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From flight qualities to flight control law design : a simulation tool

Abstract : In this communication we present a PC based simulation tool, ICARE, for realistic validation of flight control laws for a small aircraft. This tool which can be used for the training of advanced students in aeronautics has been developed in our laboratory recently. The first step in the studies which can be carried with this software is the determination of natural flight qualities of an aircraft for a given operating point (flight envelope). The flight qualities of interest are static stability, dynamic stability and manoeuvrability, which can be derived from a state space representation of the linearized dynamics around the considered operating point while a qualitative scaling can be established for them. Then requirements issued in qualitative terms for the full behaviour of the controlled aircraft can be taken in consideration. ICARE provides a structure for the definition of the control laws which will meet these requirements. Also, robustness studies about these control laws over the entire flight envelope can be carried in qualitative terms with support of this software. Since automatic flight operation is characterized by the frequent occurrence of mode shifts, it has been judged interesting to simulate these transients. So, ICARE allows the simulation of not only the response of the flight dynamics of the aircraft to autopilot inputs, but also of the operation of the Flight Control Unit and of the Mode Annonciator Pannel of Autopilot. However, it is important to observe that ICARE is not a flight simulator package since no Attitude Director Indicator or Horizontal Situation Indicator is available on the screen.
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  • HAL Id : hal-01022429, version 1


Felix Mora-Camino, Karim Achaibou. From flight qualities to flight control law design : a simulation tool. ICSEE 1995, 2nd International Conference on Simulation in Engineering Education, Jan 1995, Las Vegas, United States. pp 82-87. ⟨hal-01022429⟩



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