Abstract
This paper lies in the framework of a parametric numerical analysis of the efficiency of active mass dampers (AMDS), focusing on the influence of time delays. Such a lag time is contributed by all the elements in the control loop but is mostly due to the physical inertia of the actuators; consequently, since mass dampers are massive, time delays can be significant for AMDS. The time evolution of the system is simulated by means of a difference equation describing the digital control loop. Active control forces are calculated using a predictive control strategy in whose formulation the time delays in the actuators have been included. To summarize and quantify the results of the control action, eight dimensionless performance indices are defined. Such indices provide extended information about the control effects. Initial results presented in this paper show that (i) an active system (AMD) can be more effective than a passive one (TMD) and (ii) time delays may deteriorate the performance of the control loop if they are not accounted for or if they are not properly estimated; otherwise, the control action remains useful.
Published Version
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