Application of Green’s function in frequency solution for wind turbine blade modelled as box beam

Abstract In order to study the vibration of composite wind turbine blades, a Green’s function method for frequency calculation is proposed. Based on the variational asymptotic method and Hamilton principle, the mechanical model of wind turbine blade, modelled as box beam with composite laminated structure, is established by using circumferential asymmetric stiffness design. The Green function method is used to analyze the frequency of wind turbine blades from the aspect of ply angle, and the numerical examples are compared with other calculation methods. The results show that the Green function method has good accuracy.