Performance Of Enhanced Hybrid Active Tuned Mass Dampers For Structures

The present paper put forward a new type of structural vibration control deviceenhanced hybrid active tuned mass dampers, referred to as EHATMD. Likewise, its optimum performance is researched. Main contents of this paper are as follows:(1) A linking dashpot is introduced between the controlled structure and smaller mass block in the hybrid active tuned mass dampers(HATMD), the EHATMD have been proposed to attenuate undesirable oscillations of structures under the ground acceleration.(2) The dynamic magnification factor(DMF) was formulated for the structure furnished with EHATMD. The criterion for the optimum searching can then be determined as the minimization of the minimum values of the maximum DMF(min.max.DMF). Employing the defined criterion and the genetic algorithm(GA), in the frequency domain, the normalized acceleration feedback gain factor and mass ratio are then carried out on the optimum parameters and effectiveness of EHATMD in reducing the structural displacement response. Furthermore, for the purpose of a comparison, the optimum results of HATMD are also taken into consideration.(3) In order to further study the sensitivity of the performance of EHATMD to changes of the structural frequency, four kinds of structural frequency changes are taken into consideration. Through scrutinizing the changes in the DMF of the structure and the larger and smaller mass block of EHATMD, the robustness of EHATMD. Additionally, for the purpose of a comparison, the optimum results of HATMD and ATMD are also taken into account.Based on the above(1) and(2) studies, it is found that EHATMD has significantly smaller stroke and better effectiveness and robustness. Therefore, EHATMD may be regarded as an important reference for structural vibration control engineering practices.