Dynamic Response Analysis Of Wind Power Generation Tower

Nowadays,the wind power generation industry has attracted wide attention in many countries.Wind turbine is the main structural equipment for collecting wind resources to generate electricity.In order to obtain more efficient generating capacity,the power of wind turbine needs to be appropriately increased.The structure height of the turbine is increasing correspondingly,and the safety of the structure is also facing severe challenges.Therefore,it is of great significance to analyze the static and dynamic response and structural stability of large wind turbine tower under multiple working conditions for the structural safety of the unit.In this paper,the design parameters of 3MW wind turbine are used to establish a complete finite element structure model in ANSYS Workbench 19.0 software.The steady state fluid-solid coupling analysis is carried out for three wind speed conditions,and the structural response of wind turbine under different wind speeds is obtained.The natural modes of the tower are solved,and the transient structural responses of the tower at rated and variable wind speeds are analyzed.The nonlinear buckling problem of tower under different working conditions is studied and the structural stability analysis is analyzed.The conclusions are as follows:(1)The results of steady-state fluid-solid coupling analysis show that under three wind speed conditions,the wind pressure mainly act on the blades and towers.The displacement at the top of the towers is the largest and the stress in the middle and upper part is the largest and concentrated,and the stress concentration at the four corners of the tower gate is obvious.(2)Under the working conditions of inlet wind speed,rated wind speed and cut out wind speed,the stress distribution and top displacement of the designed tower are compared with the traditional tower of the same type.Compared with the traditional pylons of the same type,The results show that the designed pylons are smaller than traditional pylons in stress and displacement,and have some advantages in structural performance.(3)By analyzing the natural frequency of the tower,the first six natural modes and modes are solved.Through transient response analysis,it is found that the tower generates periodic attenuation vibration under rated working condition.In the case of variable wind speed,the tower has periodic changes,and the stress and displacement of the tower are the maximum when the third order vibration occurs,and the structure conforms to the design requirements.(4)The buckling limit load and buckling mode of tower are obtained by nonlinear buckling analysis under axial force.The nonlinear buckling factor of the tower is smaller than the linear buckling factor in the limit state of three kinds of complex forces,and all of them meet the requirements of the standard design.