Robust adaptive fuzzy control of a class of uncertain switched nonlinear systems with mismatched uncertainties. (English) Zbl 1396.93083
Summary: This paper studies the adaptive fuzzy control problem for a class of uncertain switched nonlinear systems with mismatched uncerta inties and external disturbances. A new
switched adaptive control technique for the problem studied is set up such that the considered switched systems can be stabilized under a class of switching signals characterized by the generalized average dwell time condition. First, the adaptive state feedback controller is designed based on tuning the estimations of the bounds on switching parameters, instead of estimating the switching parameters directly. Next, by using a switched observer to reconstruct the states of the system, an output feedback controller is also presented. In the design procedure, fuzzy logic systems are used to approximate the unknown nonlinear functions. To overcome the undesirable chattering phenomenon, both control laws are developed using the continuous control strategy. It is shown that both controllers can guarantee that all the signals in the resulting closed-loop system are bounded. Finally, two simulation examples are presented to demonstrate the effectiveness of the proposed control results.
MSC:
| 93C42 | Fuzzy control/observation systems |
| 93C40 | Adaptive control/observation systems |
| 93B35 | Sensitivity (robustness) |
| 93C10 | Nonlinear systems in control theory |
| 93C30 | Control/observation systems governed by functional relations other than differential equations (such as hybrid and switching systems) |
| 93C41 | Control/observation systems with incomplete information |
| 93B52 | Feedback control |
| 93B51 | Design techniques (robust design, computer-aided design, etc.) |
Keywords:
fuzzy logic systems; uncertain switched nonlinear systems; average dwell time; adaptive fuzzy controlReferences:
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