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All Journal International Journal of Robotics and Control Systems
Guilherme P. Dos Santos
Federal University of Technology - Paraná (UTFPR), 84016-210, Ponta Grossa, PR, Brazil
Control & Systems Engineering Electrical & Electronics Engineering

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SDRE and LQR Controls Comparison Applied in High-Performance Aircraft in a Longitudinal Flight Guilherme P. Dos Santos; Adriano Kossoski; Jose M. Balthazar; Angelo Marcelo Tusset
International Journal of Robotics and Control Systems Vol 1, No 2 (2021)
Publisher : Association for Scientific Computing Electronics and Engineering (ASCEE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31763/ijrcs.v1i2.329

Abstract

This paper presents the design of the LQR (Linear Quadratic Regulator) and SDRE (State-Dependent Riccati Equation) controllers for the flight control of the F-8 Crusader aircraft considering the nonlinear model of longitudinal movement of the aircraft.  Numerical results and analysis demonstrate that the designed controllers can lead to significant improvements in the aircraft's performance, ensuring stability in a large range of attack angle situations. When applied in flight conditions with an angle of attack above the stall situation and influenced by the gust model, it was demonstrated that the LQR and SDRE controllers were able to smooth the flight response maintaining conditions in balance for an angle of attack up to 56% above stall angle.  However, for even more difficult situations, with angles of attack up to 76% above the stall angle, only the SDRE controller proved to be efficient and reliable in recovering the aircraft to its stable flight configuration.
Co-Authors Adriano Kossoski Angelo Marcelo Tusset Jose M. Balthazar