In this paper, the influence of the flight control system over the offnominal behavior of a remotely operated air vehicle is evaluated. Of particular interest is the departure/upset characteristics of the closed-loop system near and beyond stall. The study vehicle is the NASA Generic Transport Model, and both fixed-gain and gain-scheduled versions of a linear quadratic regulator controller with proportional and integral components are evaluated. Bifurcation analysis is used to characterize spiral and spin behavior of the aircraft in closed-loop form and yields an understanding of the underlying vehicle dynamics outside the standard flight envelope. The use of a “gain parameter” to scale the controller gains provides information on the sensitivity of stability to gain variation, along with tracking how the controller modifies the open-loop steady states. Hence, this provides a means of assessing the effectiveness of the controller and evaluating the upset tendencies of the aircraft.
Nonlinear Dynamics of Aircraft Controller Characteristics Outside the Standard Flight Envelope
Journal of Guidance, Control, and Dynamics ; 38 , 12 ; 2301-2308
2015-03-18
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Nonlinear Dynamics of Aircraft Controller Characteristics Outside the Standard Flight Envelope
Online Contents | 2015
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