Strength analysis of MW wind turbine hub and pitch stop
                   LI Yongkui, YANG Yang, HE Haijian, LI Chengchen,LIU Xiaohui, ZHANG Chuxiang, SUN Gangfeng
                                     (Xuchang XJ Group Wind Power Technology Company, Xuchang 461000, China)

Abstract: Aiming at the strength safety problem of MW wind turbine hub, the ultimate and fatigue strength of a certain high level wind turbine hub were analyzed, by method of combination of the global model rotor and the submodel hub, and integration of critical plane method and maximum principal stress algorithm, using the finite element analysis software ANSYS and the fatigue analysis software FEsafe, with consideration of the nonlinear effects of pitch bearings. A pitch cushioning device was designed in the hub assembly system to stay the blade at feathering position, and the ultimate strengths of the pitch stop and the stop notch, components of the pitch cushioning device, under feathering conditions were analyzed. The results indicate that the ultimate and fatigue strength of the hub, and the ultimate strengths of the pitch stop and the stop notch can all meet the design requirements, which provide a certain reference for the design of the hub and the pitch cushioning device.

Key words: wind turbine; hub; pitch stop; strength analysis