Research on nonlinear dynamics of planetary gear system of wind turbine gearbox considering wear

A planetary gear dynamics model was developed based on the complex operating characteristics of the wind turbine planetary gear train, and the time-varying torque induced by wind speed is obtained by modeling the wind speed with a four-component wind speed, and the time-varying mesh stiffness of the gears, which takes into account the tooth-coupling effect, is introduced into the stiffness excitation of the dynamics model. The Archard wear model is combined with the gear dynamic load to calculate the tooth wear of the planetary gears under different wear cycles, and the nonlinear dynamic characteristics of the system under different wear levels are obtained by combining the gear wear with the static transmission error and introducing the gear wear into the dynamics model. The results show that the wind turbine planetary gear system without wear under constant torque has good bifurcation characteristics, and the introduction of time-varying torque has a limited effect on the nonlinear dynamic response of the system, and the trends of the bifurcation diagrams of the two are basically consistent. After the introduction of wear faults in the system, the dynamic response changes greatly, there is no single motion state in the bifurcation diagram, almost all chaotic motion, vibration displacement and meshing force appears to increase exponentially, the complex side bands in the frequency domain diagram continue to increase, the phase diagram range will gradually expand and chaotic, the distribution of points on the Poincaré cross-section will be more dispersed and not regular. The vibration of the gear is aggravated, and the stability of the system is seriously affected.