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Meeting	ACGS Committee Meeting 92 - Dayton - October 2003
Agenda Location	4 GENERAL COMMITTEE TECHNICAL SESSION 4.1 GOVERNMENT AGENCIES SUMMARY REPORTS 4.1.4 NASA 4.1.4.1 NASA Dryden
Title	NASA Dryden
Presenter	Joe Pahle
Available Downloads*	presentation
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Abstract	In the latter half of 2003, NASA DFRC continues to be involved in several flight programs with significant GNC involvement. The F/A-18 Active Aero-elastic Wing (AAW) completed the initial phase of flights to characterize the control power, structural response, and performance at both subsonic and supersonic flight conditions. After updating aerodynamic and structural models from flight data, the flight control design will be finalized in preparation for flights expected in summer 2004. The X-43A (Hyper-X) project team recently completed presentations for the final Flight Readiness Review in preparation for the second flight, currently scheduled for December 2003. This summer, the mishap report from the first flight was finally released publicly. The report can be found at http://www.nasa.gov/home/hqnews/2003/jul/HQ_03246_X43A_Mishap.html. The F-15 intelligent flight control project completed initial flights of the “Gen I” indirect adaptive flight control laws. During this flight phase, an online parameter identification algorithm successfully fed results to a dynamic cell structure neural net in order to develop and maintain an accurate on-board aerodynamic model. Recent work with the “Gen II” direct adaptive control laws integrated two candidate neural networks (sigma-pi and single-hidden layer) with the Boeing simplified dynamic inversion approach (VCAS). The project is preparing for flight test of these control laws in late spring of 2004. The Helios vehicle was lost June 26, during the second check-out flight. The vehicle encountered an undamped pitch oscillation at about 3000 ft. The mishap investigation is still ongoing.