Analysis On Wind-induced Vibration Response Of 1000kV UHV Steel Tubular Tower

The size of UHV transmission tower structure is very big,and the UHV transmission tower is very sensitive to wind load.Therefore,it is necessary to analyze the dynamic performance and wind vibration response of the UHV transmission tower.Based on the actual project,the UHV ac double linear SZ1 type tower are analyzed,and its natural frequency,vibration mode and the wind vibration response curve is achieved.First of all,the development of UHV is presented,the tower type are also introduced,the domestic and foreign research present situation is carried on from the wind tunnel experiment,research of the transmission tower,the wind load simulation research,the wind vibration response and control research,theoretical model studies four aspects,and combined with practical engineering background,this topic research is proposed.Secondly,the basic characteristic of the wind and the numerical simulation method is introduced.To the average wind,atmospheric boundary layer wind,the wind profile,and basic wind speed three concepts are stated,to the fluctuating wind,wind turbulence intensity,turbulence integral scale,power spectral density function,spatial coherence function four concepts are carried on in detail.Two kinds of simulation methods of wind,including Linear filtering method and harmonic synthesis method,are elaborated.the segmentation process is conducted for SZ1 type tower,and the linear filtering method is used to simulate wind for each segmentation.Thirdly,the finite element method and ANSYS finite element software are introduced,the finite element model of SZ1 type tower is established,the natural frequency and modal characteristics are analyzed,and the top-ten order natural frequency and vibration mode is achieved.Finally,the calculation of transmission tower wind load,transmission tower power balance equation solution and the processing of damping matrix are analyzed,SZ1 type wind vibration response is calculated,the displacement,velocity and acceleration response of the upper,middle,lower line-hang point are listed.And on the basis of the analysis of calculation results,the vibration control method of the transmission tower are discussed in this thesis.