Vibration Simulation Of Wind Turbine Tower Under Earthquake Excitation

In recent years,with the rapid development of wind power in our country,the wind power generation technology has also reached a high level.With the increase of new wind turbines in China,many new wind turbines are now installed in the more seismically active areas.The wind turbine tower plays a supporting role in the operation of the fan.In the operation of the fan,the tower tends to vibrate or even change its shape,which will affect the stability of the fan’s normal operation.Studying the vertical and horizontal vibrations of wind turbine towers with different structural shapes under seismic excitation,and predicting the response of towers under seismic excitation is of great significance for improving the stability and reliability of wind turbine operation.Because of this,the main research work in this paper is as follows:Firstly,the main form of wind turbine tower,the environmental load of operation and its calculation method are studied.The mechanical model of tower longitudinal vibration is established based on the mutual influence of foundation foundation and the neglect of foundation and foundation.Secondly,a mathematical model of the tower’s longitudinal vibration was established based on the theory of elastic bodies.For the constant cross section and variable cross section tower,the vertical vibration mode equations of the tower are established considering the boundary conditions of tower longitudinal vibration and the natural frequency and the vibration response of the tower.Through the comparison and analysis of the results obtained from different models,the influence of cabin quality and foundation stiffness on the natural frequency of the tower was obtained.Thirdly,establish the tower lateral vibration mechanics model.Considering and not considering the interaction of foundation and so on,the finite difference method is applied to modal analysis to solve its natural frequency and to analyze the influence of vibration modes of different models.Finally,considering the influence of longitudinal vibration on transverse vibration,the transverse vibration response of the tower is solved and analyzed.