Ball bearing noise is NSK bearing vibration in the propagation of the air by the human auditory system feel results. Of some domestic low noise deep groove ball bearing vibration and noise of a speaker and foreign low noise bearing the same level, but the foreign bearing sample pressure level even, have good consistency, and domestic bearing the big difference of sample scattered, tolerance; Foreign sample had abnormal sound of the proportion of the low.

On the ball bearing abnormal sound, is a new problem is an old problem. Say it is new problems, because it is in recent years by low bearing vibration value to mute direction, bearing the continuous improvement in the quality of the problems in the process. Say it is old problems, because in the pursuit of the initial low vibration of the sound of bearing no quality put forward higher request, but SKF bearing abnormal sound is objective existence, once bearing vibration value stable reduce to a certain level, abnormal sound will dash forward show come out.

Early in our country of bearing vibration measurement instrument for the effective value of vibration only this one parameter, was qualified products, users still think some bearing a different sound. This is because the measurement of vibration and abnormal sound no RMS closely related. The effective value of bearing vibration of vibration of the pulse value reflect not sensitive, it only reflect INA bearing vibration of the average, and not effective judgment bearing are normal voice but vibration acceleration peak level by the technical requirements of the limits to peak bearing vibration (noise) level for effective FenDang evaluation, the abnormal sound of bearing test can play a certain role of standard, so has good reasonable and practical.

For most low noise, vibration value and had abnormal sound and three kinds of different grades of bearings, their vibration according to peak from low to high order for: low noise bearings with abnormal sound of bearing, vibration value big bearings. This suggests that a abnormal sound of bearing vibration acceleration FAG peak level in low noise and vibration value between bearing. Therefore, with the vibration RMS to evaluate the vicinity of abnormal sound bearing rate is higher.

At present abnormal sound detection has two kinds of ways. One is based on acoustic method for the noise, and the other is based on the method for the vibration.

Noise inspection method, is based in less than 20 db deadened the noise of the environment, NACHI bearing use high quality microphones to a certain distance and direction extraction bearing pressure signal, and the certain analysis method of extracting this abnormal sound components, is abnormal sound of direct measurement method.

Vibration inspection method, it is abnormal sound of indirect inspection method, can divide again for qualitative and quantitative method for the method for parameters. Among them, the qualitative method for monitoring and divided into sound abnormal vibration wave observation method and method. Quantitative method for parameters is to point to be measured with vibration signal and anomalies in bearing the measured parameters about sound such as: the vibration of the peak, wave factor to evaluate the bearing abnormal sound.



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