Compensator Design to Prevent Pilot_Induced Oscillations in Aircrafts

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Eskandari Naddaf, Neda | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39463 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Malaek, Mohammad Bagher; Khayyat, Amir Ali Akbar
Abstract:
Pilot-Induced Oscillations is an unwanted, inadvertent phenomenon which has the ability to damage the aircraft completely. This thesis suggests a novel control method that can damp PIO after predicting its occurrence. The specific point of this control algorithm is that it contains a preprocessor that will not let the controller become activated unless in the case of probable PIOs, so pilot forces will not be disturbed in normal flight situations. Besides, with regard to the tendency of pilot towards establishing PIO, this control algorithm decides on pilot and controller shares in the loop. This research focuses on those groups of phenomena which take place as a result of a sudden disturbance that perturbs one of the states of Pilot-Vehicle System. It is also shown that the method can block PIO in cases of complex tracking. Some case studies about the effect of assymetric disturbances, changes in derivetives and controller tuning are also presented. Finally, some shortcomings of the suggested controller were inspected and further procedures for improving current method were proposed
Keywords:
Attack Angle ; Pilot-Induced Oscillation (PIO) ; Aircraft-pilot Coupling ; Aircraft Dynamic ; Pilot Dynamic

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