Study on Critical Parameters of Non-linear-stiffness Anti-galloping Device for Ultra-High-Voltage Transmission Line

Galloping is one of the most common natural disasters that threat the Ultra-High-Voltage transmission lines’ safe and stable operation. To transfer and absorb the energy of galloping for iced conductors in broad range of frequencies, as well as protect conductors and fittings more efficiently to prolong their service lives and decrease the accident rates, Nonlinear Energy Sink method has been introduced into anti-galloping research work. First, theoretical coupling model describing vibration of vertical freedoms of conductor and anti-galloping device with nonlinear cubic stiffness has been built. Aiming at making energy of primary structure minimization and optimizing anti-galloping device’s critical parameters, this paper provides a way to obtain the corresponding optimized values of mass, damping and nonlinear stiffness for non-linear-stiffness Anti-galloping Device. Finally, taking two span lines as typical examples, corresponding optimal rules has been revealed. Therefore, this paper provides theoretical and engineering basis for the application of Nonlinear Energy Sink Method in research on anti-wind-induced-vibration work of Ultra-High-Voltage transmission lines.