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Deterministic Reconfigurable Control Design for the X-33 VehicleIn the event of a control surface failure, the purpose of a reconfigurable control system is to redistribute the control effort among the remaining working surfaces such that satisfactory stability and performance are retained. Four reconfigurable control design methods were investigated for the X-33 vehicle: Redistributed Pseudo-Inverse, General Constrained Optimization, Automated Failure Dependent Gain Schedule, and an Off-line Nonlinear General Constrained Optimization. The Off-line Nonlinear General Constrained Optimization approach was chosen for implementation on the X-33. Two example failures are shown, a right outboard elevon jam at 25 deg. at a Mach 3 entry condition, and a left rudder jam at 30 degrees. Note however, that reconfigurable control laws have been designed for the entire flight envelope. Comparisons between responses with the nominal controller and reconfigurable controllers show the benefits of reconfiguration. Single jam aerosurface failures were considered, and failure detection and identification is considered accomplished in the actuator controller. The X-33 flight control system will incorporate reconfigurable flight control in the baseline system.
Document ID
19980235564
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Wagner, Elaine A.
(Lockheed Martin Corp. Palmdale, CA United States)
Burken, John J.
(NASA Dryden Flight Research Center Edwards, CA United States)
Hanson, Curtis E.
(NASA Dryden Flight Research Center Edwards, CA United States)
Wohletz, Jerry M.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 18, 2013
Publication Date
January 1, 1998
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
AIAA Paper 98-4413
Meeting Information
Meeting: AIAA Guidance, Navigation, and Control Conference and Exhibit
Location: Boston, MA
Country: United States
Start Date: August 10, 1998
End Date: August 12, 1998
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NCC8-115
Distribution Limits
Public
Copyright
Other

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