LQG control of along-wind responses of tall building using composite tuned mass dampers

A composite tuned mass damper (CTMD) is a vibration control device consisting of an active-passive tuned mass damper supported on the primary vibrating structure. The performance of CTMD in mitigating wind-induced vibration of tall building is investigated. Optimum parameters of a passive tuned mass damper (PTMD) for minimizing the variance response of the damped primary structure under random loads, with different mass ratio of an active tuned mass damper (ATMD) to a PTMD have been used for the optimum parameters of CTMD. The active control force generated by ATMD actuator was estimated by using linear quadratic Gaussian (LQG) controller, and the fluctuating along-wind load, treated as a stationary random process, was simulated numerically using the along-wind load spectrum proposed by Solari .Comparing the along-wind rms response of tall building without a CTMD, the CTMD is effective in reducing the response to 40%∼ 45% of the response without the CTMD. Therefore, the CTMD system was effective in reducing wind-induced vibration of tall building.