Abstract: In order to enhance the vibration suppression effect of large wind turbine blades, from the perspective of increasing the structural damping of the blades, the 8 MW wind turbine blades are taken as the object of study, and the design of the damping layer and the position of the damping layer are used to provide the basis for establishing the finite element model of the damping blade. SHELL181 and SOLID185 elements are used to simulate the upper and lower skins and damping layers of the blades, modal analysis are performed on the two models of undamped blades and damped blades, and the effect of the thickness change of the damping layer on the overall quality, natural frequency and structural loss factor of the original blades are discussed. The optimal laying thickness of the damping layer of the damping blade of the 8MW wind turbine is determined. Finally, based on the optimal damping layer thickness, the two types of blade vibration suppression effects are compared and analyzed. Combined with the structural loss factor, it is found that the thickness of the damping layer is not as large as possible. The optimum thickness of damping layer on the original blade can improve the ability of vibration suppression with little mass increase.

Key words: wind turbine blades, damping constraint structure, structural loss factor, flutter suppression