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Simplified global fault accommodation control design of uncertain nonlinear systems with unknown time-varying powers

  • Sung Jin YooEmail author
Original paper
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Abstract

This paper addresses the problem of global robust fault accommodation tracking for a class of uncertain nonlinear systems with unknown powers and actuator faults. It is assumed that the powers of the concerned system are unknown time-varying functions, all system nonlinearities are unknown, and unknown actuator faults depend on the time-varying power of a control input. A fault accommodation state-feedback controller is explicitly constructed based on the nonlinear error transformation technique using time-varying performance functions. Global tracking with the preselected performance bounds is established in the presence of unknown time-varying powers and unexpected actuator faults. Different from the previous results dealing with the problem of unknown time-varying powers, the proposed tracking strategy does not require the knowledge of the bounds of the time-varying powers and the nonlinear bounding functions of system nonlinearities. An underactuated mechanical system is simulated to validate the effectiveness of the proposed theoretical approach.

Keywords

Global fault accommodation tracking Unexpected faults Unknown time-varying powers Low-complexity design Guaranteed tracking performance 

Notes

Acknowledgements

This research was supported by the Human Resources Development (No. 20174030201810) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy, and by the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2019R1A2C1004898).

Compliance with ethical standards

Conflict of interest

The author declares that he has no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.School of Electrical and Electronics EngineeringChung-Ang UniversitySeoulRepublic of Korea

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