Hybrid active tuned mass dampers for structures under the ground acceleration

Abstract

Summary The hybrid active tuned mass dampers (HATMD)—a new control system—have been proposed to attenuate undesirable oscillations of structures under the ground acceleration. Based on the authors recent exploration, the performance of the active tuned mass damper (ATMD) with the negative normalized acceleration feedback gain factors (NNAFGF) scheme is better than that with the positive NAFGF (PNAFGF) scheme; therefore, the active control forces of the HATMD are generated by combined use of both the NNAFGF and PNAFGF schemes. In the light of the mode‐generalized system in the specific vibration mode being controlled (simply referred here to as the structure) and accordingly deduced formulae, the expression then is defined for the dynamic magnification factor (DMF) of the structure furnished with the HATMD. Naturally, the criterion for the optimum searching can be determined as the minimization of the minimum values of the maximum DMF. By resorting to the selected criterion and utilizing a genetic algorithm, the effects of varying the key parameters on the optimum performance of the HATMD have been scrutinized both to arrive at the parameter combinations that make it best work and to make an attempt to shed light on the particular phenomena that for it there may exist. Furthermore, for the purpose of comparison, this study simultaneously investigates the optimum performance of both the ATMD and active–passive tuned mass dampers (APTMD) employing the proposed NNAFGF scheme. It is found in terms of numerical results that the HATMD outperforms both the ATMD and APTMD. Copyright © 2014 John Wiley & Sons, Ltd.

Enhanced hybrid active tuned mass dampers for structures

“…More specifically, the changing trends of both the optimum parameters and effectiveness of EHATMD will be investigated and demonstrated through the minimization of the minimum values of the maximum dynamic magnification factors (min.min.max.DMF) of the structure equipped with EHATMD, and then, the strokes of EHATMD will be estimated in terms of the maximum DMF values of ATMD1 and ATMD2 taking their optimum parameters. Here say that the global optimization of EHATMD is taken into consideration using the genetic algorithm (GA), a metaheuristic algorithm.…”

“…In the present work, the optimization processes of EHATMD using GA may be implemented directly on MATLAB software platform via coding and invoking the built‐in functions. The flowchart of GA for finding the optimum parameters of the EHATMD and the targets and ranges of explored parameters as well as assigned parameter values are same as those in Li and Cao, with the exception of the variable ξ L . Based on the extensive simulation results, the linking damping ratio of EHATMD is set in the range of ξ L ∈ [0, 0.5] and its incremental interval is taken as 0.001.…”

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

“…Li et al [30] introduced the hybrid active TMD for structures under ground acceleration. Lin et al [31] presented the experimental verification of seismic vibration control using semi-active friction TMD.…”

Multi-objective optimal design of tuned mass dampers

“…Many applications of TMDs in tall buildings for wind mitigation have been reported in the literature (see, e.g., Soong and Dargush and Soto and Adeli), and design methodologies have been proposed (see, e.g., Venanzi). In general, as buildings are designed to respond inelastically to earthquakes, passive TMDs have not been considered a good approach for seismic damage mitigation, and active, semiactive, or nonlinear TMDs were sought (see, e.g., these studies). Recently, a good benefit from passive TMDs installed in nonlinear systems was shown as well .…”