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Sliding Mode Robust Control of Hydraulic Drive Unit of Hydraulic Quadruped Robot

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Abstract

This paper focuses on the position control of the quadruped robot hydraulic drive unit (HDU). The proposed control strategy has the advantages of excellent output tracking performance, strong robustness, no chattering and low computational complexity. HDU has the characteristics of nonlinearity and parameter uncertainty, coupled with unpredictable external interference, which makes it difficult to achieve precise position control. In this paper, we first establish the mathematical model of the HDU based on the actual parameters and obtain the state space of the system. Through the pole placement, the simplified system can easily achieve the expected control goal. Then, the state equation of the error system is constructed, and the nonlinearity, parameter uncertainty and external interference of the HDU are summarized as the matched and unmatched uncertainties of the system. The integral sliding mode control (ISMC) is used to derive the control law, and the response characteristics of the system when pole placement and state feedback H control are used for the nominal control are compared. It can be concluded that the system with state feedback H control for nominal control has stronger robustness and can resist the unmatched uncertainties. Finally, the control law of the simplified system is used as feedforward and combined with the ISMC of the error system, the output tracking control framework of the HDU is proposed. Simulations and experiments show that the proposed control method has excellent tracking performance and strong robustness.

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Correspondence to Qingjun Yang.

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Rui Zhu received his B.S. degree in mechanical engineering from Taiyuan University of Technology, China, in 2017. He is currently pursuing a Ph.D. degree in mechatronics engineering from Harbin Institute of Technology, China. His research interests include quadruped robot, electrohydraulic servo control, and nonlinear control.

Qingjun Yang received his B.S., M.S., and Ph.D. degrees in mechatronics engineering from Harbin Institute of Technology, China, in 1995, 1997, and 2003, respectively. He has been with the mechatronics engineering at Harbin Institute of Technology since 2003 and promoted to the rank of associate professor in 2006. His research interests include fluid control and flow field analysis, hydraulic and pneumatic components design, nonlinear control, and adaptive control.

Yudong Liu received his M.S. degree in mechatronics engineering from Harbin Institute of Technology, China, in 2019, and received a B.S. degree in mechanical engineering from Yanshan University, China, in 2017. He is currently pursuing a Ph.D. degree in mechatronics engineering from Harbin Institute of Technology. His research interests include hydraulic components and systems and electro-hydraulic control.

Rizhi Dong received his M.S. degree in mechatronics engineering from Northeast Petroleum University, China, in 2018, and received a B.S. degree in mechanical engineering from Northeast Petroleum University, China, in 2015. He is currently pursuing a Ph.D. degree in mechatronics engineering from Harbin Institute of Technology. His research interests include hydraulic components and systems and fluid machinery.

Chunli Jiang received her B.S. degree in mechatronics Engineering from Hefei University of Technology, China, in 2020. She is currently pursuing an M.S. degree in mechatronics engineering from Harbin Institute of Technology. Her research interests include electro-hydraulic control and microfluidic.

Jiaxing Song received her M.S. degree in mechatronics engineering from Harbin Institute of Technology, China, in 2019, and received a B.S. degree in mechanical engineering from Taiyuan University of Technology, China, in 2017. She works in China Aerospace Science & Industry Nanjing Chenguang Group as an electrical engineer at present. Her research interests include servo valve driver by piezoelectric ceramic and hydraulic control system.

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Zhu, R., Yang, Q., Liu, Y. et al. Sliding Mode Robust Control of Hydraulic Drive Unit of Hydraulic Quadruped Robot. Int. J. Control Autom. Syst. 20, 1336–1350 (2022). https://doi.org/10.1007/s12555-021-0235-5

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