Research on nonlinear dynamic characteristics of large scale wind turbine blade in flow fields

The finite element model of the 1.5MW wind turbine rotor in flow fields is modeled by the finite element method. By simulating the extreme operation gust (EOG) of flow fields with the wind turbine rotor, the calculated fluid pressure is loaded to the rotor to build the dynamic model of whole wind turbine set for the transient analysis and calculation. According to the dynamic characteristics analysis of blades, the position of key nodes is identified and the frequent-domain response of key nodes´ acceleration is worked out. By analyzing the nonlinear dynamic characteristics of blade, we can obtain the damageable dynamic characteristic parameters of key nodes, which provide an important reference to blade dynamic damage monitoring in the condition of wind fields.