Vibration reduction optimization of transmission tower-line system based on different control schemes

A three-dimensional finite element model of a double circuit transmission tower-line structural system is established and validated in this study. Based on the Kaimal wind speed spectrum and considering spatial multi-point correlation, the fluctuating wind speed time history of the transmission tower-line system is simulated. On this basis, four vibration control schemes are proposed using viscous dampers. The vibration control effects of acceleration, base shear force, and member axial force on the double circuit transmission tower-line structure system are studied based on the four control schemes. The results show that the finite element model constructed can well reflect the dynamic characteristics of the transmission tower-line system, with an error of only $5.5 \%$ compared to the theoretical analysis. The simulated spectrum of fluctuating wind speed matches well with the target spectrum, and the fitting of fluctuating wind speed has good reliability. Under different wind vibration control schemes, good vibration control effects are achieved, and the control effect gradually increases with the increase of the number of viscous dampers and the damping coefficients. Considering the wind vibration control effect and installation & maintenance factors, it is recommended to adopt scheme $\mathbf{C}$ as the optimal control scheme.