Journal
AEROSPACE SCIENCE AND TECHNOLOGY
Volume 94, Issue -, Pages -Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ast.2019.105421
Keywords
Unmanned aerial vehicle; Tilt-rotor; Pusher; Quadplane; Unsteady aerodynamics; Transition flight control
Categories
Funding
- National Research Foundation-Prime Minister's office, Republic of Singapore
- Aarhus University, Denmark [28173]
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A nonlinear unsteady aerodynamics model is coupled with a three degree of freedom quadplane to control the forward and backward transition between hover and steady level flight. The unsteady lift and drag forces are modeled using a lumped vortex model for flat plates. Two variants for the quadplane are considered: (i) a pusher and (ii) a tilt-rotor configuration in the absence of control surfaces to assess the controllability for altitude, attitude and forward speed. Conventional PID control is applied to generate the control inputs. The simulation results conclude that the pusher quadplane configuration is effortless to control as all the selected states are controllable, whereas for the tilt-rotor configuration, even though the vehicle is stable, altitude control is significantly more challenging due to one less control input when compared to the pusher configuration. (C) 2019 Elsevier Masson SAS. All rights reserved.
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