Aircraft anti-skid braking active disturbance rejection control based on optimal slip ratio

The key of aircraft anti-skid braking control is controlling the braking torque to keep the system operating near the optimal slip ratio and obtaining the maximum coupling coefficient. A braking active disturbance rejection control algorithm based on optimal slip ratio is being introduced in this paper. After establishing a nonlinear model of aircraft braking, an extended state observer is designed for its model, which provides the amount of disturbance in the braking process. These changes are used as the feedback of the active disturbance rejection control to adjust the output. This adjustment method can simplify the previous complex nonlinear links into the simple series of integral series. At the same time, the addition of the transition process makes the system will not produce drastic overshoot when dealing with larger steps, and it has a good effect on the adaptability of the system. The simulation results show that the control law improves the anti-skid performance of the aircraft and has good regulation performance for disturbances within a certain range.