The study of aeroelastic stability for wind turbine blades

In this paper, a 15 DOF elastic beam element is developed. Hodges-Dowell´s partial differential equations are adopted as blade motion equations, but gravity effect is included also. The nonlinear aerodynamic force is calculated by BEMT combined with the Raj 3-D stall-delay model. Then the aerodynamic model is coupled into the structural dynamic model. The equations of motion for the nonlinear periodic time variant system are calculated by implicit Newmark scheme. Finally, the aerodynamic model is verified and shows good agreement with experiment data. An engineering example on wind turbine is carried out by this coupled model. The result is compared with results in other literatures. The gravity effect is focused. And the blade response under different condition is present and discussed.