Abstract
This paper studies the fault tolerant control, adaptive approach, for linear time-invariant two-time-scale and three-time-scale singularly perturbed systems in presence of actuator faults and external disturbances. First, the full order system will be controlled using ε-dependent control law. The corresponding Lyapunov equation is ill-conditioned due to the presence of slow and fast phenomena. Secondly, a time-scale decomposition of the Lyapunov equation is carried out using singular perturbation method to avoid the numerical stiffness. A composite control law based on local controllers of the slow and fast subsystems is also used to make the control law ε-independent. The designed fault tolerant control guarantees the robust stability of the global closed-loop singularly perturbed system despite loss of effectiveness of actuators. The stability is proved based on the Lyapunov stability theory in the case where the singular perturbation parameter is sufficiently small. A numerical example is provided to illustrate the proposed method.
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Adel Tellili graduated from the Technical University of Karlsruhe, Germany in 1994. He received the M. Sc. degree in automation from National School of Engineers of Sfax (ENIS), Tunisia in 2003, and the Ph.D. degree from the same school in 2007. He is currently an assistant professor at Higher Institute of Technological Studies, Tunisia. He is a member of the research unit Modeling, Analysis and Control of Systems (MACS).
His research interests include singularly perturbed systems, fault diagnosis and fault tolerant control.
Nouceyba Abdelkrim graduated from the National School of Engineers, Tunisia in 2009. She received the M. Sc. degree from the same school in 2011, and the Ph.D. degree from the same school in 2014. She is currently an assistant at Higher Institute of Industrial Systems of Gabes, Tunisia. She is a member of the research unit Modeling, Analysis and Control of Systems (MACS).
Her research interests include fault tolerant control, fault diagnosis, singularly perturbed systems and delayed systems.
Amina Challouf graduated from the National School of Engineers, Tunisia in 2006. She received the M. Sc. degree from the same school in 2008, and the Ph.D. degree from the same school in 2015. She is currently an assistant at Higher Institute of Industrial Systems of Gabes, Tunisia. She is a member of the research unit Modeling, Analysis and Control of Systems (MACS).
Her research interests include fault tolerant control, fault diagnosis and interconnected systems.
Mohamed Naceur Abdelkrim graduated from High School of Technical Education of Tunis, Tunisia in 1980. He received the M. Sc. degree from the same school in 1981 and the Ph.D. degree and “State Doctorate thesis” from the National School of Engineers of Tunis, Tunisia in 1984 and 2003. He is currently a professor of automatic control at the National School of Engineers of Gabes, Tunisia. He is also the head of the research unit Modeling, Analysis and Control of Systems (MACS).
His research interests include robust control, fault tolerant control and singularly perturbed systems.
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Tellili, A., Abdelkrim, N., Challouf, A. et al. Adaptive Fault Tolerant Control of Multi-time-scale Singularly Perturbed Systems. Int. J. Autom. Comput. 15, 736–746 (2018). https://doi.org/10.1007/s11633-016-0971-9
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DOI: https://doi.org/10.1007/s11633-016-0971-9