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Robust Control: The Parametric Approach/Book and Disk (Prentice Hall Information and System Sciences)

Download Ebook Robust Control: The Parametric Approach/Book and Disk (Prentice Hall Information and System Sciences)

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From the Inside Flap

The subject of robust control began to receive worldwide attention in the late 1970's when it was found that Linear Quadratic Optimal Control (optimal control), state feedback through observers, and other prevailing methods of control system synthesis such as Adaptive Control, lacked any guarantees of stability or performance under uncertainty. Thus, the issue of robustness, prominent in Classical Control, took rebirth in a modern setting. Optimal control was proposed as a first approach to the solution of the robustness problem. This elegant approach, and its offshoots, such as theory, have been intensely developed over the past 12 years or so, and constitutes one of the triumphs of control theory. The theory provides a precise formulation and solution of the problem of synthesizing an output feedback compensator that minimizes the norm of a prescribed system transfer function. Many robust stabilization and performance problems can be cast in this formulation and there now exists effective, and fairly complete theory for control system synthesis subjected to perturbations, in the framework. The theory delivers an "optimal" feedback compensator for the system. Before such a compensator can be eployed in a physical (real-world) system it is natural to test its capabilities with regard to additional design criteria, not covered by the optimality criterion used. In particular the performance of any controller under real parameter uncertainty, as well as mixed parametric-unstructured uncertainty, is an issue which is vital to most control systems. However, optimal theory is incapable of providing a direct and nonconservative answer to this important question. The problem of robustness under parametric uncertainty received a shot in the arm in the form of Kharitonov's Theorem for interval polynomials, which appeared in the mid-1980's in the Western literature. It was originally published in 1978 in a Russian journal. With this surprising theorem the entire field of robust control under real parametric uncertainty came alive and it can be said that Kharitonov's Theorem is the most important occurrence in this area after the development of the Routh-Hurwitz criterion. A significant development following Kharitonov's Theorem was the calculation, in 1985, by Soh, Berger and Dabke of the radius of the stability ball in the space of coefficients of a polynomial. From the mid-1980's rapid and spectacular developments have taken place in this field. As a result we now have a rigorous, coherent, and comprehensive theory to deal directly and effectively with real parameter uncertainty in control systems. This theory nicely complements the optimal theories as well as Classical Control and considerably extends the range of possibilities available to the control specialist. The main accomplishment of this theory is that it allows us to determine if a linear time invariant control system, containing several uncertain real parameters remains stable as the parameters vary over a set. This question can be answered in a precise manner, that is, nonconservatively, when the parameters appear linearly or multilinearly in the characteristic polynomial. In developing the solution to the above problem, several important control system design problems are answered. These are 1) the calculation of the real parametric stability margin, 2) the determination of stability and stability margins under mixed parametric and unstructured (norm-bounded or nonlinear) uncertainty 3) the evaluation of the worst case or robust performance measured in the norm, over a prescribed parametric uncertainty set and 4) the extension of classical design techniques involving Nyquist, Nichols and Bode plots and root-loci to systems containing several uncertain real parameters. These results are made possible because the theory developed provides built-in solutions to several extremal problems. It identifies apriori the critical subset of the uncertain parameter set over which stability or performance will be lost and thereby reduces to a very small set, usually points or lines, the parameters over which robustness must be verified. This built-in optimality of the parametric theory is its main strong point particularly from the point of view of applications. It allows us, for the first time, to devise methods to effectively carry out robust stability and performance analysis of control systems under parametric and mixed uncertainty. To balance this rather strong claim we point out that a significant deficiency of control theory at the present time is the lack of nonconservative synthesis methods to achieve robustness under parameter uncertainty. Nevertheless, even here the sharp analysis results obtained in the parametric framework can be exploited in conjunction with synthesis techniques developed in the framework to develop design techniques to partially cover this drawback. The objective of this book is to describe the parametric theory in a self-contained manner. The book is suitable for use as a graduate textbook and also for self-study. The entire subject matter of the book is developed from the single fundamental fact that the roots of a polynomial depend continuously on its coefficients. This fact is the basis of the Boundary Crossing Theorem developed in Chapter 1 and is repeatedly used throughout the book. Surprisingly enough this simple idea, used systematically is sufficient to derive even the most mathematically sophisticated results. This economy and transparency of concepts is another strength of the parametric theory. It makes the results accessible and appealing to a wide audience and allows for a unified and systematic development of the subject. The contents of the book can therefore be covered in one semester despite the size of the book. In accordance with our focus we do not develop any results in theory although some results from theory are used in the chapter on synthesis. In Chapter 0, which serves as an extension of this preface, we rapidly overview some basic aspects of control systems, uncertainty models and robustness issues. We also give a brief historical sketch of Control Theory, and then describe the contents of the rest of the chapters in some detail. The theory developed in the book is presented in mathematical language. The results described in these theorems and lemmas however are completely oriented towards control systems applications and in fact lead to effective algorithms and graphical displays for design and analysis. We have throughout included examples to illustrate the theory and indeed the reader who wants to avoid reading the proofs can understand the significance and utility of the results by reading through the examples. A MATLAB based software package, the Robust Parametric Control ToolBox, has been developed by the authors in collaboration with Samir Ahmad, our graduate student. It implements most of the theory presented in the book. In fact, all the examples and figures in this book have been generated by this ToolBox. We gratefully acknowledge Samir's dedication and help in the preparation of the numerical examples given in the book. A demonstration diskette illustrating this package is included with this book. S.P.B. would like to thank R. Kishan Baheti, Director of the Engineering Systems Program at the National Science Foundation, for supporting his research program. L.H.K. thanks Harry Frisch and Frank Bauer of NASA Goddard Space Flight Center and Jer-Nan Juang of NASA Langley Research Center for their support of his research, and Mike Busby, Director of the Center of Excellence in Information Systems at Tennessee State University for his encouragement. It is a pleasure to express our gratitude to several colleagues and coworkers in this field. We thank Antonio Vicino, Alberto Tesi, Mario Milanese, Jo W. Howze, Aniruddha Datta, Mohammed Mansour, J. Boyd Pearson, Peter Dorato, Yakov Z. Tsypkin, Boris T. Polyak, Vladimir L. Kharitonov, Kris Hollot, Juergen Ackermann, Diedrich Hinrichsen, Tony Pritchard, Dragoslav D. Siljak, Charles A. Desoer, Soura Dasgupta, Suhada Jayasuriya, Rama K. Yedavalli, Bob R. Barmish, Mohammed Dahleh, and Biswa N. Datta for their, support, enthusiasm, ideas and friendship. In particular we thank Nirmal K. Bose, John A. Fleming and Bahram Shafai for thoroughly reviewing the manuscript and suggesting many improvements. We are indeed honored that Academician Ya. Z. Tsypkin, one of the leading control theorists of the world, has written a Foreword to our book. Professor Tsypkin's pioneering contributions range from the stability analysis of time-delay systems in the 1940's, learning control systems in the 1960's to robust control under parameter uncertainty in the 1980's and 1990's. His observations on the contents of the book and this subject based on this wide perspective are of great value. The first draft of this book was written in 1989. We have added new results of our own and others as we became aware of them.

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From the Back Cover

Crucial in the analysis and design of control systems, this book presents a unified approach to robust stability theory, including both linear and nonlinear systems, and provides a self-contained and complete account of the available results in the field of robust control under parametric uncertainty. These results are elegant and their direct application to control system design is illustrated by numerous examples, including MATLAB software. Covers the Generalized Kharitonov Theorem, the theory of disk polynomials, the extremal properties of interval systems, the calculation of the real parametric stability margin, and design problems under simultaneous parametric and nonparametric uncertainty. For electrical, mechanical, nuclear, chemical, and aerospace engineers.

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Product details

Series: Prentice Hall Information and System Sciences

Hardcover: 672 pages

Publisher: Prentice Hall; Har/Dskt edition (January 1, 1995)

Language: English

ISBN-10: 013781576X

ISBN-13: 978-0137815760

Product Dimensions:

7.5 x 1.2 x 9.8 inches

Shipping Weight: 2.6 pounds

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Amazon Best Sellers Rank:

#2,126,102 in Books (See Top 100 in Books)

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