Wind turbine gearbox dynamics

Planetary gears are the most common and important part of wind turbine gearbox, that is why understanding their behavior becomes essential. This paper is a review on the literature covering the wind turbine gearbox, further investigating different approaches followed when modeling gearbox system. Systems having one degree of freedom as well as having six degrees are investigated. Furthermore, transmission errors and tooth wedging are introduced, in relation with assembly discrepancies, as they are common problem arising in gearbox systems nowadays. A critical analysis to some of the literature works is formulated, also, conclusive remarks highlighting important area to be focused on is proposed.