SDRE and LQR Controls Comparison Applied in High-Performance Aircraft in a Longitudinal Flight

(1) Guilherme P. Dos Santos Mail (Federal University of Technology - Paraná (UTFPR), 84016-210, Ponta Grossa, PR, Brazil, Brazil)
(2) Adriano Kossoski Mail (São Paulo State University, School of Engineering, 17033-360, Bauru, SP, Brazil, Brazil)
(3) Jose M. Balthazar Mail (São Paulo State University, School of Engineering, 17033-360, Bauru, SP, Brazil, Brazil)
(4) * Angelo Marcelo Tusset Mail (Federal University of Technology-Paraná (UTFPR), Brazil)
*corresponding author

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.

Keywords


High-performance aircraft; LQR control; SDRE control

   

DOI

https://doi.org/10.31763/ijrcs.v1i2.329
      

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International Journal of Robotics and Control Systems
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