A control method of flying wing UAV for penetration of microburst
WANG Yanxiong;ZHU Xiaoping;ZHOU Zhou;XU Mingxing;FENG Yin'an;Science and Technology on UAV Laboratory,Northwestern Polytechnical University;
Microburst is the most dangerous low-level wind shear.The control lawof flying wing UAV requires rapid response and good robustness for penetration of microburst during taking off and landing.Based on the low pitch control effectiveness at low airspeed and the high elevator additional lift of high aspect ratio flying wing UAV,a complex control scheme which integrates elevator additional lift control with aerodynamic control is proposed.Nonlinear command distribution strategy based on output error for reference is developed,and command distribution strategy based on angle of attack protection is designed.The wind disturbance and the model uncertaintiesare taken as uncertain factors.Nonlinear control law of flying wing UAV based on active disturbance rejection control(ADRC)theory is designed for estimating and compensating the wind disturbance and the model uncertainties.The simulated results show that the control method combines complex control with ADRC,makes flight path unit step response rapidly,and shortens its rise time by 64%,estimates and compensates the wind disturbance,maintains altitude loss under 2m,protects angle of attack and keeps it under 5.5°.Therefore,this control method provides a reference way for and finally keeping flying wing UAV safe during penetration of microburst.
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