Improved adaptive fuzzy control for non-strict feedback nonlinear systems: a dynamic compensation system approach. (English) Zbl 1510.93183
Summary: This paper investigates the tracking control problem for uncertain nonlinear non-strict feedback systems (NSFSs) in the presence of full-state constraints and unmeasured disturbances. It is of great practical significance to realize the full-state constraint under disturbed conditions. In view of the non-strict feedback problem, a novel design framework of the state feedback control is given based on the newly proposed dynamic compensation system (DCS). Different from the traditional backstepping, the estimated signal based on the adaptive fuzzy system is indirectly introduced into the virtual and actual control laws through the DCS, which has the advantage of avoiding the algebraic-loop problem in NSFSs. Accordingly, the disturbance observer (DO) design method is improved based on this framework. Integrating the DCS into the DO design avoids the coupling problem between the disturbance and the unknown nonlinear function. An improved barrier Lyapunov function (BLF) is designed by introducing the concept of the inducible factor, and full-state constraints can be guaranteed after a transitional period for any initial state. By combining the DCS, the DO and the improved BLF, a novel adaptive fuzzy tracking control law is constructed, and all the signals in the closed-loop system are semiglobally uniformly ultimately bounded. Finally, the theoretical analysis and simulation results show that all states meet the corresponding constraints while meeting the stability.
MSC:
| 93C42 | Fuzzy control/observation systems |
| 34H05 | Control problems involving ordinary differential equations |
| 93C40 | Adaptive control/observation systems |
| 93B52 | Feedback control |
Keywords:
nonlinear non-strict feedback system; fuzzy logic system; disturbance observer; full-state constraints; dynamic compensation systemReferences:
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