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Backstepping-Based Adaptive Control for Uncertain Fractional-Order Nonlinear Systems

机译:基于BackStepping的不确定分数阶非线性系统的自适应控制

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In this paper, we aim to solve the output tracking problem for a class of uncertain single-input-single-output (SISO) commensurate fractional-order uncertain nonlinear systems in the presence of bounded disturbances. To this end, an adaptive backstepping smooth control strategy is proposed, with two adaptive laws respectively estimating unknown system uncertainties and the upper bound of disturbances. Theoretical analysis is provided by employing fractional directed Lyapunov method to show that all the closed-loop signals are uniformly ultimately bounded. Subsequently, an adaptive smooth control scheme for second-order fractional systems is further proposed which guarantees asymptotically output tracking. Simulation studies are presented to verify the effectiveness of the proposed control methods.
机译:在本文中,我们的目的是解决一类不确定的单输入单输出(SISO)的输出跟踪问题在存在有界扰动的存在下相应的分数级不确定非线性系统。 为此,提出了一种自适应的反向光滑的控制策略,分别估算了两个自适应定律,分别估算了未知的系统不确定性和扰动的上限。 通过采用分数指向的Lyapunov方法提供理论分析,以表明所有闭环信号均匀最终界定。 随后,进一步提出了一种用于二阶分数系统的自适应平滑控制方案,其保证了渐近输出跟踪。 提出了仿真研究以验证所提出的控制方法的有效性。

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