A damping-reinforced anti-vibration hammer based on negative-stiffness mechanisms for transmission lines

Anti-vibration hammers have been widely installed on the transmission lines to mitigate aeolian vibrations. However, accidents due to aeolian vibration still occur frequently in practical engineering. To improve the vibration control efficiency of transmission lines, this paper proposes a damping-reinforced anti-vibration hammer (DRH) based on negative-stiffness mechanisms. It provides an effective reference direction for the innovative design of anti-vibration hammers. First, a structural scheme is introduced for DRH, along with the derivation of their vibration equations and mechanical impedance. Then, the vibration equations of a transmission line equipped with anti-vibration hammers are derived, and these equations are then solved using the finite difference method. A numerical simulation and a comparative study are conducted to verify the effectiveness of the proposed DRH. The simulation results indicate that the proposed DRH exhibits a remarkable suppression effect on the vibration of the transmission line and has the potential to improve its adaptability to installation positions. A physical prototype of the DRH has been fabricated, and an experimental platform has been established to measure its power dissipation. The results demonstrate that within the 20–60 Hz scanning window, the conductor equipped with the DRH prototype consistently dissipates more power than the same conductor without any damper.