Analysis of static and dynamic characteristics of wind turbine blades considering dynamic stiffening effect

Wind turbine blades are the core components of wind turbines. Their static and dynamic responses under complex load excitation have an important impact on the power generation performance and operational safety of the unit. Based on the rigid-flexible coupling dynamics theory, this paper establishes a static and dynamic analysis model of wind turbine blades in complex environments. During the rotation of the blades, the centrifugal force and gravity components acting along the span direction lead to dynamic stiffening, which significantly reduces the blade The low-order natural frequency increases the risk of resonance and threatens the safe operation of the unit. However, the existence of radial force suppresses the deformation of the blade in the swinging direction to a certain extent, which helps to achieve the lightweight design of the blade.