Aeroelastic Responses for Wind Turbine Blade Considering Bend-Twist Coupled Effect

The Euler-Bernoulli beam model coupled with the sectional properties obtained by the variational asymp totic beam sectional analysis （VABS） method is used to construct the blade structure model. Combined the aerody- namic loads calculated by unsteady blade element momentum model with a dynamic inflow and the dynamic stall correction, the dynamics equations of blade are built. The Newmark implicit algorithm is used to solve the dynam- ics equations. Results of the sectional properties and blade structure model are compared with the multi-cell beam method and the ANSYS using shell elements. It is proved that the method is effective with high precision. Moreover, the effects on the aeroelastic response caused by bend-twist coupling are analyzed. Torsional direction is deflected toward the upwind direction as a result of coupling effects. The aerodynamic loads and the displacement are reduced.