Research on the Geometry Nonlinearity of Wind Turbine Blade

Abstract

It is presented that the nonlinear aeroelastic effect is considered for the dynamic response analysis of large scale horizontal wind turbine. The blade of wind turbine is built by composite laminate model using the finite element method. The unsteady aerodynamic loads are predicted with prescribed vortex wake method, which considers the aerodynamic-structural coupling effects. The aerodynamic loads are applied to the blade structure model, and the nonlinear dynamic aeroelastic equations are established. The equations are linearized and the blade modes are obtained at the static equilibrium position, thus the dynamic responses of a blade are calculated using the modal method. The results show that the geometry nonlinearity reduces the vibration amplitudes of the blade.