Citation: | YANG Lingyao, ZHANG Aihua, XU Jinlong, ZHANG Zhongjie. Trajectory tracking control of Mecanum wheel omnidirectional mobile robot based on power reaching law[J]. Journal of Shanghai University of Engineering Science, 2022, 36(1): 23-30. doi: 10.12299/jsues.21-0195 |
Aiming at problems of slow convergence and long time consuming in trajectory tracking, and chattering problem exists in the control of Mecanum wheel omnidirectional mobile robot based on general sliding mode, a sliding mode control method was proposed to realize the rapid convergence of the system by using the multi power reaching law. The position change of three degrees of freedom of robot was realized by controlling the angular velocity of four Mecanum wheels, and the control of three inputs and four outputs was completed. According to the mathematical model established, the multi power reaching law was used to adjust the convergence speed at different stages of the system approaching sliding mode surface, and the hyperbolic tangent function was used to replace the sign function in the reaching law to improve the chattering problem. The stability of the three inputs and four outputs control system was proved by Lyapunov theory. Finally, the control effect of the proposed algorithm was illustrated by simulation and comparison analysis.
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