Modal Prediction and Sensitivity Analysis of Wind-Turbine Planetary Gear System with Flexible Planet Pin

A lateral-torsional coupled dynamic model of the wind-turbine planetary gear system is built by considering the effect of the flexibility of the pin as well as the gyroscopic effect. Natural characteristic of the system is conducted and three classical modes, rotational modes of the sun gear, the carrier as well as the ring, are obtained through the conduction of the relationship of the eigenvalue and the mode. Sensitivity analysis of the effect of the natural frequency on supporting stiffness, torsional stiffness and the mesh stiffness is proposed and the relationship of the stiffness and the modes are found. Supporting stiffness affects the translational movement while the torsional stiffness affects the rotational movement, neither of those stiffness affect the modes of the planetary gear. Mesh stiffness has a great effect on translational movement and the rotational movement but without an effect on the planetary gear modes.