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Fault diagnosis and fault‐tolerant control based on Laplace transform for nonlinear networked control systems with random delay
Author(s) -
Li Lifan,
Yao Lina,
Jin Haokun,
Zhou Jinglin
Publication year - 2019
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.4823
Subject(s) - control theory (sociology) , laplace transform , observer (physics) , nonlinear system , fault tolerance , controller (irrigation) , fault (geology) , computer science , frequency domain , mathematics , control (management) , artificial intelligence , mathematical analysis , distributed computing , physics , quantum mechanics , seismology , agronomy , biology , geology , computer vision
Summary Aiming at the problem of random delay for nonlinear networked control systems, a Laplace transform strategy is used to obtain the description of the random time‐delay block in the frequency domain in this paper and the equivalent system without delay can be obtained based on the output response expectation equivalent principle. Then, the fault diagnosis observer is designed to estimate the state and fault of the equivalent system simultaneously. The fault‐tolerant controller based on PI control algorithm and adaptive compensation is designed. Both the observer gain and fault tolerance controller gain are obtained by solving the linear matrix inequalities. Finally, the validity of the proposed method is verified by the simulation and experiment results.