Date of Award

12-1991

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Electrical and Computer Engineering

First Advisor

Peter S. Maybeck, PhD

Abstract

The development and performance of moving-bank multiple model adaptive estimation (MMAE) and control (MMAC) algorithms for quelling vibrations induced in the SPICE 2 space structure are analyzed in this thesis. The structure consists of a large platform and a smaller platform connected by three legs in a tripod fashion. The model supplied by Phillips Laboratory, Kirtland AFB is used to develop a truth model and multiple reduced ordered filter models. The filter models are developed from modal analysis and internally balanced techniques. Deviations of the line-of-sight vector from the center of the large platform to the center of the smaller platform are used for LQG controller performance evaluation. For use with the LQG controller, research results indicate the chosen reduced order models are of inadequate dimension and that the full ordered filter model should be implemented to quell vibrations introduced into the structure. The parameter estimator implemented the ME/I algorithm, the moving-bank logic employed parameter position monitoring and the controller used the modified MMAC method. Parameter variations of two percent caused instabilities in the single filter/controller design. The MMAE/MMAC algorithms provide an excellent method to estimate a wide range of parameter variations and to quell oscillations in the structure.

AFIT Designator

AFIT-GE-ENG-91D-22

DTIC Accession Number

ADA243759

Comments

The author's Vita page is omitted.

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