### Rudderless Attitude Control Flight Test Based on Circulation Control of Tailless Flying Wing in Pitch and Roll Axes

• Received:2022-11-04 Revised:2023-01-13 Online:2023-01-18 Published:2023-01-18

Abstract: Circulation control is efficient for rudderless flight control by driving the compressed air jet to generate a virtual rudder surface, which significantly improves low detectability. A closed-loop control strategy based on the terminal pressure feedback of the actuator is proposed, and an airborne multi-channel closed-loop control jet actuation system is independently developed, which was fused into flight control system, realized closed loop attitude control based on active jet. Based on the UAV with tailless flying wing configuration, in a fully autonomous flight control mode, the capability of circulation control for pitch and roll attitude control is quantitatively studied through the flight test at 60m/s cruising speed. The results show that the combination of circulation actuator channels is available for bidirectional continuous and stable control of pitch and roll control torque; the response delay of the jet-actuation system is less than 0.02s,and the response time of the jet-actuated UAV at the attitude angle velocity is less than 0.02s;the pressure ratio -1.025 of the pitch circulation actuator is equivalent to the pitching moment generated by the elevator at -3.0° rudder angle, and the pressure ratio 1.050 of the roll circulation actuator is equivalent to the rolling moment generated by the aileron at 2.0° rudder angle, so as to realize rudderless attitude control in longitudinal and lateral attitude respectively.

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