Abstract
In this study, an adaptive neural backstepping control scheme is proposed for a class of nonstrict-feedback time-delay systems with input saturation, full-state constraints and unknown disturbances. A structural property of radial basis function neural network is presented to deal with the design from the nonstrict-feedback formation. This method does not require the parameter separation technique and its assumption. With the help of the Lyapunov-Krasovskii functionals and Young’s inequalities, the effects of time delays are compensated, and the unknown disturbances are eliminated in the design process. The barrier Lyapunov function (BLF) is applied to arrest the violation of the full-state constraints. To overcome the problem of input saturation nonlinearity, the smooth nonaffme function of the control input signal is adopted to approach the input saturation function. Moreover, an adaptive backstepping neural control strategy is proposed. The proposed adaptive neural controller ensures that all the closed-loop signals are semi-globally uniformly ultimately bounded (SGUUB). Furthermore, the tracking error can converge to a small neighborhood of the origin. The simulation result shows the effectiveness of this method.
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Recommended by Associate Editor Xiangpeng Xie under the direction of Editor PooGyeon Park. This work is supported in part by the Taishan Scholar Project of Shandong Province of China under Grant tsqn201812093.
Xin Liu received his B.Sc. degree in Electrical Engineering and Automation from University of Science and Technology Liaoning, Anshan, China, in 2015. He is currently pursuing an M.S. degree in Control Engineering with University of Science and Technology Liaoning, Anshan, China. His research interests include fuzzy control, adaptive control, and control of nonlinear time-delay systems.
Chuang Gao received his B.S. and M.S. degrees from Warwick University and King’s College London, UK, in 2005 and 2007, respectively. He is currently a Ph.D. candidate in University of Science and Technology Liaoning, China. He has authored over 10 research papers indexed by SCI and EI. His research interests include nonlinear system control, machine learning and intelligent control.
Huanqing Wang received his B.Sc. degree in mathematics from Bohai University, Jinzhou, China, in 2003, an M.Sc. degree in mathematics from Inner Mongolia University, Huhhot, China, in 2006, and a Ph.D. degree from the Institute of Complexity Science, Qingdao University, Qingdao, China, in 2013. He was a Post-Doctoral Fellow with the Department of Electrical Engineering, Lakehead University, Thunder Bay, ON Canada, in 2014, and was a Post- Doctoral Fellow with the Department of Systems and Computer Engineering, Carleton University, Ottawa, ON Canada. He has authored or co-authored over 50 papers in top international journals. His current research interests include adaptive backstepping control, fuzzy control, neural networks control, stochastic nonlinear systems. Dr. Wang serves as an Associate Editor for several journals, including Neural Computing and Applications, the International Journal of Control, Automation, and Systems, and the IEEE ACCESS.
Libing Wu received his B.S. and M.S. degrees in the Department of Mathematics from Jinzhou Normal College, Jinzhou, China, in 2004, and in Basic Mathematics from Northeastern University, Shenyang, China, in 2007, respectively, and a Ph.D. degree in Control Theory and Control Engineering from Northeastern University, Shenyang, China, in 2016. He is currently an Associate Professor at the School of Science, University of Science and Technology Liaoning, and also as a Postdoctoral Fellow at the Department of Electrical Engineering, Yeungnam University. His research interests include adaptive control, fault-tolerant control, nonlinear control and fault estimation.
Yonghui Yang received his B.Sc. degree in Computer Science, from Northeastern University, Shenyang, China, an M.Sc. degree in Electronic and Information Engineering and a Ph.D. degree in Chemical Engineering from University of Science and Technology Liaoning, Anshan, China, in 1995, 2010, and 2018, respectively. He is currently a Professor at the School of Electronic and Information Engineering, University of Science and Technology Liaoning, Anshan, China. His research interests include nonlinear control, intelligent process control, robot communication and control, and machine learning.
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Liu, X., Gao, C., Wang, H. et al. Adaptive Neural Tracking Control of Full-state Constrained Nonstrict-feedback Time-delay Systems with Input Saturation. Int. J. Control Autom. Syst. 18, 2048–2060 (2020). https://doi.org/10.1007/s12555-019-0479-5
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DOI: https://doi.org/10.1007/s12555-019-0479-5