Abstract:

For overcoming the higher order nonlinearity and parameters variability in the model of the antiskid braking system （ABS） of aircraft, a dynamic surface control approach based on the barrier Lyapunov function （BLF） is proposed to design the slip ratio tracking control with an output upper constraint. The primary purpose of the BLF is to keep the closed-loop system operates within the stable region of the adhesion coefficient curve. As for control purpose， only longitudinal dynamics of the aircraft are considered, in combination with the model of the electromechanical actuator, the whole state space model of the ABS is described as the strict feedback form. In some ways, the control objective should be regarded as the stabilization of the nonlinear system with output constraints. Lyapunov stability analysis of the closed-loop system indicates that the proposed control strategy guaranteed the tracking error of slip ratio is semi-globally uniformly ultimately bounded and converging toward an arbitrarily small neighborhood of the origin. Simulation results validate the effectiveness of the proposed method. Compared with the traditional control method, this control scheme not only has an obvious advantage in its stability but also avoid the large oscillation of the slip ratio particularly at the end of the braking. As a result, the performance of the system is enhanced significantly.