Abstract: The transmission system of gearbox used in a large-scaled wind-driven generator is analyzed with application of the theory of engagement, gear system dynamics and nonlinear dynamics. The nonlinear coupling dynamic system with multi-speed gear-driven, which includes the gears, transmission shafts and gear box, is established based on considering time- varying stiffness, running clearance and manufacturing errors. The dynamic characteristics of the coupling system are analyzed when the internal excitation to the system is considered. The analytical results provide theory basis for optimizing dynamic performances of the transmission system.

Key words: Coupling, Dynamics, Gear box, Nonlinear