Journal
ALEXANDRIA ENGINEERING JOURNAL
Volume 61, Issue 6, Pages 4573-4583Publisher
ELSEVIER
DOI: 10.1016/j.aej.2021.10.017
Keywords
Longitudinal aircraft; High-gain observer; Output feedback control; Singularly perturbed system; Two-time-scale system
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Funding
- National University of Sciences and Technology, Pakistan
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This paper presents output feedback control for longitudinal dynamics of fixed-wing aircraft using singular perturbation techniques. The longitudinal dynamic model is separated into two timescales, with a composite feedback control law based on sliding mode control and high-gain observers designed for trajectory tracking and state estimation. Simulations in MATLAB/Simulink environment demonstrate the robustness and computational efficiency of the proposed control method.
This paper presents output feedback control for longitudinal dynamics of fixed-wing aircraft using singular perturbation techniques. The longitudinal dynamic model is separated into two timescales. A composite feedback control law based on sliding mode control (SMC) is designed for slow and fast subsystems to track the aerodynamic velocity and flight path angle references. Additionally, two separate high-gain observers (HGO) are designed for the slow and fast subsystems to estimate system states. The proposed technique not only simplifies the design but also is computationally efficient. Simulations are performed in MATLAB/Simulink environment with results demonstrating that the proposed output feedback control method robustly achieves trajectory tracking. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University.
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