Technical Update Vlad Gavrilets, Chief Scientist, Ph. D Technical Update Vlad Gavrilets, Chief Scientist, Ph.D. vgavrilets@athenati.com Aerospace Control and Guidance Committee Meeting No. 97 Lake Tahoe, NV March 1-3, 2006 ACG FALL 2005

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) ACG FALL 2005

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 ACG FALL 2005

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 ACG FALL 2005

Damage Tolerance (3) ACG FALL 2005

Damage Tolerance (4) ACG FALL 2005

Damage Tolerance (5) ACG FALL 2005