An output feedback flight control based on integral-type optimal servomechanism

This paper describes a design method of an output and/or error signal feedback controller for a single-input-single-output plant based on integral-type optimal servomechanism. The obtained closed-loop control system has as sufficient stability margins and good control performance as a state feedback one with an observer. Particularly the resultant controller for a second-order delay plant becomes exactly a typical I-PD (proportional-derivative preceded integral) one. This feature motivated us to reduce the order of an original plant to second based on the v-gap metric, and then design an I-PD controller. Simulation studies demonstrate the effectiveness and usefulness of the proposed method.