| Citation: | SUN Bing, CHEN Wei. Robust nonlinear flight control method against control saturation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2475-2483. doi: 10.13700/j.bh.1001-5965.2020.0473(in Chinese)
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When the aerocraft is maneuvering in a large envelope, its rudder surface and engine are easily saturated. This phenomenon will not only affect the stability of the closed-loop system, but also greatly shorten the service life of the engine and other key components. To solve this problem, a nonlinear flight control method against saturation was designed. First, the strict feedback nonlinear model of the aerocraft was established. Then, the rudder control and engine speed control commands were designed by using adaptive backstepping design method, and the modeling error was approximated by Radial Basis Function (RBF) network. To solve the control saturation problem, the corresponding anti-saturation dynamic compensation systems were designed respectively. By establishing the Lyapunov function of the closed-loop system, the update weights of RBF network and the structural parameters of anti-saturation dynamic compensation system were determined by stability theory, which ensures the global stability of the designed closed-loop control system. Finally, the simulation results show that, when the control saturation occurs, the anti-saturation compensation system can modify the control command in real time, which helps the system to get out of saturation state quickly and shorten the saturation time by 30%－60%, with high command tracking accuracy.
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