Modern Control Engineering

Modern Control Engineering
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Modern Control Engineering

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Publisher: Sanguine Publications
ISBN: 9789383506514
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PREFACE TO FIRST EDITION
Since the early days of teaching and learning of Control and Systems Theory in our Universities, the subject has evolved considerably. In the sixties when the author graduated in Engineering, Control Theory was taught as a part of a course in Applied or Industrial Electronics whereas now, at least two courses in Control Theory are being offered in most of the undergraduate programmes. While several text books from foreign and Indian authors and publishers are available for the rst course in Control, there are very few text books available for the second course in Control Theory which includes something of everything in Advanced Control Theory. It is expected that this book will ll this gap for such a course. The material discussed in the book has been tested in the class rooms by the author for at least two decades and it is hoped that the book will be useful for students, teachers and practising professionals as a ready reference. Every effort has been made to bring out the practical and conceptual aspects of Control Systems Engineering rather than have a purely mathematical approach as usually given in many books. Personally, the author has taken up learning Control and Systems theory as a challenge as early as 1968 when he graduated in Electrical Engineering and the book is the sum total of his understanding on the advanced topics in Control. The book is divided into ten chapters with the rst chapter being a very brief introduction to classical control theory. The second chapter gives the classical design techniques using Bode plots and root locus technique. Analysis of discrete time systems is presented in Chapter 3 using z-transforms. Chapters 4, 5 and 6 deal with state space modelling, solution of state equation and design of control systems using state space model with a glimpse on the design of observers, and state feedback controllers. Chapters 7and 8 deal with nonlinear systems, the former on phase plane analysis and the latter on describing function method. Even though both these methods were developed long time back, these methods are still useful to get some insight into the behaviour of nonlinear systems. Chapter 9 discusses in depth the Lyapunov s method for stability analysis of systems and Chapter 10 is a brief introduction to concepts and methods of optimal control. Several worked examples and a summary points to remember have been added in each chapter. A set of multiple choice v
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vi
Preface
questions has been added at the end of the book useful for students in the preparation for objective type tests and answers to additional numerical problems have been provided. MATLAB software package developed by mathworks Inc. is a very useful simulation software for the study of control systems. An introduction to the software package is given in Appendix. It is sincerely hoped that the students and teachers in several universities in our country will nd this book useful as a text book for the second course in Control Systems Engineering. The author wishes to acknowledge the encouragement and facilities provided by Former Director in-charge Dr. B.N. Nagaraj, National Institute of Technology, Calicut and the present Director Dr. G.R.C. Reddy, National Institute of Technology, Calicut. The large number of students whom I have taught and the feedback from them is the inspiration behind this effort and I am truly grateful to them. Dr. K. P. Mohandas
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