Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
Control allocation to roll fly-by-wire aircraft with ailerons and roll spoilers
Submission Author:
Juliano A. B. Gripp , SP
Co-Authors:
Juliano A. B. Gripp, Marco Aurélio Guimarães Moreira, Luis Gonzaga Trabasso, Cleverson Marinho
Presenter: Juliano A. B. Gripp
doi://10.26678/ABCM.DINAME2023.DIN2023-0107
Abstract
This paper compares two methods of control allocation to roll fly-by-wire aircraft, taking advantage of the flexibility given by fly-by-wire architecture, in order to compute adequate deflections of ailerons and roll spoilers that comply with requirements of stability, performance and handling qualities. As first method, consider a dead zone for roll spoilers, such that roll spoilers deflect only after certain deflection of ailerons. This is a conservative approach to deal with nonlinear behavior of roll spoilers around small deflections for example, but can expose ailerons to rate saturation when deflecting alone in scenarios with poor control power. As second method, consider that ailerons and roll spoilers work together whenever there is roll command. This approach alleviates the work of the ailerons but it assumes a reliable model for design, which might be hard to develop. The study of the two methods covers real aspects for design, in order to implement in a Flight Control Computer (FCC): study of the bare-airframe (large-heavy transport/cargo aircraft adopted in this case), definition of objectives, control architecture, and linear design. It is possible to conclude that both methods are feasible to be implemented in FCC, complying with requirements of stability, performance and handling qualities. The results of second method are slightly better than first method, but requires a reliable model for design.
Keywords
nonlinear dynamics, control allocation, rate saturation, fly-by-wire aircraft, control law
