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STABILITY AND CONVERGENCE OF PARALLE...
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KREUTZ, KENNETH KEITH.
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STABILITY AND CONVERGENCE OF PARALLEL ADAPTIVE REGULATORS: TOWARDS A ROBUST PERSPECTIVE (IDENTIFICATION, UNCERTAIN, CONTROL, BAYESIAN, LEARNING).
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
STABILITY AND CONVERGENCE OF PARALLEL ADAPTIVE REGULATORS: TOWARDS A ROBUST PERSPECTIVE (IDENTIFICATION, UNCERTAIN, CONTROL, BAYESIAN, LEARNING)./
作者:
KREUTZ, KENNETH KEITH.
面頁冊數:
267 p.
附註:
Source: Dissertation Abstracts International, Volume: 46-02, Section: B, page: 0624.
Contained By:
Dissertation Abstracts International46-02B.
標題:
Engineering, System Science. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8509091
STABILITY AND CONVERGENCE OF PARALLEL ADAPTIVE REGULATORS: TOWARDS A ROBUST PERSPECTIVE (IDENTIFICATION, UNCERTAIN, CONTROL, BAYESIAN, LEARNING).
KREUTZ, KENNETH KEITH.
STABILITY AND CONVERGENCE OF PARALLEL ADAPTIVE REGULATORS: TOWARDS A ROBUST PERSPECTIVE (IDENTIFICATION, UNCERTAIN, CONTROL, BAYESIAN, LEARNING).
- 267 p.
Source: Dissertation Abstracts International, Volume: 46-02, Section: B, page: 0624.
Thesis (Ph.D.)--University of California, San Diego, 1985.
Parallel adaptive regulators, such as the Multiple Model Adaptive Controller, have long been promoted as a practical way to regulate uncertain systems, primarily because of the belief that such regulators will learn a correct model via convergence of a posteriori probabilities. In this dissertation a theoretical framework is developed which provides an understanding of such regulators give stable and/or learning control. The issues of convergence, i.e. learning, and of stability are separated since if learning can be shown to occur under realistic and possibly unstable closed-loop operating conditions, a convergence-based stability analysis is possible.Subjects--Topical Terms:
1018128
Engineering, System Science.
STABILITY AND CONVERGENCE OF PARALLEL ADAPTIVE REGULATORS: TOWARDS A ROBUST PERSPECTIVE (IDENTIFICATION, UNCERTAIN, CONTROL, BAYESIAN, LEARNING).
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Source: Dissertation Abstracts International, Volume: 46-02, Section: B, page: 0624.
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Parallel adaptive regulators, such as the Multiple Model Adaptive Controller, have long been promoted as a practical way to regulate uncertain systems, primarily because of the belief that such regulators will learn a correct model via convergence of a posteriori probabilities. In this dissertation a theoretical framework is developed which provides an understanding of such regulators give stable and/or learning control. The issues of convergence, i.e. learning, and of stability are separated since if learning can be shown to occur under realistic and possibly unstable closed-loop operating conditions, a convergence-based stability analysis is possible.
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Generally the assumptions which are made to enable construction of posterior probabilities are in error and one is concerned with the convergence of pseudo probabilities. Such convergence is an important issue in adaptive (Bayesian) estimation. Using a Prediction Error approach and the Martingale Convergence Theorem as pioneered by Ljung, it is shown that appropriately constructed pseudo probabilities can converge to pick out a model even when signals can grow without bound and even when no model accurately describes the plant of interest. This work can be considered a logical extension of that of Anderson, Moore, and Hawkes particularly since the need for finite power signals is removed.
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The model learned by the pseudo probabilities considered here generally provides smallest one-step ahead prediction errors. Asking when such a learned model is appropriate for regulator design, answers are given for some important special cases. A robustness perspective based on the work of Doyle, Stein, and others is the key to constructing a framework within which parallel adaptive controllers are well posed when every model gives an incorrect plant description. Assuming the existence of a stabilizing (not error-free) model, it is shown that if this model is learned, then stability of parallel adaptive regulators follows. An example is given which shows the effectiveness of our approach to understanding convergence and stability issues and which demonstrates the need for a robustness based approach both in the choice of the admissible models and in LQG regulator design.
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