Abstract
The vibration control and performance evaluation on a transmission-tower line system by using friction dampers subjected to wind excitations are carried out in this study. The three-dimensional finite element (FE) model of a transmission tower is firstly constructed. A two-dimensional lumped mass model of a transmission tower is developed for dynamic analysis. The analytical model of transmission tower-line system is proposed by taking the dynamic interaction between the tower and the transmission lines into consideration. The mechanical model of passive friction damper is presented by involving the effects of damper axial stiffness. The equation of motion of the transmission tower-line system incorporated with the friction dampers disturbed by wind excitations is established. A real transmission tower-line system is taken as an example to examine the feasibility and reliability of the proposed control approach. An extensive parameter study is carried out to find the optimal parameters of friction damper and to assess the effects of slipping force axial stiffness and hysteresis loop on control performance. The work on an example structure indicates that the application of friction dampers with optimal parameters could significantly reduce wind-induced responses of the transmission tower-line system.
Highlights
Overhead transmission tower-line system is a typical kind of electrical power infrastructures widely used throughout the world for energy supplying
The feasibility of using passive friction dampers to suppress the dynamic responses of a transmission tower-line system under wind excitations is performed in this study
A 2D lumped mass model of a transmission tower is developed for the dynamic analysis by simplifying the 3D finite element (FE) model
Summary
Overhead transmission tower-line system is a typical kind of electrical power infrastructures widely used throughout the world for energy supplying. Current studies on the vibration control of transmission tower-line systems focus on the application of dynamic absorbers and energy-dissipating dampers [10]. The friction damper is a typical energy-dissipating device utilized in the structural response control application and it can be manufactured as an axial member to replace common structural members of a tower without requiring the additional space occupancy. To this end, the vibration control and performance evaluation on a transmission tower-line system with passive friction dampers subjected to wind loading is actively carried out in this study. The made observations indicate that the passive friction dampers can be utilized to suppress the wind-induced vibration control of the transmission tower-line system due to its satisfactory energydissipating capacity if the damper parameters are optimally determined
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