Journal
INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING
Volume 27, Issue 4, Pages 280-301Publisher
WILEY-BLACKWELL
DOI: 10.1002/acs.2297
Keywords
model reference adaptive control; persistency of excitation; uncertain multivariable linear dynamical systems
Funding
- NSF [ECS-0238993]
- NASA [NNX08AD06A]
- NASA [NNX08AD06A, 103197] Funding Source: Federal RePORTER
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Concurrent learning adaptive controllers, which use recorded and current data concurrently for adaptation, are developed for model reference adaptive control of uncertain linear dynamical systems. We show that a verifiable condition on the linear independence of the recorded data is sufficient to guarantee global exponential stability. We use this fact to develop exponentially decaying bounds on the tracking error and weight error, and estimate upper bounds on the control signal. These results allow the development of adaptive controllers that ensure good tracking without relying on high adaptation gains, and can be designed to avoid actuator saturation. Simulations and hardware experiments show improved performance. Copyright (C) 2012 John Wiley & Sons, Ltd.
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