Eventos Anais de eventos
CONEM 2018
X Congresso Nacional de Engenharia Mecânica
Nonlinear dynamics and linear control applied to an fighter aircraft in longitudinal flight at high angles of attack
Submission Author:
Guilherme Pacheco dos Santos , PR
Co-Authors:
Guilherme Pacheco dos Santos, Angelo Marcelo Tusset, Frederic Conrad Janzen, Rodrigo Tumolin Rocha, Airton Nabarrete, José Manoel Balthazar
Presenter: José Manoel Balthazar
doi://10.26678/ABCM.CONEM2018.CON18-1449
Abstract
The fighter aircrafts operate regularly in-flight regimes where system’s nonlinearities influence directly into their dynamic. This paper considers the study of a fighter aircraft which operates in high angles of attack of the wing. The mathematical modelling and numerical simulations were developed, becoming at a system of nonlinear differential equations that represent the dynamics of an aircraft F-8 ”Crusader” in longitudinal flight, considering the effect of wind speed constant in the dynamic response of the aircraft. We performed the 0-1 test to determine if the system is chaotic or periodic, in relation to the angle of attack of the aircraft. The control is proposed having as control parameter the tail deflection angle and designed using the control method of Linear Quadratic Ricatti (LQR) with the purpose of stabilizing oscillations of angle of attack of the wing, considering critical regions of aircraft behaviour. Numerical simulations demonstrated the effectiveness of the proposed control strategy, where controller was able to respond quickly to retrieve the aircraft from a stall situation.
Keywords
Fighter Aircraft, Longitudinal Flight, High Angles of Attack, Linear Control, Linear Quadratic Ricatti (LQR)
