CONTROL OF UNSTABLE SINGLE AND MULTI VARIABLE SYSTEMS gives an overview on occurrence of unstable systems, identification of transfer function models and simple methods of designing PID controllers for such systems. The controller design methods include equating coefficient method, synthesis method, IMC method, pole placement method, stability analysis method, model reference method and two degree of freedom controller method. Several examples are given to illustrate these methods. Methods for the calculation of set point weighting parameter to improve the servo response of the controller and identification of unstable transfer function model by closed loop reaction curve method and optimization method are discussed in detail with the help of case studies alongwith the methods of designing decentralised PID controllers, centralised PID controllers and the methods to evaluate performance, stability and robustness of the controller.

• • Student exercise problems are given at the end of chapters. This book can be used for single semester course in masters program and is also useful for researchers and control engineers.

Preface / Acknowledgements / Design of PID Controllers for stable systems / Occurrence of unstable systems / Equating coefficient method of tuning PI/PID controllers / Synthesis method and IMC method / Pole placement method and stability analysis method / Two Degrees of Freedom controller / Identification of transfer function model / Interaction analysis and design of controllers for Multi-variable systems / Multivariable PI control of unstable systems / Simple Decoupled ETFs and Simplified Decoupler / Design of PI controllers with decouplers for unstable TITO systems / Appendixes / References / Index.

Under & Postgraduate Students, Professionals & Teachers