A Dynamic Study to Single-Stage Helical Planetary Gear Systems of Wind Turbines Including Gravity and Gear Backlash Effect

摘要

Giant MW scale wind turbines generally must situate in the harsh operation condition due to extremely fluctuating wind and grid safety complexity. System operation reliability is greatly affected by their gear transmission lines. Recently, nonlinear dynamic effect including gravity and gear backlashes has been highly concerned. In this study, dynamic analyses are executed on a single-stage helical planetary system using a 3D discrete stiffness model. Since the meshing backlashes of gears are incorporated, the nonlinear phenomenon of contact separation, back-contact, or even double side contact may occur. The models of bearing stiffness, weight, and inertia of wind rotor and generator are also included. Accordingly, the dynamic responses of the gear system can be analyzed under different operation conditions. The dynamic contact forces between gear pairs and planet bearings are calculated. Accordingly, the nonlinear dynamic characteristics of planetary gearing are investigated by incorporating the gear backlashes and gravity models. The result shows the essentiality of the incorporation of gear backlashes and component gravity effect in the dynamic analysis of the gear system.