Analysis For Dynamic Of Gearbox Trains Of Large Scale Wind Turbines

As the rapid development of regenerationtive energy mark, wind energy as a kind of clean and renewable energy has attracted more and more attention. Followed the wind power technology has been rapid quickly. The wind turbine gearbox transmission system is one of the important components, and its main function is to increase the speed by the gearbox. Due to the randomness of the velocity, the gearbox transmission system works long-term under the complex alterate load, which will cause the damage of the internal structure of the gearbox transmission system, reduce the gearbox transmission system’s stability, and increase the workload in maintenance. In order to reduce gearbox failures caused by vibration, improve the reliability of wind turbine gearbox system. Therefor it is necessary to drive dynamics analysis for wind turbine gearbox system.This article introduces the drive system dynamics analysis of the status, the vibration under the operating conditions, and analysis the coupling vibration of the gearbox transmission system. The wind turbine gearbox transmission system was divided into therr part. The first stage planetary transmission system.Intermediate stage helical gear and the third stage helical gears. The lumped parameter method was applied. Meshing stiffness, meshing damping, comprehensive meshing error, eccentricity, bending-torsional coupling and rolling bearing were considered, and established straight gears, helical gears and planetary gear dynamics models. According to those models, Langrange’s quation was used to derive the dynamic equation of gearbox transmission system. On this basis, the fourth-order Runge-Kutta numerical method was applied. The dynamic responses of the transmission system are investigated based on internal and external motivation and analyzed the response in the frequency domain characteristics.The research of thie paper can provide some theoretical referemces for the engineering design of the wind turbine gearbox system and laid the foundation for the industry application.