Finite Element Analysis Of Dynamic Characteristics Of Wind Turbine Blade Based On Airfoil Structure

The blade is the key component of the wind turbine to absorb wind energy,which determines the wind energy utilization effciency and aerodynamic load.The stresses produced by different airfoil structures are different,which will have a greater impact on the safe operation of the blade.In this paper,the research object is a kind of 2MW wind turbine blade,and the influence of wind turbine blade airfoil structure dynamic characteristics is studied by using finite element analysis software.It is of great significance to ensure the safe operation of the wind turbine.Firstly,the 3D shell models of the single and double web wind turbine blade are established by using 3D drawing software.The established models are introduced into the ACP composite analysis module in the finite element analysis software ANSYS WORKBENCH to set up the parameters,so as to establish a finite element analysis model.Secondly,the modal,stress and strain analysis of the wind turbine blades with single and double web airfoil structures are carried out.The natural frequencies,stress,strain and tip deflection of the wind turbine blades witih single and double web airfoil structures are investigated.The results show that the natural frequency of the single web blade is slightly larger than that of the double web blade.The maximum stresses of the single and double web blades are respecrtively 198.51MPa and 179.14MPa.The maximum strains are respectively 0.611%and 0.497%.And the tip deflections are respectively 2.467m and 2.357m.So the maximum stress and deflection of the double web blade are smaller than the single web blade.It can be seen that the mechanical properties of the double web blade are better than that of the single web blade.Finally,based on the above analysis,5 sets of finite element models of the wind turbine blade with different shear web position are established.The modal,stress and strain analysis are carried out,and the influence of web position on the dynamic characteristics of the wind turbine blade is studied.The results show that the stress and strain values decrease firstly with the increase of web spacing,and then increase.The stress and strain values are reached a minimum value of 160.98MPa and 0.485%at the web position 4,whose the leading shear web is at the 0.19c and the trailing shear web is at the 0.44c.At the same time,there is a little difference in the deformation degree of each web positions.In summary,the mechanical properties of the web position 4 is better than those of the other web positions.