Open AccessAn integral sliding mode fault tolerant control for a class of non‐linear Lipschitz systems
Author(s) -
Ashraf Muhammad Ammar,
Ijaz Salman,
Zou Yao,
Hamayun Mirza Tariq
Publication year - 2020
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/cth2.12050
Subject(s) - control theory (sociology) , integral sliding mode , lipschitz continuity , actuator , controller (irrigation) , linear matrix inequality , fault tolerance , fault (geology) , computer science , sliding mode control , control (management) , mathematics , mathematical optimization , nonlinear system , mathematical analysis , distributed computing , physics , quantum mechanics , artificial intelligence , seismology , agronomy , biology , geology
This paper proposes an active fault‐tolerant control (FTC) strategy for a class of non‐linear Lipschitz systems. The proposed FTC approach employs the integral sliding mode control (ISMC) technique due to its inherent capability of dealing with system uncertainties. First, under the nominal fault‐free condition, the linear matrix inequality technique is introduced to design the primary controller for the non‐linear Lipschitz system. To accommodate the actuator faults/failures, the ISMC law is combined with a control allocation scheme that distributes the control signals to the redundant actuators. A non‐linear octorotor system is then used as a test bench to validate the tolerance performance of the proposed FTC strategy. In particular, the proposed FTC strategy is applied for the inner‐loop control, while in the outer loop, a fractional‐order control approach is used to achieve the precise longitude and latitude control. Finally, various simulations are performed to justify the effectiveness of the proposed control scheme.