Through the research on the relationship between helical gear modification and friction excitation, the coupling dynamic model of helical gear modification and friction excitation is established, and the influence of helical gear modification and friction on the dynamic response characteristics of helical gear system is analyzed; The acoustic boundary element model is established to simulate the influence of helical gear modification and friction on the vibration and noise of helical gear system. The main research contents are as follows:
Basic theory of helical gear dynamics and calculation of static transmission error after modification. On the basis of discussing the relevant basic theories of gear dynamics and modification, the optimal modification amount of helical gear profile modification and tooth direction modification is determined based on romax software, and the transmission error curve after tooth profile modification and tooth direction modification is calculated.
Research on calculation method of friction excitation and stiffness excitation of helical gear. Assuming that the load is evenly distributed along the length of the contact line, based on the calculation method of time-varying contact line, time-varying friction and time-varying friction considering time-varying meshing force, the time-varying contact line, time-varying friction and time-varying friction torque of helical gear system are calculated, and the effects of different helix angle and different contact tooth width on the time-varying contact line The influence law of time-varying friction and time-varying friction torque; Based on the calculation method of helical gear meshing stiffness per unit contact line length of tooth profile end face, the meshing stiffness before and after helical gear modification is calculated.
Coupling dynamic modeling and simulation analysis of helical gear modification and friction excitation. Considering the influence of helical gear modification on friction excitation, the coupling dynamic model of helical gear system modification and friction excitation is established by using the concentrated mass method, and the dynamic response results of helical gear are calculated; The effects of different friction coefficients on the dynamic response characteristics of helical gear system are obtained.
Noise simulation analysis of dynamic response based on the coupling of modification and friction excitation. The acoustic boundary element model is established. Based on the dynamic meshing force obtained from the coupling dynamic response analysis of helical gear modification and friction excitation, the vibration and noise of helical gear system are simulated and analyzed, and the effects of different friction coefficients before, after and after helical gear modification on the vibration and noise of helical gear system are obtained.