Study And Numerical Analysis Of Aeroelastic Model Of Typical Tower Structure

As the mainstay of transmission lines,transmission tower plays a vital role in the safe and stable operation of the power grid.In recent years,the collapse of the transmission tower,which has been affected by the wind,has seriously affected people's daily life and economic construction.The aeroelastic model wind tunnel test is one of the main methods to study the wind-induced vibration response of transmission towers.However,the influence of many factors such as complex transmission tower,imperfect theory and difficult model making needs further exploration.The wind tunnel test of transmission tower aeroelastic model is studied in this paper.It has a very important practical significance and engineering demand to solve many problems arising from the wind-induced vibration response of transmission towers,which will provide greater protection for the safe and stable operation of power grid.By taking the 110kV drum tower,the 500kV line wine cup-shaped straight tower and the 500kV line cat head straight tower as the prototype,finite element modal analysis was carried out,the aeroelastic model was made,and the wind-induced vibration test was completed.The main work is as follows:(1)Based on the research of domestic and foreign scholars,the finite element model of three kinds of transmission towers was established by using ANSYS software.The modal analysis was carried out,and the natural frequencies and modes of each order were obtained.Based on these,vibration situation were analyzed and compared,and their similarities and differences were summarized.Finally,the frequency of modal analysis was used to verify and correct the periodic formula of transmission tower.(2)The principle of similarity and dimensional analysis were introduced.The advantages and disadvantages of various methods for simulating aeroelastic models were analyzed.The design steps of aeroelastic model for transmission towers were described in detail.Aeroelastic model of transmission towers was established.Then,The modal vibration test was carried out on the model,and the natural frequency of the transmission tower was obtained by modal analysis to verify the accuracy of the model.(3)The wind field simulation principle was introduced,the wind field was simulated,the wind tunnel test under different wind speed and wind direction angle was carried out,and the time response map and power spectrum of the acceleration response were obtained.Combining with the modal analysis results,through the comparative analysis,it was concluded that the transmission tower vibrate in a narrow band,and the vibration frequency is relatively small,and the acceleration response is less affected by higher order.Wind speed and wind direction angle have significant influence on the wind-induced vibration response of transmission tower,and the acceleration response increases with the increase of wind speed.