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Convergence theory for multi‐input discrete‐time iterative learning control with Coulomb friction, continuous outputs, and input bounds
Author(s) -
J. Driessen Brian,
Sadegh Nader
Publication year - 2004
Publication title -
international journal of adaptive control and signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 66
eISSN - 1099-1115
pISSN - 0890-6327
DOI - 10.1002/acs.807
Subject(s) - iterative learning control , control theory (sociology) , convergence (economics) , bounded function , scalar (mathematics) , diagonal , position (finance) , discrete time and continuous time , mathematics , computer science , control (management) , mathematical analysis , artificial intelligence , statistics , geometry , finance , economics , economic growth
In this paper we consider the problem of discrete‐time iterative learning control (ILC) for position trajectory tracking of multiple‐input, multiple‐output systems with Coulomb friction, bounds on the inputs, and equal static and sliding coefficients of friction. We present an ILC controller and a proof of convergence to zero tracking error, provided the associated learning gain matrices are scalar‐scaled with a sufficiently small positive scalar. We also show that non‐diagonal learning gain matrices satisfying the same prescribed conditions do not lead to the same convergence property. To the best of our knowledge, for problems with Coulomb friction, this paper represents a first convergence theory for the discrete‐time ILC problem with multiple‐bounded‐inputs and multiple‐outputs; previous work presented theory only for the single‐input, single‐output problem. Copyright © 2004 John Wiley & Sons, Ltd.