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Modern Anti-windup Synthesis by Andrew R. Teel, Luca Zaccarian

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Chapter One

 

 

The Windup Phenomenon and Anti-windup Illustrated

1.1 INTRODUCTION

Every control system actuator has limited capabilities. A piezoelectric stack actuator cannot traverse an unlimited distance. A motor cannot deliver an unlimited force or torque. A rudder cannot deflect through an unlimited angle. An amplifier cannot produce an unlimited voltage level. A hydraulic actuator cannot change its position arbitrarily quickly. These actuator limitations can have a dramatic effect on the behavior of a feedback control system.

In this book, the term “windup” refers to the degradation in performance that occurs when a saturation nonlinearity is inserted, at the plant input, in an otherwise linear feedback control loop. Usually the term ...

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