The vibration and noise of the gear transmission system are caused by the following aspects:
(1) Gear design. The transmission system is composed of 14 large and small gears, and the gear design parameters are improperly selected; The overlap is too small; Improper or no tooth profile modification; Unreasonable structural design of gearbox, etc.
(2) Gear processing. Base pitch error and tooth profile error are too large; Excessive backlash at tooth side; The surface is too rough, etc.
(3) Gear train and gearbox. The internal structure of compound planetary gear is complex, which will cause assembly eccentricity; Low contact accuracy; Parallelism difference of shaft; Insufficient stiffness of bearing and support; The rotation accuracy of the bearing is not high and the clearance is improper.
(4) Other aspects. Fluctuation of input torque and load torque; Torsional vibration of shafting; Balance of motor and other transmission pairs, etc.
The difference between gear transmission and general mechanical system lies in the existence of internal excitation. The important characteristic of internal excitation of gear system lies in its periodicity. Therefore, it is particularly suitable to study by spectrum analysis method. The periodic internal excitation is described by static transmission error, and the Fourier change of static transmission error function is made for spectral decomposition, so as to determine the main factors affecting internal excitation, In order to take more effective measures to reduce internal incentives.