• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (7): 93-102.doi: 10.3901/JME.2022.07.093

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Accurate Tracking Control of Magnetoelastic Elastic Miniature Swimmer under External Disturbance and Complex Path

XIANG Hongbiao1,2, CHENG Xu1,2, LI Mengwei1,2, WANG Shoujun1,2, ZHANG Mian1,2, HUANG Xian3, HUO Wenxing3   

  1. 1. Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, Tianjin University of Technology, Tianjin 300384;2. National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin 300384;3. School of Precision Instruments & Opto-Electronics Engineering, Tianjin University, Tianjin 300372
  • Received:2021-08-02 Revised:2021-11-04 Online:2022-04-05 Published:2022-05-20

Abstract: A millimeter-scale miniature swimming robot is designed based on magnetoelastic composite material. In order to realize the cable-less driven for the swimmer, spatial uniform magnetic fields are set up through 3D Helmholtz coils. The motion posture of the swimmer is changed by time-varying rotating magnetic field, so as to realize the swimming action of the robot. The structure and production process of the swimmer is introduced, and the simulation model is established based on Abaqus. Comparing finite element simulation and experimental results, the swimming characteristics of the robot are analyzed, and the influence of the frequency and strength of magnetic field on the swimming velocity is discussed. Furthermore, a modified line-of-sight navigation control method is adopted to improve the anti-disturbance ability of the swimmer, and a velocity fuzzy adaptive algorithm and head-to-tail switch control are proposed to realize the high accurate tracking of the complex path. The experimental results show that the proposed algorithm can overcome the disadvantages of the conventional line-of-sight navigation control with uniform velocity, such as missing of waypoints and the inability to relocate the path under certain situations, etc., and can reduce the error of path following. This work may provide a new idea for the precise control of the magnetic miniature swimmer.

Key words: miniaturized swimmer, magnetic control, magnetoelastic composite material, fuzzy adaptive control, path following

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