Abstract:

An e-σ-modification hybrid adaptive law based cascaded sideslip flight control scheme is proposed aiming at control surface failures of conventional configuration. The stability proof of the sideslip cascaded loop is given and then follows the expression between regulating time ts and PI control parameters under the assumption of faster response of the roll angle and the yaw rate than those of the sideslip. In the presence of perturbation and unmodeled input dynamics, the fundamental model reference adaptive control (MRAC) schemes for roll angle and yaw rate transfertunnels of relative degrees equal to one or greater are constructed respectively. The Lyapunov method guarantees that all signals of the robust adaptive control innerloop updated by the e-σ-modification law are uniformly bounded. Further the method of choosing adaptive gains to minish error boundaries of the output and control parameter of the e-modification law is also analyzed. The simulation results validate the effectiveness and show that the method not only owns satisfactory sideslip angle holding and tracking performances, but also shrinks error boundaries mentioned above in an allowable deflection angle range of control surfaces.