Date of Award

12-1993

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

D. Brett Ridgely, PhD

Abstract

The purpose of this study was to investigate and describe the differences between a one-degree-of-freedom (1-DOF) controller, in which a controller is placed in a single location in the control loop, and a two-degree- of-freedom (2-DOF) controller, in which two separate controllers are designed -- one in the feedback loop and the other as a prefilter in the forward loop. The approach involved summarizing the major rules governing loop shaping for performance and robustness in the 1-DOF case and then extending the concepts to the 2-DOF case. H2 optimization was utilized to perform several types of SISO examples and one MIMO example to verify the concepts. In all cases, the 2-DOF controller exhibited superior tracking performance over a wide range of plant disturbances and measurement noises compared to the 1-DOF model.

AFIT Designator

AFIT-GAE-ENY-93D-27

DTIC Accession Number

ADA273839

Comments

The author's Vita page is omitted.

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