Open AccessAdaptive fault‐tolerant robust control for a linear system with adaptive fault identification
Author(s) -
Shen Yi,
Liu Lijun,
Dowell Earl H.
Publication year - 2013
Publication title -
iet control theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.059
H-Index - 108
eISSN - 1751-8652
pISSN - 1751-8644
DOI - 10.1049/iet-cta.2012.0696
Subject(s) - control theory (sociology) , robustness (evolution) , actuator , adaptive control , fault tolerance , robust control , computer science , control engineering , fault (geology) , control system , engineering , control (management) , artificial intelligence , distributed computing , biochemistry , chemistry , seismology , geology , electrical engineering , gene
An integrated design of the adaptive robust control and the fault identification for a linear system with actuator faults is proposed. When actuators suffer from unpredicted faults, the proposed control strategy can track the actuator fault parameters adaptively without any prior fault information, and guarantee the robustness of the faulty system. An unknown input observer is designed to decouple the disturbance and the actuator faults. Then an adaptive control law with projection is presented to track the fault parameters. A new definition of robust H ∞ ‐like performance is proposed to ensure that the system is robust for both exogenous disturbance and unpredicted faults. Then the adaptive robust control law is designed to guarantee the system satisfying the robust H ∞ ‐like performance. Finally, the effectiveness of this control strategy is illustrated through the fault‐tolerant longitudinal control of the simplified F‐18 aircraft model.