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Cited 6 time in webofscience Cited 5 time in scopus
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Control law design to improve the unexpected pitch motion in slow down turn maneuver

Authors
Kim, Chong-supJin, TaebeomKoh, Gi-oakKim, Byoung Soo
Issue Date
Jan-2022
Publisher
Mechanical Engineering Publications Ltd.
Keywords
Unexpected pitch motion; over Nz; additional augmentation; nonlinear dynamic inversion
Citation
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, v.236, no.1, pp 123 - 139
Pages
17
Indexed
SCIE
SCOPUS
Journal Title
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
Volume
236
Number
1
Start Page
123
End Page
139
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1783
DOI
10.1177/09544100211008602
ISSN
0954-4100
2041-3025
Abstract
The highly maneuverable fighter aircraft is exposed to unexpected pitch motion such as over-N-z (normal acceleration) and N-z-drop characteristics in transonic and supersonic flight conditions with moderate angle of attack. These characteristics not only degrade flying qualities by destabilizing the aircraft but also threaten flight safety by increasing the structural load. This article proposes an additional augmentation control in the incremental nonlinear dynamic inversion structure, which feeds back the error of pitch angular acceleration to mitigate unexpected pitch motion in slow down turn maneuver. We evaluate the stability, flying qualities, and robustness of the proposed control system by performing the frequency-domain linear analysis and the time-domain numerical simulations based on the mathematical model of advanced trainer aircraft. As a result of the evaluation, the additional augmentation control further improves flying qualities and deceleration performance of the aircraft by decreasing over-N-z and N-z-drop characteristics in high-N-z maneuvering in the transonic flight condition as well as ensuring the stability and robustness of the control system against the major uncertainty factors of the aircraft system compared to the existing transonic pitching moment compensation (TPMC) control in which the predefined scheduling for N-z feedback is used.
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