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Meeting	ACGS Committee Meeting 101 - Salt Lake City - March 2008
Agenda Location	8 SUBCOMMITTEE A - AERONAUTIC AND SURFACE VEHICLES 8.3 Alleviation of Pilot-Vehicle System Loss of Control through Smart-Cue and Smart-Gain Concepts - Flight Test Evaluation Results
Title	Alleviation of Pilot-Vehicle System Loss of Control through Smart-Cue and Smart-Gain Concepts - Flight Test Evaluation Results
Presenter	Dave Klyde
Affiliation	STI
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	The Smart-Cue and Smart-Gain concepts were developed as a means to alleviate pilot-vehicle system loss of control in the presence of control surface actuator rate limiting. Both concepts exploit the measure of dynamic distortion, i.e., the difference between the actual and an ideal aircraft control system response. The concept of dynamic distortion introduced in the work of A’Harrah has significantly evolved in work conducted by Systems Technology, Inc. (STI) during a two-phase program sponsored by NASA Dryden Flight Research Center. In this work the “distortion” of interest results from control surface rate limiting and is quantified by the surface Position Error, while the “distortion metric” is the Position Lag. A force feedback cue (the constraining function) and/or a command path gain reduction are created when the Position Error exceeds the Position Lag (the alerting function). This presentation examines the approach and landing flight test evaluations conducted using the Calspan Corporation Learjet II In-Flight Simulator. Three test pilots evaluated various Smart-Cue and Smart-Gain implementations while performing the precision offset landing task. One of the pilots flew on a calm air day, while the other two flew on days with moderate turbulence and significant cross winds. The clear performance enhancer for all three pilots was the Smart-Gain, however, the best results for the two pilots that flew under adverse conditions were obtained for the configuration that featured both the Smart-Cue and Smart-Gain active. This configuration eliminated the undesirable motions that were encountered in the final centerline correction when only the Smart-Gain was active.