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High quality Zhou Cheng (Zhou Cheng) at the beginning when in use, the vibration and noise are relatively small, but some scattered spectrum, amplitude is small, may be due to some defects in the manufacturing process, such as surface burrs caused by.
The campaign for a period of time, to maintain a certain level of vibration and noise, frequency spectrum is very single, only appeared one or two times. Rarely appears three times above the frequency spectrum, bearing condition is stable, entered the period of stable work.
Continue to run into the use of late, EDA bearing vibration and noise began to increase, and sometimes appear abnormal sound, but the change of vibration increases more slowly, at this time, bearing kurtosis value suddenly reaches a certain value. We think, the bearing that is early failure.

At this time, requires close monitoring of the EDA bearings, pay close attention to the change. Since then, bearing kurtosis value began to decline rapidly, and close to the normal value, while the vibration and noise significantly increased, the increase amplitude begins to accelerate, when vibration more than vibration standards (such as ISO2372), the bearing kurtosis value began to increase quickly, when both exceeding standard of vibration, and kurtosis value more than the normal value (available kurtosis relative standard), we believe that the bearing has entered late failure, the need for timely maintenance equipment, replacement of bearings.
Bearing showed advanced fault feature to appear serious faults (usually bearing damage such as axle, burn, sand frame spallation, raceway, beads to wear) most of the time not more than one week, equipment capacity is more big, the faster the speed, the shorter the time interval between. Therefore, in the actual fault diagnosis of bearing fault feature, once found late, should be decisive judgment bearing fault, arrange the repair as soon as possible.
The size and quality of a rolling sound, bearing the sound of the operation of the bearings rolling sound check, bearing even a slight separation of the injury, also issued abnormal sound and irregular sound, with sound measuring device can distinguish.
Vibration and bearing vibration, bearing two is sensitive to EDA bearing damage, such as peeling, indentation, rust, crack, wear will be reflected, in the measurement of bearing vibration so, through the use of special bearing vibration measuring device (frequency analyzer etc) can measure the size of the vibration, the frequency cannot be inferred the abnormal situation. The measured values, and different bearing conditions of use or the sensor installation location, therefore require prior to each machine measurement comparison criteria.
Temperature of the bearing three, bearing temperature, generally bearing outside of room temperature can be speculated that, if the uses of oil hole can directly measure the temperature of the bearing outer ring, is more suitable for the. Usually, EDA bearing temperature as running slowly rising, reach a steady state after 1-2 hours.