Finite-time robust performance improvement for non-linear systems in the presence of input non-linearity and external disturbance

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Publication Details

Author list: Wang, Haoping; Ghaffari, Valiollah; Mobayen, Saleh; Bartoszewicz, Andrzej; Fekih, Afef; Assawinchaichote, Wudhichai;

Publisher: Wiley Open Access

Publication year: 2023

Journal: IET Control Theory and Applications (1751-8644)

Volume number: 17

Issue number: 6

Start page: 672

End page: 682

Number of pages: 11

ISSN: 1751-8644

eISSN: 1751-8652

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85141451980&doi=10.1049%2fcth2.12387&partnerID=40&md5=78be2794cd55f0d982a8990056b51530

Languages: English-Great Britain (EN-GB)

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Abstract

The main focus of this research is on improving the performance of dynamic systems with actuator non-linearities and time-varying disturbances. To this end, using the concept of finite-time stability, a novel observer is presented to estimate the disturbances in systems with input non-linearities. Then, introducing an innovative sliding manifold, a robust observer-based technique is derived to guarantee the finite-time stability of the sliding surface. Hence, the closed-loop system would be stable in the presence of hard non-linearities and time-varying disturbances. The performance of the proposed approach was assessed in using a simulation study of two numerical examples. The obtained results and comparison with a conventional method confirmed the benefits of the suggested approach. © 2022 The Authors. IET Control Theory & Applications published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

Keywords

external disturbance, input non-linearity, robust controller