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        UIO-based Fault Estimation and Accommodation for Nonlinear Switched Systems

        Haoshuang Chen,Dongsheng Du,Dewen Zhu,Yan Yang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2

        This paper investigates the problems of fault estimation and fault accommodation for a class of nonlinearswitched systems. First, an augmented switched system is constructed by forming an augmented state vectorcomposed of the state vector and the fault vectors. Then, an unknown input observer (UIO) is designed for theaugmented switched system to estimate the augmented state vector. With the assist of the average dwell-time(ADT) method and the switched Lyapunov function technique, sufficient conditions are obtained to guarantee thatthe error system is globally uniformly asymptotically stable (GUAS) with a prescribed H∞ performance index. Analgorithm is provided to show the procedures on how to design the UIO. Moreover, the results are extended to themeasurement disturbances case. Based on signal compensation principle, a dynamic output feedback controller isdesigned to ensure the asymptotical stability of the closed-loop system. Finally, simulation results are presented todemonstrate the proposed technique.

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