Accession Number : ADP003398

Title :   Design and Robustness Analysis of Reduced Order Controllers for Large Flexible Space Vehicles,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Banda,S. S. ; Ridgely,D. B. ; Yeh,H. H. ; Palmer,D. V.

Report Date : JAN 1984

Pagination or Media Count : 25

Abstract : In the control design of a large flexible space vehicle, a finite element model is truncated and the control system is designed on the basis of the reduced order model. This paper discusses the step - by - step application of frequency-shaped Linear - Quadratic - Gaussian methodology, as well as payoffs and cost of this method. The procedure for choosing and forming both state and control frequency - weightings is shown. Treating the unmodelled dynamics of the structure as a source of plant uncertainty, stability robustness evaluation was discussed. Practical usefulness of the singular-valued closed-loop performance analysis and its possible improvement are also discussed. (Author)

Descriptors :   *Attitude control systems, *Satellite attitude, *Space systems, Space technology, Mathematical models, Flexible structures, Structural analysis, Algorithms, Computer aided design, Finite element analysis

Distribution Statement : APPROVED FOR PUBLIC RELEASE