Adaptive Feedback–Feedforward Control of Building Structures
Publication: Journal of Engineering Mechanics
Volume 130, Issue 7
Abstract
This paper proposes a combined feedback–feedforward control algorithm for reducing structural response of buildings to seismic excitations. The controller contains both feedback and feedforward components. The feedback component is assumed to be the same as that found from traditional linear quadratic regulator design. The feedforward component is obtained by estimating the external excitation as a series of step functions at each time increment. This feedforward gain varies with the duration of the step function used for estimation and converges as the time duration increases. Thus, a finite number of precalculated gains can be used to represent the potential feedforward gain profile. At any instant in time, the excitation is measured and by using the past measurements, the most effective feedforward gain for the recorded excitation values can be selected from the set of precalculated gains. This value is used as the feedforward gain for the current time step. Numerical examples are presented to show the effectiveness of this adaptive control scheme. The effects of varying the control objectives, the updating time for the feedforward gain, and the number and location of actuators are studied.
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Published In
Journal of Engineering Mechanics
Volume 130 • Issue 7 • July 2004
Pages: 786 - 793
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jan 29, 2003
Accepted: Dec 23, 2003
Published online: Jun 15, 2004
Published in print: Jul 2004
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