ABSTRACT
The so-called servomechanism problem is one of themost basic problems to occur in the field of automatic control, and it arises in almost all application problems of the aerospace and process industries. In the servomechanismproblem, it is desired to design a controller for a plant (or “system”) so that the outputs of the plant are independent, asmuch as possible, fromdisturbances whichmay affect the system (i.e., regulation occurs), and also such that the outputs asymptotically track any specified reference input signals applied to the system (i.e., tracking occurs), subject to the requirements of maintaining closed-loop system stability.
