Analysis of dynamic characteristics of rotating wind turbine blade with centrifugal stiffening effect

The dynamic characteristics of wind turbine are directly affected by the dynamic characteristics of blade,so it is necessary to study the dynamic characteristics of rotating blade.The rotational blade with the effects of gravity force and centrifugal force will cause centrifugal effect,and will change the blade's dynamic characters.Based on the concept of spacial plane and finite element method,this paper calculates the axial force plane of blade nodes and the first three orders of natural frequency plane with two variable parameters of time and rotational speeds,and the stiffening coefficient is also used to describe the stiffening degree of the blade,and then presents the correction formula of frequency.The result shows that the method used in this paper can simulate the dynamic characters of rotational blade with centrifugal stiffening effect,and reflect the practical dynamic characters of the blade more accurately.