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Tytuł: Iterative learning control for over-determined, under-determined, and ill-conditioned systems

Autor:

Avrachenkov, Konstantin E. ; Longman, Richard W.

Data wydania:

2003

Typ zasobu:

artykuł

Współtwórca:

Gałkowski, Krzysztof - ed. ; Longman, Richard W. - ed. ; Rogers, Eric - ed.

Podtytuł:

Multidimensional Systems nD and Iterative Learning Control

Tytuł publikacji grupowej:

AMCS, volume 13 (2003)

Abstract:

This paper studies iterative learning control (ILC) for under-determined and over-determined systems, i.e., systems for which the control action to produce the desired output is not unique, or for which exact tracking of the desired trajectory is not feasible. For both cases we recommend the use of the pseudoinverse or its approximation as a learning operator. ; The Tikhonov regularization technique is discussed for computing the pseudoinverse to handle numerical instability. It is shown that for over-determined systems, the minimum error is never reached by a repetition invariant learning controller unless one knows the system exactly. ; For discrete time uniquely determined systems it is indicated that the inverse is usually ill-conditioned, and hence an approximate inverse based on a pseudoinverse is appropriate, treating the system as overdetermined. Using the structure of the system matrix, an enhanced Tikhonov regularization technique is developed which converges to zero tracking error. ; It is shown that the Tikhonov regularization is a form of linear quadratic ILC, and that the regularization approach solves the important practical problem of how to intelligently pick the weighting matrices in the quadratic cost. It is also shown how to use a modification of the Tikhonov-based quadratic cost in order to produce a frequency cutoff. This robustifies good learning transients, by reformulating the problem as an over-determined system.

Wydawca:

Zielona Góra: Uniwersytet Zielonogórski

Identyfikator zasobu:

oai:zbc.uz.zgora.pl:59025

Strony:

113-122

Źródło:

AMCS, volume 13, number 1 (2003) ; kliknij tutaj, żeby przejść

Jezyk:

eng

Prawa do dysponowania publikacją:

Biblioteka Uniwersytetu Zielonogórskiego

Temat i słowa kluczowe:

iterative learning control over-determined under-determined ill-conditioned systems pseudoinverse

Kolekcje, do których przypisany jest obiekt:

Data ostatniej modyfikacji:

2021-10-18

Data dodania obiektu:

2021-10-14

Liczba wyświetleń treści obiektu:

51

Wszystkie dostępne wersje tego obiektu:

https://zbc.uz.zgora.pl/publication/65885

Wyświetl opis w formacie RDF:

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Wyświetl opis w formacie OAI-PMH:

OAI-PMH

Nazwa wydania Data
Iterative learning control for over-determined, under-determined, and ill-conditioned systems 2021-10-18

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(+48) 68 328 21 55

E-Mail

kontakt@zbc.uz.zgora.pl

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