| Summary: | 碩士 === 大同大學 === 電機工程學系(所) === 96 === This thesis investigates a hierarchical adaptive fuzzy sliding-mode control, and it is proposed for a class of fourth-order nonlinear coupled system can be decoupled into two subsystems, and a sliding surface is defined for each subsystem. The fuzzy models are used to estimate the unknown function of the nonlinear dynamic system. A hierarchical fuzzy sliding model controller is developed for guaranteeing the tracking performance. Then, we propose the adaptive laws to adjust the free parameters of the fuzzy models. The stability of the fourth-order nonlinear system can be verified by Lyapunov stability theorem. Moreover, the proposed overall control schemes guarantee that all the signals are bounded and achieve the desired tracking performance. Finally, the examples are given to illustrate the feasibility and the effectiveness of the proposed control strategy.
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