Adaptive control for fault tolerant autonomous carrier recovery

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Authors
Reed, Scott
Steck, James E.
Advisors
Issue Date
2018-01-07
Type
Conference paper
Keywords
Model reference adaptive control , Adaptive control systems , Control surfaces , Linear quadratic Gaussian , Flight path angle , Angle of attack , Airspeed , Aircraft carriers , Heading angle , Bank angle
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Citation
Reed, S., & Steck, J. E. (2018). Adaptive control for fault tolerant autonomous carrier recovery. Paper presented at the AIAA Guidance, Navigation, and Control Conference, 2018, (210039) doi:10.2514/6.2018-0871 Retrieved from www.scopus.com
Abstract

This paper presents the use of adaptive control methodologies for the recovery to an aircraft carrier of an autonomous fixed wing aircraft. The control architecture used is model reference adaptive control that is implemented in the pitch, roll, yaw, and airspeed axes to provide 6 degree-of-freedom control of the aircraft. Control systems are developed for the NAVAIR ExJet aircraft model. The structure of the controller includes a first-order linear model follower and an adaptive critic controller. Adaptation is used to augment the command signal produced by the adaptive critic controller, the following methods are used: adaptive bias corrector, optimal control modification, and local linear model compensation. An inverse controller, based on a state space model, generates the control effector commands. The control system reference inputs are rotational rates and airspeed, an outer-loop controller is provided to direct the aircraft to the landing point. Control system design is through the use of metrics based on the nominal error, time delay margin, and landing accuracy. The control system is evaluated under nominal, effector failure, and control system modeling error conditions. The control system defined is capable of providing the desired control under nominal, failure, and modeling error conditions.

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Description
This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States.
Publisher
American Institute of Aeronautics and Astronautics, Inc.
Journal
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Series
AIAA Guidance, Navigation, and Control Conference
2018
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