Abstract
In this article, a novel positive semi-definite barrier function based adaptive recursive terminal sliding mode control for a class of uncertain nonlinear systems with actuator saturation is proposed. The method explicitly considers the actuator saturation and uncertainty, and achieves high-speed and high-precision control of the system with a lower amplitude adaptive gain, while without require the knowledge of the upper bound of the disturbance. First, in order to avoid the singularity problem and effectively improve the tracking accuracy, an error-based adaptive recursive terminal sliding surface is constructed; Then, a positive semi-definite barrier function, which realizes the adaptive adjustment of the controller gain in a lower amplitude mode is considered. It ensures that the sliding variable converges to a predefined region even when it is in the presence of actuator saturation and external disturbance. In addition, in order to prevent the problem of excessive positive semi-definite barrier function gain caused by sudden large disturbances, a modified barrier function gain form which can vary with the disturbance amplitude is also proposed, therefore the overestimation of the gain which may be difficult to achieve in reality is effectively avoided; Finally, the stability analysis of the above two control strategies is carried out in detail, and it is proved that both the systematic error and its derivative can converge to a predefined region in finite time. Numerical simulations show that in the presence of actuator saturation and external disturbances, the proposed control method not only improve the convergence performance and the control accuracy of the system, but also better prevent actuator saturation. The proposed method is also applied to a multi-cylinder hydraulic press servo system, and the results show its effectiveness.
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This work was supported by the National Natural Science Foundation of China under grants 62103298 and the Natural Science Foundation of Tianjin under grants 18JCYBJC87700; and the Training plan for young and middle-aged backbone innovative talents in colleges and universities in Tianjin.
Chao Jia received his B.E. and M.E. degrees from Tianjin University of Technology, Tianjin, China, in 2002 and 2008, respectively, and a Ph.D. degree from Tianjin University, Tianjin, China, in 2013. He joined the School of Electrical and Electronic Engineering, Tianjin University of Technology, China, in 2002, becoming an Associate Professor in 2013. He was a Visiting Scholar with Columbia University, NY, USA, from 2016 to 2017. His current research interests include nonlinear control, adaptive control, repetitive control, as well as their applications.
Lijie Li received his B.S. degree in antomation from Nantong Institute of Technology, Nantong, in 2020, and an M.E. degree in electronic engineering and automation from the School of Electrical Engineering and Antomation, Tianjin University of Technology, Tianjin, China, in 2023, respectively. His research interests include sliding-mode control, barrier function, input saturation, and finite-time control.
Xuanyue Shangguan received his B.S. degree from Tianjin Chengjian University majoring in electrical engineering and automation, Tianjin, in 2021, which he is pursuing a master’s degree. His research interests include super-twisting algorithm, multi-agent system, and nonlinear control for multi-cylinder hydraulic press.
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Jia, C., Li, L. & Shangguan, X. Adaptive Recursive Terminal Sliding Mode Control for Uncertain Systems With Input Saturation Based on Positive Semi-definite Barrier Function. Int. J. Control Autom. Syst. (2024). https://doi.org/10.1007/s12555-023-0368-9
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DOI: https://doi.org/10.1007/s12555-023-0368-9