Gears transmit power between the main and passive gears by the meshing force on the tooth surface. The meshing force always acts on the line of action (LOA). Therefore, the dynamic analysis of gear transmission by the excitation on the meshing line has always been the focus of research.This excitation is essentially displacement excitation, i.e. the difference between the displacement of active and passive gears moving on the meshing line, which is defined as transmission error (TE), which is mainly caused by the fluctuation of the meshing rigidity of the gears and the tooth profile error.

The gear noise directly associated with it is a high frequency noise with a single frequency, called gear squeal, which is easily recognized and unpleasant even at low amplitudes.Therefore, most of the research on noise reduction of gear transmission focuses on the reduction of excitation on the meshing line, such as reducing transmission error by reasonable profile modification.

Starting from drive error excitation and taking a mechanical transmission in development as the carrier, the dynamic optimization and noise reduction of gear transmission are studied.Firstly, the transmission dynamic simulation model is established to analyze the inherent dynamic characteristics and the dynamic response of the system under the excitation of transmission error. Based on the profile optimization, the drive error excitation is reduced, and the sensitivity analysis of the profile modification scheme is carried out considering the manufacturing error.