Analysis of the oscillation and noise of ball bearings

Source: Bearing network time: 2012-12-30

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Questions about the oscillation and noise of ball bearings:
The oscillation of the ball bearing is caused by the touch-touch characteristics; therefore, the factors that affect the touch-touch characteristics; such as load; speed and smoothness will affect the oscillation characteristics of the bearing.
The noise of the ball bearing is the result of the bearing oscillation in the air conveyed by the human hearing system. Some domestic low-noise deep groove ball bearings have sound pressure levels of oscillation and noise and foreign low-noise bearings are appropriate; but the foreign bearing sample sound Uniform pressure level; good consistency; and domestic bearing samples have large dispersion; poor consistency, foreign samples have a low share of abnormal sound.
About the abnormal sound of the ball bearing; it is a new problem and an old problem. It is a new problem; it is because the bearing is driven from the low oscillation value to the silent direction in these years; the bearing quality is continuously improved during the process. It is an old problem; it is because there is no higher demand for the dynamic and static quality of the bearing in the initial stage of seeking low oscillation; but the abnormal sound of the bearing is objectively present; once the oscillation value of the bearing is stabilized and lowered to a certain level; The sound suddenly emerged.
China's early bearing oscillation measuring instrument can only detect the useful value of the oscillation; in the products that have passed the test; the user still thinks that some bearings have abnormal sound. This is because the measured useful value of the oscillation and the abnormal sound are not close. Correlation. The useful value of bearing oscillation is not sensitive to the oscillating pulse value; it only reflects the average level of bearing oscillation; it can not be used to determine whether the bearing has abnormal sound; but the peak limit of the oscillating acceleration level peak skill demand rule The value can be used to identify the oscillation (noise) level of the bearing. The abnormal sound test of the bearing can have a certain standard effect; therefore, it has good rationality and practicability.
There are some kinds of low-noise bearings with large oscillations; large oscillation values â€‹â€‹and abnormal sounds; their oscillation peaks are arranged from low to high: low-noise bearings; bearings with abnormal sound; large oscillation values Bearing. This shows that the peak of the oscillating acceleration level of the anomalous acoustic bearing is between the low noise and the bearing with large oscillation value. Therefore, the false positive rate of the abnormal sound of the bearing is evaluated by the useful value of the oscillation.

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