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Meeting	ACGS Committee Meeting 111 - Reno, Nevada - March 2013
Agenda Location	4 GENERAL COMMITTEE TECHNICAL SESSION 4.2 Research Institutions, Industry, and University Reports 4.2.1 Research Institutions and Companies 4.2.1.7 Systems Technology, Inc.
Title	Systems Technology, Inc.
Presenter	Dave Klyde
Available Downloads*	presentation
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Abstract	Systems Technology, Inc ACGSC Meeting #111, Reno, NV, March 6-8, 2013 David Klyde dklyde@systemstech.com Real-Time Methods for Adaptive Suppression of Adverse ASE Dynamics Adverse aeroservoelastic interaction is a problem on aircraft of all types causing repeated loading, enhanced fatigue, undesirable oscillations and catastrophic flutter. This adverse response is traditionally suppressed using notch and/or roll off filters in the primary flight control system architecture. This solution has pitfalls; rigid body performance is degraded due to resulting phase penalty and the filter may not be robust to off nominal behavior. An adaptive approach has been developed that determines optimal blends of both multiple outputs and multiple inputs which effectively isolate and suppress problematic lightly damped modes via negative feedback while minimizing adverse effects on the remaining modal response. Additional emphasis is given towards minimizing adverse effects on aircraft rigid body modes so that low frequency behavior is unchanged with minimal phase penalty. A subspace system identification solution has been incorporated to rapidly identify a large order model of the aircraft from multiple measurement sensors. This identified model is used to synthesize the controller, demonstrating the solution to be completely adaptive. Due to successful isolation of problematic modes, this solution can be applied independent of any primary flight control solution. Algorithm validation was performed via real-time piloted simulation of large order aeroelastic F/A-18C aircraft models. C-2A Ground Handling Systems Technology, Inc. has been contracted by the Navy to review and analyze the ground handling of the C-2A. Work included cornering and braking testing of the C-2A main gear tires and cornering testing of the nose gear tires at the Calspan Tire Research Facility (TIRF). The tire test data was incorporated into ground handling models that addressed tires only and tires plus direct and indirect aerodynamic effects. A Flight Centered Approach to Assess Dynamic Flight Simulation and Simulator Force Cueing Fidelity In this Phase II SBIR program for the Human Effectiveness Directorate of the Air Force Research Laboratory, Systems Technology, Inc. is leveraging the significant past research with a flight-centered approach to produce effective qualitative and quantitative measures of simulator force cueing fidelity as it relates to tactical aircraft flight training that will be incorporated into the Real-Flight software toolbox. To validate the proposed approach, a prototype version of the software has been created and was evaluated via flight test and piloted simulation. Real-Flight features a complete set of task performance, pilot-vehicle system, psychophysiological, and qualitative metrics. Flight test evaluations were conducted using the Calspan Corporation Learjet In-Flight Simulator to provide a direct measure of how well various simulator force cueing components aid in replicating tactical aircraft training scenarios. The same set of test pilot participants supported both the flight and simulator activities.