Two Reconfigurable Flight-Control Design Methods: Robust Servomechanism and Control Allocation
Burken, John J. and Lu, Ping and Wu, Zhenglu and Bahm, Cathy (2001) Two Reconfigurable Flight-Control Design Methods: Robust Servomechanism and Control Allocation. Journal of Guidance, Control, and Dynamics 24(3):482-493.
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Abstract
Two methods are discussed for design of reconfigurable flight-control systems when one or more control surfaces are jammed. The first is a robust servomechanism control approach, which is a generalization of the classical proportional-plus-integral control to multi-input/multi-output systems. The second proposed method is a control-allocation approach based on a quadratic programming formulation. The formulation is formally analyzed, and a globally convergent fixed-point iteration algorithm is used to make onboard implementation of this method feasible. The two methods are applied to reconfigurable entry flight control design for the X-33 vehicle. Nonlinear six-degree-of-freedom simulations demonstrate simultaneous tracking of angle-of-attack and roll-angle commands during control surface failures. The control-allocation method appears to offer more uniform and good performance at the expense of modestly higher computation requirement.
| EPrint Type: | Journal Article (Technical) |
|---|---|
| Keywords: | Control allocation, Reconfigurable flight-control, Robust servomechanism, X-33 vehicle |
| Subjects: | (01 - 09) Aeronautics: (08) Aircraft Stability And Control Aircraft/Project: X-33 |
| ID Code: | 1831 |
| Deposited On: | 08 Febuary 2008 |
| Additional Information: | 12 pages. Burken, Bahm, NASA Dryden Flight Research Center; Lu, Wu, Iowa State University. |
