Study on the Rotation Effect on the Modal Performance of Wind Turbine Blades

With the large-scale development of wind turbines, large flexible blades bear heavier loads. In actual rotating work blades, coupling structural deformation and motion produces a dynamic stiffening effect spin softening effect, which affects characteristics blades. this study, finite element method is used to model NREL 5MW blade, effects are investigated using modal analysis. The influence on blade’s natural frequency revealed. It concluded that more significant than softening, comprehensive result two not simply superposition them but presents obvious nonlinearity.