Mingliang Yang, Qiang Deng, Peng Wang, Chao Wang, and Zheren Li. Wind Induced Vibration Control of Fan Towers Based on Semi-Active. Dynamic Systems and Applications 29 (2020) No. 7, 2505 – 2530

https://doi.org/10.46719/dsa202029710

ABSTRACT.
The traditional passive TMD (tuned mass damper) control technology for structural vibrations is not ideal for wind-induced vibrations of fan towers, especially in harsh and variable environments where the vibration attenuation effect of the method is greatly reduced. In this study, a semi-active control algorithm is proposed to control the wind induced vibrations of a fan tower structure. First, the active optimal control algorithm was obtained using the LQR (linear quadratic regulator) active optimal control algorithm. A semi-active control algorithm was then established to control the output of the active variable damping device and the equivalent control force of the active optimal control force to realize the active control effect. Through the establishment of the TMD active variable damping system, the wind-induced vibration control of the fan tower structure was carried out. The PSD (power spectral density) random vibration responses of a fan tower structure under rated, cut and, limit wind conditions were compared under uncontrolled, passive, and semi-active control, and it was found that the response of the fan tower structure under semi-active control was the smallest. The results showed that the semi-active control mode could control the damping force to maintain a stable and efficient vibration control effect as the wind conditions changed in the harsh and variable environment.

Keywords: active optimal control algorithm LQR, PSD random vibration response, semi-active control algorithm, TMD active variable damping system.