The characteristics of gear transmission are: smooth gear transmission, precise transmission ratio, reliable operation, high efficiency, long life, and a wide range of power, speed and size. Advantages: 1: high transmission efficiency; 2: large transmission ratio; 3: large transmission torque; For rolling bearings, when the roller, inner ring and outer ring of the bearing have local irregular damage, such as peeling, pitting, cracks, etc., during the operation of the bearing, other parts of the bearing will inevitably hit the fault parts intermittently, resulting in impact, which will arouse the resonance of the bearing seat or other mechanical parts and form a series of impact vibrations. The measured bearing vibration signal contains a lot of other vibration signals besides the impact vibration caused by damage. For bearings with only early faults, the impact signal caused by damage is extremely weak and submerged by normal vibration signals, so it is impossible to detect the vibration signal directly by spectrum analysis. The frequency spectrum of vibration signal also has two obvious characteristics. One is that all frequency components after strong impact are retained. The other is that the high-frequency resonance peak group is clearly displayed in the spectrum. Because the bearing seat has a quite high natural frequency as other mechanical parts, the spectrum peak group of resonance reaction will appear in the high-frequency area. In general, the vibration signal does not contain high-frequency components, so the high-frequency natural vibration generated by impact will be less disturbed by the normal vibration signal.
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