Adaptive Control Techniques for Large Space Structures.
Annual technical rept. 1 Jun 84-31 May 85,
INTEGRATED SYSTEMS INC PALO ALTO CA
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The Large Space Structure LSS research program was originally formulated in late 1982 in response to the increasing concern that performance robustness of Air Force LSS type systems would be inadequate to meet mission objectives. In particular, 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, the use of an adaptive system, where disturbances andor 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. As has been noted by Astrom recent advances in each of these fronts have brought us to the position where adaptive control has bee applied to many processes and standard adaptive controllers can be purchased, e.g., Egardt 1984.
- Unmanned Spacecraft