| Wind power generation technology has a broad space for development and application.While continuously increasing the installed capacity,large-scale wind turbines are facing more optimized design and more complex working conditions,and a series of wind turbine vibration problems have become more prominent.In this paper,based on the Lagrange equation in generalized coordinates,an 8-degree-of-freedom fan dynamics model is used to analyze the dynamics of the 5WM wind turbine,and the vibration of the tower surface is considered to be reduced.The main work completed in this article is as follows:(1)Summarized the structure of various types of wind turbines and the characteristics of various loads,introduced common fan vibration reduction,vibration isolation schemes and specific vibration reduction measures for some generator sets.(2)Based on Lagrangian dynamic equation,combined with leaf element theory,the 8-degree-of-freedom fan model is derived,and a highly reliable numerical simulation analysis is compiled.After adding Rayleigh damping,the displacement response characteristics of the overall structure of the fan under free vibration and simple harmonic vibration are analyzed.(3)Based on the momentum-leaf theory and introducing the Prandtl tip loss correction factor,the blade induction factor is iterated,considering the wind shear effect and the tower shadow effect,the motion of each blade under steady wind load in rotation is obtained In response,the movement characteristics of the fan under steady wind load are analyzed.(4)Establish the equation of motion of the tuned mass damper outside the tower surface,and analyze the damping effect of the TMD on the blade and tower cylinder under the rated wind load. |
