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In-Flight Suppression of an Unstable F/A-18 Structural Mode Using the Space Launch System Adaptive Augmenting Control SystemNASA's Space Launch System (SLS) Flight Control System (FCS) includes an Adaptive Augmenting Control (AAC) component which employs a multiplicative gain update law to enhance the performance and robustness of the baseline control system for extreme off-nominal scenarios. The SLS FCS algorithm including AAC has been flight tested utilizing a specially outfitted F/A-18 fighter jet in which the pitch axis control of the aircraft was performed by a Non-linear Dynamic Inversion (NDI) controller, SLS reference models, and the SLS flight software prototype. This paper describes test cases from the research flight campaign in which the fundamental F/A-18 airframe structural mode was identified using post-flight frequency-domain reconstruction, amplified to result in closed loop instability, and suppressed in-flight by the SLS adaptive control system.
Document ID
20150002870
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
VanZwieten, Tannen S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Gilligan, Eric T.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Wall, John H.
(Dynamic Concepts, Inc. Huntsville, AL, United States)
Miller, Christopher J.
(NASA Armstrong Flight Research Center Edwards, CA, United States)
Hanson, Curtis E.
(NASA Armstrong Flight Research Center Edwards, CA, United States)
Orr, Jeb S.
(Draper (Charles Stark) Lab., Inc. Huntsville, AL, United States)
Date Acquired
March 13, 2015
Publication Date
January 5, 2015
Subject Category
Aircraft Stability And Control
Structural Mechanics
Report/Patent Number
M14-3689
Meeting Information
Meeting: AIAA Guidance, Navigation, and Control Conference
Location: Kissimmee, FL
Country: United States
Start Date: January 5, 2015
End Date: January 9, 2015
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNM12AA41C
Distribution Limits
Public
Copyright
Public Use Permitted.
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