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Meeting	ACGS Committee Meeting 115 - Portland, OR - March 2015
Agenda Location	4 GENERAL COMMITTEE TECHNICAL SESSION 4.2 Research Institutions, Industry, and University Reports 4.2.1 Research Institutions and Companies 4.2.1.1 Systems Technology, Inc.
Title	Systems Technology, Inc.
Presenter	Dave Klyde
Available Downloads*	presentation
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Abstract	Systems Technology, Inc ACGSC Meeting #115, Portland, OR, March 4-6, 2015 David Klyde dklyde@systemstech.com Creating Spatial Disorientation in Flight Simulation A study conducted by The Boeing Company of world-wide commercial jet transport accidents has found the most common events to be loss of control associated with an inability of pilots to recover from upsets and unusual attitudes. A key component in some of these events is pilot spatial disorientation (SD). Improved pilot training in these abnormal flight conditions, including the ability of training simulators to replicate spatial disorientation, is needed to reduce loss of control accidents. Traditional commercial pilot training is conducted with hexapod-based motion systems that are limited in their ability to replicate the motion cues associated with these events. Given these short-comings, how can air carriers and other stakeholders be certain that there is positive transfer of training regarding spatial disorientation from the simulator to flight? To address this question, a team led by Systems Technology, Inc. (STI) is developing SD training scenarios that can be used with Level D certified hexapod-based commercial pilot training simulators. This update provides simulation results from the checkout simulation activities that took place this February using the NASA Ames B747-400 simulator. Aeroservoelastic Suppression of LCO due to Free-Play using a Combined Analytical and Experimental Approach Aerodynamic control surfaces with excessive free-play can cause limit cycle oscillations (LCO), a sustained vibration of constant amplitude that is caused by a combination of aeroservoelastic effects and free-play. The LCO can impact handling qualities, ride quality and can cause structural fatigue, ultimately leading to structural failure. Due to the negative impacts of free-play induced LCO, very stringent absolute free-play limits have been established for control surfaces on both military and commercial aircraft. Systems Technology, Inc. (STI) and Boeing have developed an innovative, robust, and reliable active control concept that alleviates the adverse effects of control surface free-play, relieving costly requirements associated with manufacturing, inspection, and part replacement. The solution involves a novel linear fractional transformation framework for relevance to models of varying complexity and a robust control approach that exploits the piecewise-linear nature of the free-play nonlinearity. To aid in control design and to provide practical real-world relevance, a combined analytical and experimental approach was implemented by the STI-Boeing team. The solution is minimally intrusive, providing for application to a wide array of existing and future aircraft (including both high speed fighters and transport aircraft), ultimately resulting in significant cost savings and increased pilot safety.