Command Governor for Constrained Attitude Angle Protection of the Wing-in-Ground Effect Craft near Sea Surface
Publication: Journal of Aerospace Engineering
Volume 35, Issue 6
Abstract
The high-speed, low-altitude region in the flight envelope of a wing-in-ground (WIG) effect craft requires attitude angle limitations to protect the aircraft from touching the ground or sea surface, and the safe boundaries of the attitude angles are time-dependent related to the flight height. This paper presents a command governor design for attitude angle protection of a WIG craft. In particular, this command governor adjusts the calculation of attitude angle boundaries and improves the maximal admissible set to handle the varying constraints. A set-membership state estimator is also employed to address the unmeasured disturbances and noise. The command governor design for pitch angle and bank angle protection is verified by simulation cases of climbing and turning of a WIG craft. The simulation results illustrate that the command governor can predict potential constraint violations and modify the pilot’s commands to handle the varying constraints as well as the contracted constraints affected by the measurement noise.
Practical Applications
The wing-in-ground effect craft is a kind of aircraft flying close to the ground or sea surface. The airframe and the wingtips of these crafts may touch the sea surface during climbing or turning due to the low flight altitude. We use a control method called “command governor” to prevent this dangerous situation and ensure flight safety. The command governor can guarantee the attitude angles of the aircraft within the safe boundaries by predicting potential constraint violations and modifying the pilot’s commands. In particular, we improve the command governor to handle the varying constraints as well as the contracted constraints affected by the wave disturbances and the measurement noise.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
We thank Tao Jin and his team for providing the aircraft design schemes and data. This work has been done in cooperation between Beihang University and the China Special Vehicle Research Institute.
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Published In
Journal of Aerospace Engineering
Volume 35 • Issue 6 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 27, 2021
Accepted: May 16, 2022
Published online: Jul 22, 2022
Published in print: Nov 1, 2022
Discussion open until: Dec 22, 2022
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