• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2020, Vol. 56 ›› Issue (5): 39-46.doi: 10.3901/JME.2020.05.039

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Deployment Dynamic Modelling and Adaptive Robust Control of Truss-shaped Deployable Grasping Mechanism

LI Guotao1,2, LI Bing1,2, GUO Hongwei1, HUANG Hailin1,2   

  1. 1. State Key Laboratory of Robotics and System(HIT), Harbin 150001;
    2. Department of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055
  • Received:2019-01-15 Revised:2019-05-24 Online:2020-03-05 Published:2020-04-23

Abstract: A dynamic modeling method for the deployment motion of a new type of truss-shaped deployable grasping mechanism is proposed, and a control strategy considering nonlinear factors, such as over-constraints, is designed to improve the motion performance. The truss-shaped deployable grasping mechanism is briefly introduced, and the dynamic model of the deployment motion of the mechanism is established by using Lagrangian mechanics and the recursive method. Using the known information of the dynamic model, an extended state observer is designed to estimate the dynamic part caused by the over-constraints in the mechanism. An improved adaptive robust controller based on extended state observer is proposed, where the inertia parameter of the mechanism is estimated by a discontinuous-projection-based adaptive control law, and the problem of the traditional adaptive robust controller is overcome by proposing an adaptive sliding mode control law. The experimental platform of deployable grasping mechanism is built, and the effectiveness of the proposed controller is verified in comparison with the existing state-of-the-art controllers.

Key words: deployable mechanism, over-constraint, dynamic modelling, extended state observer, adaptive robust control

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