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MODEL REFERENCE PARAMETRIC ADAPTIVE ITERATIVE LEARNING control

IFAC Proceedings Volumes 2002年第1期35卷 469-474页

作者： H. Yu M. Deng T.C. Yang D.H. Owens School of Engineering and Computer Science Exeter University Exeter EX4 4QF School of Engineering and Information Technology Sussex University Brighton BN1 9QT Department of Automatic Control and Systems Sheffield University Sheffield S1 3JD

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust n m + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method.

关键词： Iterative learning control Adaptive control Strictly positive real Model reference control

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IMPLEMENTATION OF CONSTRAINED PREDICTIVE OUTER-LOOP controlLERS: APPLICATION TO A BOILER control SYSTEM

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IFAC Proceedings Volumes 2002年第1期35卷 145-150页

作者： Fernando Tadeo Teresa Alvarez Mike Grimble Ramon Vilanova Departamento de Ingenieria de Sistemas y Automática Facultad de Ciencias. Universidad de Valladolid. 47011 Valladolid Spain Tlf:+34 983 423566 Fax:+34 983 423161 Industrial Control Centre Strathclyde University United Kingdom Automatic Control and Systems Engineering Group Dept. of Computer Science Universitat Autonoma de Barcelona 08193 Bellaterra – Barcelona Spain

This paper addresses the problem of implementing predictive controllers for supervisory level control systems. In this configuration the manipulated variables calculated by the Predictive controller are used as command signals for the Distributed control systems, which provide references to the operator-tuned local PID controllers that act on the physical system. This structure introduces the problem of loosing of performance if the inner-loop controllers are re-tuned. The paper discusses the solution to this problem based on the use of a two-degrees-of-freedom structure in the inner loop, that separates open and closed-loop properties. Both design guidelines and robustness issues are discussed.

关键词： Supervisory control Predictive control

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POSITIVE REALNESS AND THE ANALYSIS OF A CLASS OF 2D LINEAR systems

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IFAC Proceedings Volumes 2002年第1期35卷 219-224页

作者： K. Galkowski W. Paszke B. Sulikowski E. Rogers S. Xu J. Lam Z. Lin D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Departament of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada T6G 2V4 Department of Mechanical Engineering University of Hong Kong School of EEE Nanyang Technological University Nanyang Ave. 639798 Singapore Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting and metal rolling operations through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two independent directions only occurs over a finite duration. This, in turn, means that a distinct systems theory must be developed for them, which can then be translated into efficient routinely applicable controller design algorithms for applications domains. In this paper, we give the first significant results on a positive realness based approach to the analysis of these processes.

关键词： 2D linear systems repetitive processes positive realness

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Intelligent assumption retrieval from process models by model-based reasoning 1

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14th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert systems, IEA/AIE 2001

作者： Lakner, R. Hangos, K.M. Dept. of Computer Science University of Veszprém Veszprém Hungary Systems and Control Laboratory Computer and Automation Research Institute HAS Budapest Hungary

ISBN: (数字)9783540455172

ISBN: (纸本)3540422196

Process models can be seen as structured knowledge base elements with syntax and semantics dictated by the underlying physical and chemical laws. The effect of model simplification assumptions is then determined by forward reasoning in order to take into account all of their implications. A bidirectional reasoning method for the retrieval of modelling assumptions from two related process models is proposed. An intelligent model editor is constructed to perform and test the model-based reasoning methods related to the assumption retrieval. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Semantics

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Applications of coordinate logic filters in image analysis and pattern recognition

Applications of coordinate logic filters in image analysis a...

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International Symposium on Image and Signal Processing and Analysis

作者： B.G. Mertzios K. Tsirikolias Automatic Control Systems Laboratory Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece

ISBN: (纸本)9539676940

The paper presents a number of image processing and pattern recognition applications using coordinate logic filters which execute coordinate logic operations among the pixels of the image. These filters are very efficient in various 1D, 2D or higher-dimensional digital signal processing applications, such as noise removal, magnification, opening, closing, skeletonization, coding, edge detection, feature extraction, and fractal modeling. The key issue in the coordinate logic analysis of images is the method of fast successive filtering and managing of the residues. The desired processing is achieved by executing only direct logic operations among the pixels of the given image. Coordinate logic filters can be easily and quickly implemented using logic circuits or cellular automata; this is their primary advantage.

关键词： Image analysis Image edge detection Pixel Logic circuits Image processing Pattern recognition Digital filters Digital signal processing Image coding Feature extraction

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Output steering using iterative learning control 6

Output steering using iterative learning control

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6th European control Conference, ECC 2001

作者： Townley, T.Y. Owens, D.H. School of Engineering and Computer Science University of Exeter ExeterEX4 4QF United Kingdom Automatic Control and Systems Engineering University of Sheffield SheffieldSI 3JD United Kingdom

ISBN: (纸本)9783952417362

A causal iterative learning control algorithm based on optimal feedback and feedforward control is derived to provide perfect tracking of selected output values at specified times. Exponential convergence of the algorithm is proved and a realization based on Riccati feedback is described. The properties of the algorithm are illustrated by example. © 2001 EUCA.

关键词： Iterative methods

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Feasibility assessment and operating policy optimization of automotive powertrains with uncertainties using game theory

Feasibility assessment and operating policy optimization of ...

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2001 ASME International Mechanical Engineering Congress and Exposition

作者： Kolmanovsky, Ilya Siverguina, Irina P/T Control Systems Department Ford Research Laboratory Dearborn MI 48124 United States Sch. of Eng. and Computer Science Rochester MI 48309 United States

The paper describes a game-theoretic framework and a computational algorithm for feasibility evaluation of automotive powertrains with storage elements in terms of fuel economy and emissions performance. The game-theoretic framework allows to handle various time-dependent uncertainties, including uncertainties in the drive cycle. In particular, an important issue in the prior approaches to this problem, the drive cycle dependence of the optimal policies, is alleviated. Within the basic framework, it is also possible to generate implementable operating policies that specify powsrtrain actuator settings as functions of engine operating conditions and states of the storage elements. We illustrate the procedure using an example poweitrain with a Direct Injection Stratified Charge engine and an aftertreatment system consisting of a Three Way Catalyst and a Lean NOx Trap.

关键词： Game theory

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A volterra operator approach to the stability analysis of a class of 2D linear systems 6

A volterra operator approach to the stability analysis of a ...

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6th European control Conference, ECC 2001

作者： Dymkov, M. Gaishun, I. Galkowski, K. Rogers, E. Owens, D.H. Institute of Mathematics National Academy of Sciences of Belarus Belarus Institute of Control and Computation Engineering Technical University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9783952417362

Repetitive processes are a distinct class of 2D systems of both practical and theoretical interest. Their essential characteristic is repeated sweeps, termed passes, through a set of dynamics defined over a finite duration with explicit interaction between the outputs, or pass profiles, produced as the process evolves. Experience has shown that these processes cannot be studied/controlled by direct application of existing theory (in all but a few very restrictive special cases). This fact, and the growing list of applications areas, has prompted an on-going research programme into the development of a 'mature' systems theory for these processes for onward translation into reliable generally applicable controller design algorithms. It has long been considered that Volterra operator techniques should have a key role to play in this general area. In this paper, we first present the necessary properties of a Volterra operator representation for the very important sub-class of so-called discrete linear repetitive processes and then use them to develop a characterization of stability in this setting. © 2001 EUCA.

关键词： Linear systems

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A 2D systems approach to iterative learning control based on nonlinear adaptive control techniques

A 2D systems approach to iterative learning control based on...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： M. French E. Rogers H. Wibowo D.H. Owens Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780366859

We consider the iterative learning control problem from a 2D systems/adaptive control viewpoint. In particular, it is shown how some fundamental results from nonlinear adaptive control can be successfully applied in the iterative learning control domain under very weak assumptions. Some areas for further research are also briefly discussed.

关键词： Iterative methods Nonlinear control systems control systems Adaptive control automatic control Iterative algorithms computer science systems engineering and theory Robots Manipulators

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On some aspects of discrete equivalents of differential linear repetitive processes

On some aspects of discrete equivalents of differential line...

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IEEE Conference on Decision and control

作者： J. Gramacki A. Gramacki K. Galkowski E. Rogers D.H. Owens Department of Electronics and Computer Science University of Zielona Góra Poland Department of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

ISBN: (纸本)0780370619

Differential linear repetitive processes are a distinct sub-class of 2D continuous-discrete linear systems which pose problems that cannot (except in a few very restrictive special cases) be solved by the direct application of standard (1D) systems theory and hence by the direct use of a large number of currently-available tools for computer-aided analysis/design. One such area is the construction of discrete approximations to their dynamics. In this paper, we investigate some problems which arise during the discretization of differential linear repetitive processes and develop solutions to them.

关键词： computer science Linear systems computer aided analysis Orbital robotics Robotics and automation Software engineering automatic control systems engineering and theory Stability

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