Hybrid Attitude Control for Variable Thrust Axis Based UAV
Daobo Wang · Journal of Nanjing University of Science and Technology · 2010
In order to improve the autonomous flight performance of a unmanned aerial vehicle(UAV),an attitude control method combining the aerodynamic control surface deflection control and the thrust deflection control is presented here.The total force and moment of the variable thrust axis based UAV are given.The impact of the changed total force on the flight maneuverability is discussed,and the control compensation efficiency of the thrust moment is analyzed.Based on the traditional attitude control system,two thrust deflection angles are introduced as the new control variables,and a hybrid control mode of the flight attitude control system is designed.Simulations of the UAV attitude stabilization control with airflow interferences are done.The results show that the variable thrust axis technology can improve the stability and controllability of a UAV under the strong airflow interference,decrease the flight attitude angles and airflow angle errors,and compensate the inadequate efficiency of the control surfaces.