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Design of Fixed Gain Compensator System for the Longitudinal Axis of the C-141 Fly-by-Wire Aircraft.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The report presents an attempt to design a fixed gain control system for the longitudinal axis of the C-141 fly-by-wire aircraft. Classical control theory using root locus and frequency response Bode techniques was used throughout the design process. It was found that a quadratic over quadratic compensator, inserted in the forward path of the C control loop, improved the system response even with the original discrete gains. With slightly relaxed constraints on the C performance envelope was originally designed for fighter aircraft, a single fixed gain in the C loop produced acceptable C Category 3 responses. An additional quadratic over quadratic compensator was designed for the pitch attitude control loop however, the acceptability of the attitude response with a fixed gain is questionable. Modified author abstract
APPROVED FOR PUBLIC RELEASE