1. Technical Update Vlad Gavrilets, Chief Scientist, Ph. D
Technical Update Vlad Gavrilets, Chief Scientist, Ph.D. Aerospace Control and Guidance Committee Meeting No. 97 Lake Tahoe, NV March 1-3, 2006
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2. A sample of ongoing activities
AAI Shadow TUAV
GS-211e FCS US Army MIL qualified; FRP
over 60,000 hours to date in Iraq
Low-cost hardware redundancy
Control adaptation to recover
performance after sustained damage
(sponsored by DARPA)
Morphing aircraft:
rapid, drastic changes in dynamics
handled by full-envelope design
based onFeedback LTI’zation
(sponsored by DARPA)
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3. Redundancy and Damage Tolerance
With the advent of low-cost and high-MTBF MEMS sensor products, and high-speed data buses, more so than ever higher levels of hardware redundancy are tenable.
Future UCAV concepts could incorporate many fully integrated flight control systems whereby mitigating correlated failures
Generalization Of
Redundancy
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4. Damage Tolerance (2)
Demonstration Scenario (Moderate turbulence, 160 kts.)
Vehicle has four spoilers for yaw control (drag devices) and two elevons.
At t=7s, a missile hit under the right wing causes a large roll excursion; completely destroys one yaw spoiler, and damages one elevon (halves its authority).
The nominal controller levels out the vehicle and initiates adaptation, commanding a doublet in roll, followed by a doublet in sideslip.
Vehicle successfully recovers original controller performance
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5. Damage Tolerance (3)
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6. Damage Tolerance (4)
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7. Damage Tolerance (5)
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