Continuous fixed-time nonsingular terminal sliding mode control of second-order nonlinear systems with matched and mismatched disturbances

Document Type : Article

Authors

Faculty of Electrical and Computer Engineering, Malek Ashtar University of Technology, Tehran, P.O. Box 15875-1774, Iran

Abstract

This paper investigates fixed-time nonsingular terminal sliding mode control of second-order nonlinear systems in the presence of matched and mismatched disturbances. Using estimation of the mismatched disturbance estimated by a fixed-time disturbance observer, a novel nonlinear dynamic sliding surface is designed. This estimation is utilized in designing a completely novel nonlinear dynamics sliding surface whereby the fixed-time convergence of the sliding motion is guaranteed in spite of mismatched disturbance. The convergence time of the closed-loop system including disturbance observer and control system is guaranteed to be uniform with respect to initial conditions. Moreover, the proposed controller avoids chattering phenomenon by producing a continuous control signal.

Keywords

References

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Scientia Iranica
Volume 30, Issue 1
Transactions on Computer Science & Engineering and Electrical Engineering (D)
January and February 2023
Pages 142-153

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