The book presents the design techniques which the authors found most useful in
designing control system for industry, telecommunication, and space program. It also prepares the readefro r research in the area of high-performance nonlinear controllers. Phnt and compensator. In classical control, the object of control (plant) is characterized either by its measured frequency response over the range of effective!
feedback or by a rather simple input/output
mathematical model. Classical design does not utilize the plant’s internal variables and/or their estimates for compensation, unlike the
full-state feedback approach. The appropriate loop responses are achieved by a stand-alone high-order compensator. Thesaer e the reasons this book starts with feedback, disturbance rejection, loop shaping, and compensator design, and not with extensive plant modeling. The easiest way to comprehend complex systems is to break them into building blocks. The block diagram method became standard in computer aided analysis and design. Understanding systems relies on understanding the blocks’ interaction and, particularly, on understanding the feedback. The term feedback was applied to
closed-loop system engineering .by Harold Black of The Bell Laboratoriesin the 1920s. It describes regulation processes in engineering and in biological, economical, social and
political systems - everywhere where information about the results comes back and influences the input.