Smart Hybrid Control For Vibrant Responses Of High-rise Truss Tower

High truss towers such as TV towers and transmission towers vibrate excessively because of their obvious height and soft property. Due to their uneven distribution of mass and stiffness, TV towers present remarkable whiplash effects Similarly, large span transmission towers present obvious vibrant responses because of the small stiffness, small damp and coupling vibration of tower line system. Therefore, it is essential to take effect measures to suppress the excessive vibration of high truss tower to ensure their safety. The Hefei TV tower and Xingjiang transmission tower are used in this paper as engineering background to study the application of passive and intelligent semi-active friction dampers in wind-induced and seismic vibration control of high-rise truss tower.A three-dimensional finite element static model of TV tower is first constructed by using beam and link elements respectively and the analysis and comparison of its dynamic characteristic are executed. A two-dimensional lumped mass dynamic model is then reduced from the three-dimensional model when incorporating several assumptions. Along-wind loading is digitally simulated with the aid of random vibration theory and used as load input of dynamic analysis of wind-excited tower. Several issues corresponding to selection and retreatment of earthquake wave are also discussed in this paper as a preliminary study of TV tower's seismic vibration analysisMulti-particle model of the wire for dynamic analysis is studied in detail in this paper with the corresponding parameter analysis and discussion about the results Basing on the famous FEA software ANSYS, this research performs a further exploitation to construct the APDL(ANSYS Program Design Language) module of mechanical analysis of transmission tower. Subsequently, the three-dimension space finite element model of Xiangjiang transmission tower is established and its dynamic character is analyzed. Furthermore, multi-dimension along-wind loading is digitally simulated and the dynamic character, wind-induced responses and seismic responses of tower-wire coupled system are studied respectively.The mechanical models of passive friction dampers are studied and a force-deformation relationship basing upon slip history of dampers is put forward in this paper and an actual damper device is designed for vibrant control of truss tower. With the latest development of semi-active damper and intelligent material, this paper discusses the constitution and properties of two kinds of intelligent semi-active dampers. The piezoelectric semi-active friction damper device is designed and the relationship among piezoelectric parameters, external voltage, damperparameters and slip force are formulated. Simultaneously, the revised Bingham model of MR damper is introduced detailedly in line with the experiment results.The wind-induced and seismic vibration control of high-rise truss tower using passive and intelligent semi-active dampers are systematically studied in this paper. After detailed parameter studies of three kinds of dampers in vibration reduction of High-rise truss tower, this paper analyzes several important factors which greatly affect the damper's vibration abating performance and draws some valuable conclusions for design of dampers. With regard to semi-active control algorithm, an fixed-increment control algorithm based on local feedback and a fuzzy semi-active control algorithm based on intelligent control theory, which are applied in vibration control of truss tower, are put forward in this paper. The results indicate that intelligent dampers using the two algorithms can effectively reduce the seismic and wind responses, and the control effects aren't sensitive to external load intensity. The parameter analysis shows that the factors of semi-active control algorithm have great influence on control effect. Obviously, the reasonable parameters are necessary for excellent control effects.According to the actual control of wind-excited Wang Jiatan Hanjiang large-span transmission tower, this paper puts forward a p...