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Meeting	ACGS Committee Meeting 117 - Napa, CA - March 2016
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	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. 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 (MIDAAS) 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. Due to successful isolation of problematic modes, this solution can be applied independent of any primary flight control solution. In previous work, a subspace system identification solution was incorporated with MIDAAS to rapidly identify a model and synthesize a controller on-line. In more recent work, MIDAAS has been demonstrated on models of the X-56A MUTT and the University of Minnesota mini-MUTT. It has also been demonstrated on the UMN mini-MUTT vehicle on the ground where tests results display sufficient suppression of structural modal response.