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Optimal Control to Recover a Safe Situation from Low/High-Energy Situation in Approach

Journal Article
2011-01-2618
ISSN: 1946-3855, e-ISSN: 1946-3901
Published October 18, 2011 by SAE International in United States
Optimal Control to Recover a Safe Situation from Low/High-Energy Situation in Approach
Sector:
Citation: Lefebvre, M. and Constans, F., "Optimal Control to Recover a Safe Situation from Low/High-Energy Situation in Approach," SAE Int. J. Aerosp. 4(2):1007-1020, 2011, https://doi.org/10.4271/2011-01-2618.
Language: English

Abstract:

The main study illustrated in this paper deals with the computation of commands which allow an aircraft to recover a nominal energy trajectory from a low/high energy state during the approach phase. The commands taken into account in this paper are the slat/flap aerodynamic control surfaces which allow the aircraft to maintain the best lift performance for low velocities during the approach phase. In this study, it is supposed that the aircraft maintains a known vertical trajectory, simplified by a constant ground slope, while no engines and airbrakes are used. A non-linear optimization approach is studied in this paper and two methods are tested: a) Hermite-Simpson, trapezoidal collocation methods, b) Sequential numerical integration method. These different methods are tested and simulation results are given for comparison, with different initial velocities permitting to change the initial energy state.