| The transmission tower-line system,as the carrier of high-voltage electrical energy transmission,is an important lifeline project.The high-voltage transmission tower-line system has the characteristics of high tower structure,large span and flexibility,and its tower coupling vibration response is very obvious under the action of external forces such as wind and rain.In China,the theoretical research on the transmission tower line system under coupling is not enough enough,which leads to frequent tower collapse under external load,which seriously affects the safety of transmission lines.Therefore,it is of great engineering significance to establish an aeroelastic model of the transmission tower-line system structure and perform modal analysis,and further study it theoretically and experimentally.Based on the current research status of transmission tower and line systems at home and abroad,based on experiments,this paper conducts a systematic study on the dynamic response of typical transmission tower-line systems.First,this paper uses ANSYS to establish three typical transmission tower finite element models,and completes wire finding based on the catenary element method.The beams are simulated by BEAM188 beam elements,and a three-element two-wire system finite element model is built to analyze three typical transmissions.The dynamic response of the tower finite element model and the three-tower two-line coupled system finite element model obtained the natural frequencies,damping and mode shapes of each order.Secondly,using the dimensional analysis method and similarity criteria,the corresponding similarity coefficient selection,design principle and processing and assembly process of the aeroelastic model of the transmission tower are discussed in detail.An aeroelastic model of the transmission tower-line system was constructed by simulating the transmission conductance(ground)line and the corresponding spacer rod,and the reliability of the design model was verified by finite element analysis.Finally,the dynamic characteristic calibration was performed to obtain the frequency of the aeroelastic model and verify the model.accuracy.Finally,the hammer test was used to stimulate the aeroelastic model for modal tests.Acceleration sensors were used to collect the acceleration response at 8 measurement points to obtain the test modes such as the transmission tower natural frequency,mode shape and damping ratio.The comparison between the hammer test and the finite element mode is used to verify the rationality of the finite element model of the transmission tower and the modification of the aeroelastic model. |
