Optimal design of an array of active tuned mass dampers for wind-exposed high-rise buildings

Abstract

In this paper, a comprehensive procedure is developed for the optimization of a hybrid control system for tall buildings subjected to wind-induced vibrations. The control system is made of active tuned mass dampers (ATMDs) and is conceived to mitigate the flexural and torsional response in serviceability limit state conditions. The feedback information necessary to compute the control forces is provided by a limited number of accelerometers arranged over the building's height. To reduce the computational effort, subsequent optimization subprocedures are employed that take advantage of the genetic algorithm to find the solution of the nonlinear, constrained optimization problems. At first, the optimization of the ATMDs' number and positions over the top floor of the building is carried out. Then, the optimal location of the accelerometers over the building's height is obtained. The reduction of the flexural and torsional accelerations is chosen as target of the optimization problem. The technical limitations of the ATMDs, such as the actuators saturation and the limited stroke extensions, are the constraints to the problem. As an illustrative example, a control system is optimized for the response mitigation of a tall building subjected to wind load. Figure 6. Displacements in the x (a) and y (c) directions and rotations (e) at the top floor and corresponding power spectral densities (b, d, f) for the uncontrolled, passively controlled and actively controlled systems.

Free Vibration Response of a Frame Structural Model Controlled by a Nonlinear Active Mass Driver System

“…On one side, analytical studies on the definition of original control algorithms for constrained systems and on the optimization of noncollocated control systems [15,16] were developed. On the other side, laboratorial experimental work has been carried out to implement a control system made of an active mass driver system [17].…”

Frequency‐independent hysteretic dampers for mitigating wind‐induced vibrations of tall buildings

“…Another mean of enhancing the efficacy of a TMD is to use externally powered actuators to continuously tune the stiffness and damping of the TMD, depending upon the feedback response obtained from the parent structure. These mechanisms are termed active, semiactive, or smart TMD (ATMD, STMD) . Though substantially effective, active systems require external power, which might range to megawatts .…”

“…These mechanisms are termed active, semiactive, or smart TMD (ATMD, STMD). [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Though substantially effective, active systems require external power, which might range to megawatts. 33 Also, power failure is very common during windstorms.…”

Input space-dependent controller for multi-hazard mitigation

“…Semi-active and active structural control systems [1][2][3] have gained popularity in the field of structural control. Compared with passive systems, they are typically capable of substantially better mitigation performance over a larger excitation bandwidth.…”