Multi-Objective Optimization Design of TMD/ATMD to Control Tall Buildings against Earthquake Excitations Using Genetic Algorithms

Tuned mass dampers (TMDs) and active tuned mass dampers (ATMDs) are widely used for reducing vibrations in mechanical and civil engineering structures. The TMD acts as a passive device; however, the ATMD is a kind of active devices that using an actuator produces the controlling force. The main purpose of this study is Multi-Objective Optimization Design of TMD and ATMD devices to control the structural vibrations. For this purpose, a 12 story building has been simulated against the earthquake excitations. The TMD and ATMD devices are separately considered on the top floor of the building. To compare the efficiency of TMD and ATMD, the parameters of both devices have been optimally designed using multi-objective genetic algorithm in the same situation and the state feedback control is applied for controlling the force of the ATMD. The parameters of TMD include mass, stiffness and damping ratio, and those of ATMD are mass, stiffness, damping ratio coupled with the coefficients of the state feedback controller. This study investigates the coupled multi-mode of modal analysis with TMD or ATMD. The comparison of the simulated results shows that the performance of ATMD in reducing the vibrations due to strong earthquakes is better than the TMD.

کلیدواژه ها:

TMD ، ATMD ، Multi-objective optimization problem (MOP) ، Genetic algorithm ، State feedback control ، Earthquake excitation