Vibration Control of Steel Wind Turbine Tower Using a Novel Tuned Mass Damper Refitted via Inner Platform

Steel large-megawatts wind turbines have the light-damping and long-period properties, resulting in adverse vibrations under loads. In this paper, a novel tuned mass damper refitted via inner platform (IP-TMD) is proposed to control excessive vibration of steel turbine tower (WTT). Firstly, dynamic equation WTT controlled by IP-TMD system established according principle virtual work, its coefficient frequency ratio at corresponding fixed points are deduced. Then, optimal stiffness damping coefficients obtained optimization. Furthermore, numerical simulation research employed analyze frequency-response curves resonance mitigation effect harmonic excitation. Finally, efficiency calculated using Wilson-θ method loadings; results indicated that able reduce response over 45% compared with uncontrolled cases.