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Stability Metrics for Simulation and Flight-Software Assessment and Monitoring of Adaptive Control Assist CompensatorsDue to a need for improved reliability and performance in aerospace systems, there is increased interest in the use of adaptive control or other nonlinear, time-varying control designs in aerospace vehicles. While such techniques are built on Lyapunov stability theory, they lack an accompanying set of metrics for the assessment of stability margins such as the classical gain and phase margins used in linear time-invariant systems. Such metrics must both be physically meaningful and permit the user to draw conclusions in a straightforward fashion. We present in this paper a roadmap to the development of metrics appropriate to nonlinear, time-varying systems. We also present two case studies in which frozen-time gain and phase margins incorrectly predict stability or instability. We then present a multi-resolution analysis approach that permits on-line real-time stability assessment of nonlinear systems.
Document ID
20100023313
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Hodel, A. S. (Auburn Univ. AL, United States)
Whorton, Mark (NASA Marshall Space Flight Center Huntsville, AL, United States)
Zhu, J. Jim (Ohio Univ. Athens, OH, United States)
Date Acquired
August 24, 2013
Publication Date
July 18, 2008
Subject Category
Air Transportation And Safety
Report/Patent Number
M10-0712
Meeting Information
Meeting: 2008 AIAA Guidance, Navigation, and Control Conference and Exhibit
Location: Honolulu, HI
Country: United States
Start Date: August 18, 2008
End Date: August 21, 2008
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNX07AN46G
Distribution Limits
Public
Copyright
Public Use Permitted.

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