As a necessary part of connecting and force transmission in mechanical equipment, gearbox system is played a comprehensive role, with the development of modern industry. And gearbox is also the mechanical part which is damaged easiest. When the gear system works, periodic impulse impact force will produce owing to the faults of gear abruption or corrosive pitting, etc. So phenomena of modulation produced at this moment and spectrum of the vibration signal has symmetrical modulation side-bands besides the me...
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