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Windshear Recovery Using Fuzzy Logic Guidance and Control

1999; American Institute of Aeronautics and Astronautics; Volume: 22; Issue: 1 Linguagem: Inglês

10.2514/2.7624

1533-3884

M. Aznar Fernández-Montesinos, G. Schram, Rob Vingerhoeds, H.B. Verbruggen, J.A. Mulder,

Aerospace Engineering and Control Systems

Many aircraft accidents are related to hazardous windshear phenomena, in particular to the microburst. The energy loss which is associated with a microburst encounter can be very dangerous for the aircraft at low altitude. In this paper, a recovery concept is introduced, making a distinction between control, guidance, and flight envelope protection. For control, a fuzzy logic controller is developed based on energy principles, since the windshear is basically an energy problem. Additional energy is automatically supplied during the microburst by increasing the thrust. The available energy is distributed between altitude and airspeed by pitch angle according to a priority assignment, activated at the encounter of the windshear. This priority is determined with respect to a minimum airspeed and altitude, the flight envelope protection mechanism. Both controller and protection are integrated in one fuzzy logic system. Once the flight bounds are guaranteed, the controller tracks the flight path indicated by a predetermined guidance strategy. The application of the concept is demonstrated by a realistic simulation example.