Robust stability of iterative learning control schemes
Abstract
A notion of robust stability is developed for iterative learning control in the context of disturbance attenuation. The size of the unmodelled dynamics is captured via a gap distance, which in turn is related to the standard ℋ︁2 gap metric, and the resulting robustness certificate is qualitatively equivalent to that obtained in classical robust ℋ︁∞ theory. A bound on the robust stability margin for a specific adaptive ILC design is established. Copyright © 2007 John Wiley & Sons, Ltd.