Dynamic Modeling and Control for Tilt-Rotor UAV Based on 3D Flow Field Transient CFD

The tilt-rotor unmanned aerial vehicle (TRUAV) is characterized by both multi-rotor vertical takeoff or landing and fixed-wing long-duration flight. Not only the structure of TRUAV complex, but also aerodynamic coupling severe. Especially when in transition mode, rotor flow field wake are complicated. abnormal variation force blades will directly affect balance manipulation aircraft. downwash generated spiral propeller tip vortex interference impact wing from every direction, forming a blocked three-dimensional effect on surface, which seriously affects stability UAV. In this paper, transient CFD (Computational Fluid Dynamics) numerical simulation was applied to examine fields fuselage under modal as well disturbance. addition, dynamics model established based change tilt angle state, considering slip flow, we analyzed distribution mode disturbance rotor, identified each parameter required for modeling. A cascade PID control strategy designed TRUAV, results verify that proposed can remain stable even maximum roll 20 degrees. At last, provide data support optimization profile design subsequent flight methods.