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Fuzzy-approximation adaptive fault-tolerant control for nonlinear pure-feedback systems with unknown control directions and sensor failures

机译:具有未知控制方向和传感器故障的非线性纯反馈系统的模糊近似自适应容错控制

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摘要

In this paper, the problem of adaptive fuzzy fault-tolerant control (FTC) is investigated for a class of nonlinear pure-feedback systems with unknown control directions and sensor failures. By utilizing the mean value theorem, the considered nonlinear pure-feedback system is transformed into a strict-feedback structure. The unavailability of state variables caused by sensor faults is dealt with by using parameter separation and regrouping technique. Based on cancelation and decoupled backstepping technique, an adaptive fuzzy fault-tolerant control method is developed. It is proved that the proposed adaptive FTC scheme can guarantee the exponential stabilization of the resulting closed-loop system. Furthermore, all the signals of the system remain semi-global uniformly ultimately bound (SGUUB). The simulation results are provided to illustrate the effectiveness of the proposed control scheme. (C) 2018 Elsevier B.V. All rights reserved.
机译:针对一类具有未知控制方向和传感器故障的非线性纯反馈系统,研究了自适应模糊容错控制(FTC)问题。通过使用平均值定理,将考虑的非线性纯反馈系统转换为严格的反馈结构。通过使用参数分离和重新组合技术来解决由于传感器故障而导致的状态变量不可用的问题。基于抵消和解耦后推技术,提出了一种自适应模糊容错控制方法。实践证明,所提出的自适应FTC方案可以保证所得闭环系统的指数稳定性。此外,系统的所有信号都保持半全局统一最终绑定(SGUUB)。提供仿真结果以说明所提出的控制方案的有效性。 (C)2018 Elsevier B.V.保留所有权利。

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