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

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Khanzadeh A.; Mohammadzaman I.

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Journal Paper

Paper Information

Journal: SCIENTIA IRANICA Year:2023 | Volume:30 | Issue:1 (Transactions D: Computer Science and Engineering and Electrical Engineering) Page(s): 142-153

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Information Journal Paper

Title

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

Author(s)

Khanzadeh A. | Mohammadzaman I. | Issue Writer Certificate

Keywords

Fixed-time stability

nonsingular terminal sliding mode

Second-order systems

Mismatched disturbance

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.

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