Abstract
NASA's Generic Transport Model (GTM) is a remote-controlled, 5.5 percent scale commercial aircraft. An L 1 adaptive controller was recently designed and flight tested on the GTM. Oscillations in the elevator command were observed at 1.4 to 2 Hertz during the first flight test in September 2009. In most flight conditions the L 1 adaptive controller can be approximated by a linear time-invariant system. Thus linear analysis tools can be used to assess the performance and robustness of the feedback system with the L 1 controller. The initial L 1 design met the NASA requirement for 60 msec of time delay margin. However, the linear analysis indicates that the margin requirements were insufficient due to inaccurate models that were available at the time of the first flight test. A revised L 1 controller has significantly larger margins and demonstrated good performance during subsequent flight tests.
Original language | English (US) |
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Title of host publication | AIAA Guidance, Navigation, and Control Conference |
DOIs | |
State | Published - 2010 |
Event | AIAA Guidance, Navigation, and Control Conference - Toronto, ON, Canada Duration: Aug 2 2010 → Aug 5 2010 |
Publication series
Name | AIAA Guidance, Navigation, and Control Conference |
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Other
Other | AIAA Guidance, Navigation, and Control Conference |
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Country/Territory | Canada |
City | Toronto, ON |
Period | 8/2/10 → 8/5/10 |
Bibliographical note
Funding Information:This research was supported under the NASA Langley NRA contract NNH077ZEA001N entitled “Analytical Validation Tools for Safety Critical Systems”. The technical contract monitor is Dr. Christine Belcastro. The authors gratefully acknowledge Irene Gregory, Naira Hovakimyan, and Enric Xargay for