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Robust adaptive fault-tolerant control for a class of uncertain nonlinear systems with multiple time delays

机译:一类具有多个时滞的不确定非线性系统的鲁棒自适应容错控制

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This study is concerned with the problem of robust adaptive fuzzy fault-tolerant control for a class of uncertain nonlinear systems with mismatching parameter uncertainties, external disturbances, multiple state time delays perturbations and actuator failures, which include loss of effectiveness, outage and stuck modes. A novel direct adaptive fuzzy tracking control scheme is developed to achieve the fault tolerant control objective. First, by introducing a positive nonlinear control gain function, the effects of state time delays and actuator failures are effectively compensated. Then, a suitable fuzzy logic system (FLS), which is used to approximate the corresponding nonlinear function, is constructed to eliminate the influences on mismatched parameter uncertainty and external disturbance. Moreover, it is shown that all the closed-loop system signals are uniformly bounded and that the tracking error converges to a small neighborhood of the origin via Lyapunov-Krasovskii stability analysis. Finally, the proposed adaptive fuzzy fault-tolerant tracking design approach is illustrated on a two stage chemical reactor system with delayed recycle streams. (C) 2016 Elsevier Ltd. All rights reserved.
机译:这项研究涉及一类不确定的非线性系统的鲁棒自适应模糊容错控制问题,该系统具有不匹配的参数不确定性,外部干扰,多状态时滞扰动和执行器故障,其中包括有效性损失,停电和卡死模式。提出了一种新颖的直接自适应模糊跟踪控制方案,以达到容错控制的目的。首先,通过引入正非线性控制增益函数,可以有效地补偿状态时间延迟和执行器故障的影响。然后,构建一个合适的模糊逻辑系统(FLS),用于近似对应的非线性函数,以消除对不匹配参数不确定性和外部干扰的影响。此外,通过Lyapunov-Krasovskii稳定性分析表明,所有闭环系统信号均一地有界,并且跟踪误差收敛到原点的一小部分。最后,在具有延迟循环流的两级化学反应器系统上,说明了所提出的自适应模糊容错跟踪设计方法。 (C)2016 Elsevier Ltd.保留所有权利。

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