Gain-Scheduled Adaptive Control for Seismically Excited Hybrid Structures
Publication: Journal of Structural Engineering
Volume 127, Issue 11
Abstract
A nonlinear controller is developed using gain-scheduled adaptation for a six-story, base-isolated office building subjected to strong earthquakes. Several linearized models and a scheduled piecewise linear model of the structure are developed using a finite-element nonlinear model. Compensators are designed, based on the H∞ control design method using the linearized models. The family of designed compensators is then gain-scheduled. The selected scheduling variable is a combination of the interstory ductility and the measured earthquake magnitude. The performance and robustness of the gain-scheduled adaptive controller is extensively studied for a variety of earthquake records and uncertainties, ranging from structure parameter variations to controller hardware-related time delays. All controller simulations are performed using the detailed finite-element nonlinear structure model. A key advantage of the gain-scheduled adaptive controller, compared to a constant-gain controller, is the reduction of up to 40% in the applied control forces while maintaining the same closed-loop performance.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 127 • Issue 11 • November 2001
Pages: 1286 - 1294
History
Received: Apr 7, 2000
Published online: Nov 1, 2001
Published in print: Nov 2001
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