Finite‐dimensional approximation for optimal fixed‐order compensation of distributed parameter systems
作者:
Dennis S. Bernstein,
I. Gary Rosen,
期刊:
Optimal Control Applications and Methods
(WILEY Available online 1990)
卷期:
Volume 11,
issue 1
页码: 1-20
ISSN:0143-2087
年代: 1990
DOI:10.1002/oca.4660110102
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Finite‐dimensional compensation;Distributed parameter systems;Optimal control
数据来源: WILEY
摘要:
AbstractIn controlling distributed parameter systems it is often desirable to obtain low‐order, finite‐dimensional controllers in order to minimize real‐time computational requirements. Standard approaches to this problem employ model/controller reduction techniques in conjunction with LQG theory. In this paper we consider the finite‐dimensional approximation of the infinite‐dimensional Bernstein/Hyland optimal projection theory. Our approach yields fixed‐finite‐order controllers which are optimal with respect to high‐order, approximating, finite‐dimensional plant models. We illustrate the technique by computing a sequence of first‐order controllers for one‐dimensional, single‐input/single‐output parabolic (heat/diffusion) and hereditary systems using a spline‐based, Ritz‐Galerkin, finite element approximation. Our numerical studies indicate convergence of the feedback gains with less than 2% performance degradation over full‐order LQG controllers for the parabolic system and 10% degrad
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