The classic bearing fault development and stage

A change, the process of bearing fault bearing fault development law is not according to the linear degradation, but according to the index law changes, as shown in the figure below: 2, bearing fault development phase 1, the initial stage of low noise is normal; Low temperature is normal; To use ultrasonic vibration peak energy, acoustic emission measurement, a defect bearing outer ring; Total quantity is small, low vibration without discrete bearing failure frequency peak; Low residual life is more than 10%. 2, the second stage low noise slightly increased; Low temperature is normal; Ultrasonic, acoustic emission, vibration peak energy have large increase, a defect bearing outer ring; Low vibration amount increased slightly ( The total vibration acceleration and vibration velocity) ； Low spectrum of a logarithmic scale can clearly see the bearing fault frequency, linear scale spectrum. It's rare to see, on the horizontal noise increased significantly; Low residual life 5%. 3, the third stage low noise can be heard; Low temperature slightly higher; Very high ultrasonic, acoustic emission, vibration peak energy, bearing outer ring fault; Low total vibration acceleration and vibration velocity has a big increase; Low on the spectrum of the linear calibration clear bearing failure frequency and its harmonics and sideband; Low vibration spectrum noise obviously improve the horizon; Low residual life is less than 1%. 4, the fourth stage of low noise intensity change; Low temperature increased significantly; Ultrasonic, acoustic emission, vibration peak energy increases rapidly, then gradually decreases, and the bearing outer ring is in fault state before damage; Low amount of vibration velocity and vibration displacement quantity increased obviously, the total vibration acceleration decreased; Low low vibration peak of the dominance of bearing failure frequency, vibration noise in the buccal spectrum horizon is very high; Low residual life less than 0. 2%.