Author

W. C. Lee

Date of Award

3-1991

Document Type

Thesis

Degree Name

Master of Science in Astronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Bradley S. Liebst, PhD

Abstract

This thesis compares the performance and robustness of colocated and non-colocated sensor/actuator pairs. Linear quadratic Gaussian and loop transfer recovery (LOG/LTR) procedures are used to design optimum controllers for three example problems. The first example is a single motion degree-of-freedom system having motion only about one axis. This type of system does not have any right half plane zeros for the non-colocated case; however, the thesis shows it behaves as a non minimum phase system. The second example is a Bernoulli-Euler beam which does not have RHP zeros. An optimum LOG/LTR controller can not improve the robustness of non minimum phase systems; whereas, colocated systems are easy to stabilize and make robust with LTR. However, this thesis shows that non colocated systems can achieve higher bandwidth and performance. So, each system has its own advantage.

AFIT Designator

AFIT-GA-ENY-91M-01

DTIC Accession Number

ADA238457

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