Document
Integrated Resilient Aircraft Control Project Full Scale Flight Validation NESC GN&C Face-to-Face in Chicago John Bosworth, VVMT Co-API August 2009 NESC August 2009
Full-Scale Flight Test Overview
• Objective - Provide validation of adaptive control law concepts through full scale flight evaluation.
• Technical Approach - Engage failure mode –destabilizing or frozen surface.
- Perform formation flight and air-to-air tracking tasks - Evaluate adaptive algorithm Stability metrics - - Model following metrics NESC August 2009
NASA N F-15 B #837
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yam."> _ ^, ^. ^ l ^ S ^^ _ 1 7 ^.,.4 ^^.^^___ ^^ • Last flight flown on Jan 30, 2009 – Indirect adaptive (Gen 1) – 1999 –Direct adaptive (Gen 2) – 2006 –Improved direct adaptive (Gen2a/b) – 2008 • Future flights will be on F/A-18 #853 Video from F 15 Flight Test https://mars.ndc.nasa.gov/cpx/dsweb/View/Collection-46/Document-450057 NESC August 2009 Gen2 & Gen2a Sigma Pi Flight Results Gen2 Results: Bank-to-Bank Gen2a Results: Bank-to-Bank Note: Reduced Tracking errors for similar Pilot Inputs NESC August 2009 IRAC F-18 #853 Testbed Dedicated Ghz processor for experiment • Shell &process for Simulink autocode (or c-code) • Can control commands to: • All aero surfaces (except speed brake) All pilot inputs Both engine throttles independently • Limit checks done by Class A software in RFCS • Potential for Class A experiment (dual ARTS IV or in quad RFCS) – take to landing?
• Tons of research instrumentation parameters • Simulated failure of multiple control surfaces NESC August 2009
Experiment Peer Review Process
• Brainstorming within NASA • Release an RFI for feedback and other ideas from Industry / Academia • Workshop with Industry / Academia – possibly St. Louis at ACC time ^ ----_. _ . ....:—^:. _ ....^:- • Final selection by NASA ^^^ • Flights in 2011 • Continue process for next experiments NESC August 2009 RFI Objectives • Objective 1: To validate adaptive control technology using manned flight experiments – Experiments addressing: • Challenges that can only be addressed by manned flight • Address barriers to implementation • Sufficiently large (or meaningful) failures • Objective 2: To examine the benefits of manned Vs autonomous recovery – Experiments addressing: • Types of pilot input to system • Separate, backup, or primary flight control implementation • Interactive adaptive NESC August 2009 RFI Objectives • Objective 3: To test and validate system-level reasoning for flight control reconfiguration – Experiments addressing: • Detection, diagnosis, prognosis, and isolation technologies for control reconfiguration and envelope limiting controls NESC August 2009
Conclusions
• Full scale flight testing provides an ability to validate different adaptive flight control approaches • Full scale flight testing adds credence to NASA’s research efforts • A sustained research effort is required remove the road blocks and provide adaptive control as a viable design solution for increase aircraft resilience.
NESC August 2009