Adaptive Control Techniques for Large Space Structures.
Abstract
The Large Space Structure (LSS) research program was originally formulated in response to increasing concern that performance robustness of Air Force LSS systems would be inadequate to meet mission objectives. Uncertainties in both system dynamics and disturbance spectra characterizations (both time varying and stochastic uncertainty) significantly limit the performance attainable with fixed gain, fixed architecture controls. Therefore, use of an adaptive system, where disturbances and/or plant models are identified prior to or during control, gives systems designers more options for minimizing the risk in achieving performance objectives. The aim of adaptive control is to implement in real time and on line as many as possible of the design functions now performed off line by the control engineer to give the controller 'intelligence.' To realize this aim, both a theory of stability and performance of such inherently nonlinear controls is essential as well as a technology capable of achieving the implementation. The present research concentrated on: (1) on line robust design from identified models - what is referred to here as adaptive calibration; and (2) an analysis of slow-adaptation for adaptive control for LSS. Appendices include articles on the following topics: Methods of averaging for adaptive systems, Transient analysis of adaptive control, Fixed-point theorems for stability analysis of adaptive systems, and Stability theory for adaptive systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1986
- Accession Number
- ADA173083
Entities
People
- Michael G. Lyons
- Robert L. Kosut