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Actuator saturation is probably the most frequent nonlinearity encountered in control applications. Input saturation leads to controller windup, removable by structural modification during compensator realization and plant windup which calls for additional dynamics. Peter Hippe presents solutions to the windup prevention problem for stable and unstable single-input-single-output and multiple-input-multiple-output (MIMO) systems. The solutions use only standard tools for the investigation of linear systems – state equations, transfer functions, etc. The stability tests are based on well-known criteria for loops consisting of a linear part with isolated sector-type nonlinearity. Less rigorous "engineering solutions" which guarantee improved performance but without strict proof of stability are also demonstrated. MIMO systems in which the behaviour of controlled variables is decoupled require specific input vectors and so also suffer problems of directionality when their input signals saturate. This can have extremely deleterious consequences for closed-loop behaviour. Windup in Control offers an exact solution to this directionality problem for stable and unstable systems. The methods laid out in this survey also integrate solutions for applications with rate-constrained actuators and for bumpless transfer from manual to automatic during system start-up or in override control. Developments in control methods are always supplemented by easily repeated numerical examples. Academics doing control-related research in electronics, mechanics, or mechatronics and engineers working in the process industries will find this book an extremely useful overview of systematic windup prevention for all kinds of systems. It also has valuable insights to offer the graduate student of control. Advances in Industrial Control aims to report and encourage the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.

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Design of Observer-based Compensators presents the frequency domain design of observer-based controllers in complete correspondence to well-known time domain results and gives connecting relations at every design stage. This facilitates and adds transparency to the design in the frequency domain which is not as well-established among control engineers as time-domain design. The presentation of the design procedures starts with a short review of the time domain results; therefore, the book also provides quick access to state space methods for control system design. The frequency domain design of observer-based compensators of all orders from the full-order to the completely reduced-order compensator is covered. The design of decoupling and disturbance rejecting controllers is presented. Furthermore, solutions are given to the linear quadratic and the model matching problems. The pole assignment is facilitated by a new parametric approach which is formulated directly in the frequency domain. Anti-windup control is also investigated in the framework of the polynomial approach. Though mainly continuous-time systems are considered, the discrete-time results for disturbance rejection and linear quadratic control are also presented. The monograph contains worked examples that can easily be reproduced by the reader, and the results are illustrated by simulations. Design of Observer-based Compensators will be of use as a reference for control engineers, graduate students and researchers who are familiar with the time domain design and who want to become acquainted with the frequency domain design using polynomial matrices.

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