Development Trend of Research on Vibration and Noise of Rolling Bearings

1. Noise measurement and measurement standards
It is mainly to develop a portable noise measuring instrument to realize the on-site measurement and analysis of noise. Resolution of the problem
It is the basic condition for mass-producing low-noise bearings. Japan has reported measurement standards for bearing noise.
Although portable noise measuring instruments have been developed abroad, in addition to being inconvenient to use, the most important issue is still
There are two major difficulties in developing this kind of noise measuring instrument: the isolation effect of background noise and the noise time domain
Number of pick errors. The angle and distance of the microphone relative to the measuring bearing must be considered in the measurement standard.
2. Research on Uncertainty of Bearing Noise Sound Pressure Level
In the measurement of bearing noise, the evaluation of measurement uncertainty is an important issue. A small sample must be studied.
Measure the expansion uncertainty of bearing sound pressure level to evaluate the expansion of each bearing sound pressure level
Uncertainty and prediction of the range of sound pressure levels for mass-produced low-noise bearings.
Research on bearing noise uncertainty will depend on fuzzy set theory, grey system theory, and maximum entropy principle
Or Bayesian theory, etc., the difficulty lies in the small measurement data and unknown probability density function.
3. Research on noise mechanism and noise diagnosis theory
It is necessary to break through the status quo of bearing vibration research, attracting frictional vibration and acoustics, shock vibration and acoustics, and non-
Linear dynamics and other theories focus on the order and randomness of uncertain information. FT spectrum
Those harmonic components of seemingly random errors cannot be doubted as the performance of non-linear factors.
The mass (weight) of the rolling elements is a factor that cannot be avoided in the study of noise mechanism and noise diagnosis theory. roll
The non-linear contact deformation of the moving body and the raceway of the ferrule inevitably causes the non-linear vibration of the rolling body. Transport of the cage
The interactions between motion, pocket clearance, and rolling body motion (collision, friction, etc.) are noise mechanisms and noise
Difficulties in the study of acoustic diagnostic theory. Many non-quantified and fuzzy factors (e.g., cleaning, grease, etc.)
Quantitative description of acoustic contribution remains a unified barrier to noise theory and noise practice.

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