Motion-copying system with variable impedance based on scaled bilateral control in one-degree-of-freedom robot

Takahiro Nozaki, Takahiro Mizoguchi, Kouhei Ohnishi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A motion-copying system is a kind of autonomous robotic system. This system reproduces human motion on the basis of haptic information (i.e., position and force information) extracted using a bilateral control system. However, in conventional motion-copying systems, control stiffness always remains constant. Thus, conventional systems show poor adaptability to differences in environmental locations during the reproduction phase. The objective of this study is to develop a motion-copying system with variable impedance. The proposed method includes an approach to determine the control stiffness of the motion-copying system on the basis of position, force, and impedance information. The haptic information is acquired using a scaled bilateral control system. For calculating the impedance, dynamic programming matching and the least-squares method are utilized. Dynamic programming matching accommodates the motion speeds in the saved data. The derived impedance is fed into a compliance control system, where it is reproduced. To validate the proposed method the task of removing a sarcoma is performed in experiments, in which three different types of target positions are set. The proposed motion-copying system succeeded in removing the sarcoma phantom, whereas the conventional method either failed to grasp it or applied excessive force. The proposed method succeeded in increasing the adaptability of the motion-copying system to different environmental locations.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalIEEJ Journal of Industry Applications
Volume3
Issue number1
DOIs
Publication statusPublished - 2014

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Copying
Robots
Control systems
Dynamic programming
Compliance control
Stiffness
Robotics
Experiments

Keywords

  • Acceleration-based bilateral control
  • Automated robot
  • Dynamic programming
  • Modal transformation
  • Motion-copying system
  • Real-world haptics

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Automotive Engineering
  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Mechanical Engineering

Cite this

Motion-copying system with variable impedance based on scaled bilateral control in one-degree-of-freedom robot. / Nozaki, Takahiro; Mizoguchi, Takahiro; Ohnishi, Kouhei.

In: IEEJ Journal of Industry Applications, Vol. 3, No. 1, 2014, p. 1-9.

Research output: Contribution to journalArticle

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