Application of global adaptive fuzzy backstepping control in rocket launcher servo system

A global adaptive fuzzy control method was proposed on the basis of backstepping approach for rocket launcher servo system with unknown nonlinear terms and external disturbances. A Gaussian fuzzy function was applied to compensate some uncertainty factors, such as parameter variation, load disturbances and virtual function. And, the controller parameters were tuned in real-time mode according to the operation conditions. The control law was derived iteratively according to the servo system's mathematical model and conventional backstepping theory. Then, the controller's stability was verified by using Lyapunov function. The simulation study on the position tracking under parameters variation and disturbance was carried out, and the change law of the virtual control function was given under complex signal. The simulation results show that the proposed approach can guarantee the response speed and control accuracy and has a strong robustness for the structure parameter uncertainties.