

The physical quantities of the evaluation of bearing noise can be characterized by sound pressure, sound intensity, sound power and sound, the units are N / m, W / mW and sone. as the same as vibration, in order to facilitate the expression, commonly used sound pressure level, sound intensity level, sound power level and sound level to characterize, sound pressure level, sound intensity level, sound power level units are dB, sound level units for phon. bearing noise is generally used to assess the sound pressure level. The sound pressure level is generally used to assess the bearing noise.

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