Reliability analysis of wind turbine gear box based on fault tree and Bayesian network

Gear box is a key component of wind turbine, its reliability improvement directly affects the reliability of the whole wind turbine. In this paper, two main failure modes of the wind turbine gear transmission system are analyzed based on the fault tree and Bayesian network. They are tooth surface contact fatigue pitting and tooth root bending fatigue fracture. The reliability index of the gear drive system was derived and its weaknesses were obtained through two — way reasoning ability of Bayesian network. Provide a theoretical basis and reference for the rational design and reliability of the gearbox.