Abstract
In this paper, a new fractional order exponential type reaching law (FOE-RL) is presented for the uncertain discrete-time system. The FOE-RL is constructed by adopting the exponential term and the Grünwald-Letnikov fractional order (FO) calculus of the switching function and the sign function. Compared to the integer order reaching laws (IO-RLs), the proposed reaching law is capable of regulating the system trajectory converging to a specified band whose width can be smaller than the upper bound of change rate of the disturbance and even approach zero. Hence, the proposed method has the ability to further suppress chattering and enhance the control accuracy compared to other reaching law strategies. The decrement band and the quasi-sliding mode domain (QSMD) of the uncertain system are analyzed. The sliding surface can be reached in finite steps, even though the system is suffering from uncertainties and disturbances. Numerical simulation examples are given to testify the validity of the presented method.
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Recommended by Editor Hamid Reza Karimi. This work is supported by the National Science Foundation of China under Grant (51805327, 51575544), by the Hong Kong Scholars Program under Grant (XJ2017022), the research committee of the Hong Kong Polytechnic University under Grant (G-YZ1G, 1-ZE97), and in part by Tianjin Natural Science Foundation (16JCZDJC38000).
Haifeng Ma received his B.E. and M.E. degrees in mechanical engineering from Southwest Jiaotong University, Chengdu, China, in 2010 and 2013, respectively, and his Ph.D. degree in mechatronics from Shanghai Jiao Tong University, Shanghai, China, in 2017. He is currently working at the Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan, China. He is also a “Hong Kong Scholar” and a postdoctoral fellow in The Hong Kong Polytechnic University, Kowloon, Hong Kong, China. His research interests include sliding-mode control (SMC) theory and applications, vibration control and intelligent manufacturing.
Yangmin Li received his B.S. and M.S. degrees from Jilin University, Changchun, China, in 1985 and 1988, respectively, and his Ph.D. degree from Tianjin University, Tianjin, China, in 1994, all in mechanical engineering. He is currently a Full Professor of the Department of Industrial and Systems Engineering of The Hong Kong Polytechnic University. He has authored and coauthored 420 scientific papers in journals and conferences. His research interests include micro/nanomanipulation, compliant mechanism, precision engineering, robotics, multibody dynamics and control. Dr. Li is a Member of the ASME. He is an Associate Editor of the IEEE Trans. Auto. Sci. Eng., Associate Editor of Mechatronics, Associate Editor of the International Journal of Control, Automation, and Systems, and Associate Editor of IEEE Access.
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Ma, H., Li, Y. Fractional Order Exponential Type Discrete-time Sliding Mode Control. Int. J. Control Autom. Syst. 18, 374–383 (2020). https://doi.org/10.1007/s12555-018-0898-8
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DOI: https://doi.org/10.1007/s12555-018-0898-8