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JRM Vol.29 No.3 pp. 557-565
doi: 10.20965/jrm.2017.p0557
(2017)

Paper:

Views over last 60 days: 1,630

Real-Time Estimation of Sensorless Planar Robot Contact Information

Zhiguang Liu, Fei Yu, Liang Zhang, and Tiejun Li

School of Mechanical Engineering, Hebei University of Technology
Tianjin, 300130, China

Received:
June 21, 2016
Accepted:
January 10, 2017
Published:
June 20, 2017
Creative Commons License
Keywords:
external joint torques, contact range, optimization, contact detection
Abstract
The real-time estimation of sensorless planar robot contact information is a very important but also difficult subject in human-robot interaction. This paper proposes a method for the real-time estimation of contact location and contact force along a planar joint robot manipulator without using external sensory systems. A momentum-based method is used to estimate external joint torques due to the contact force and to determine a minimum contact range firstly. A nonlinear constrained optimization algorithm is presented to search the contact point. The contact force is calculated by dynamics. The searching space determined by the momentum-based approach is limited within the length range of the contact arm, so the solution speed of the optimization algorithm is high. The proposed method of combining observation algorithm and optimization algorithm transforms a complex detection problem of the any contact point on the robot body into a simple one-dimensional optimization solution with simple bound. The effectiveness of the proposed approach is validated through simulations and experimental results for the planar robot manipulator.
Estimation of robot contact information

Estimation of robot contact information

Cite this article as:
Z. Liu, F. Yu, L. Zhang, and T. Li, “Real-Time Estimation of Sensorless Planar Robot Contact Information,” J. Robot. Mechatron., Vol.29 No.3, pp. 557-565, 2017.
Data files:
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Last updated on Dec. 13, 2024