TY - GEN
T1 - Modeling and control of highly flexible flying-wing uav with multiple elevons and propellers
AU - Wang, Rui
AU - Zhu, Xiaoping
AU - Zhou, Zhou
AU - Wang, Zhengping
PY - 2016
Y1 - 2016
N2 - A coupled and geometrically nonlinear structural/flight dynamics model with unsteady aerodynamics model is developed for a large scale highly flexible solar-powered UAV. Based on the model, the UAV is trimmed with all the all-wing span elevons deflecting conformably. For the longitudinal control, the equation of motion in trimming condition is linearized firstly, then the dynamic model of elevons servo and integral signals are augmented into the control plant. The LQG/LTR method is employed to control the pitch angle. Simulation results show that the controller can provides a quick dynamic response with a very small additional deformation of the wing. For lateral-directional control, the lateral control efficiency of elevons is evaluated. It is found that due to the large lateral and poor directional static stability, the lateral control efficiency is very limited, and an aileron reversal coefficient is proposed and verified. In contrast, the multilateral differential throttles control has higher control efficiency in lat-dir control, but it must be noted that the inertia of propellers and motors will reduce the phase margin and the damping ratio of Dutch mode significantly due to the low cut-off frequency.
AB - A coupled and geometrically nonlinear structural/flight dynamics model with unsteady aerodynamics model is developed for a large scale highly flexible solar-powered UAV. Based on the model, the UAV is trimmed with all the all-wing span elevons deflecting conformably. For the longitudinal control, the equation of motion in trimming condition is linearized firstly, then the dynamic model of elevons servo and integral signals are augmented into the control plant. The LQG/LTR method is employed to control the pitch angle. Simulation results show that the controller can provides a quick dynamic response with a very small additional deformation of the wing. For lateral-directional control, the lateral control efficiency of elevons is evaluated. It is found that due to the large lateral and poor directional static stability, the lateral control efficiency is very limited, and an aileron reversal coefficient is proposed and verified. In contrast, the multilateral differential throttles control has higher control efficiency in lat-dir control, but it must be noted that the inertia of propellers and motors will reduce the phase margin and the damping ratio of Dutch mode significantly due to the low cut-off frequency.
KW - Heading augmentation stability by propellers
KW - Highly flexible
KW - Pitch control
KW - Roll control reversal
KW - Wing deformation
UR - http://www.scopus.com/inward/record.url?scp=85013664451&partnerID=8YFLogxK
M3 - 会议稿件
AN - SCOPUS:85013664451
T3 - 30th Congress of the International Council of the Aeronautical Sciences, ICAS 2016
BT - 30th Congress of the International Council of the Aeronautical Sciences, ICAS 2016
PB - International Council of the Aeronautical Sciences
T2 - 30th Congress of the International Council of the Aeronautical Sciences, ICAS 2016
Y2 - 25 September 2016 through 30 September 2016
ER -