Bilateral Control between Manipulators with Different Structure Considering Fluctuation of Equivalent Mass Matrix

Wanping Lyu, Toshiyuki Murakami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposes the bilateral control method for a pair of manipulators which have different structures considering the fluctuation of an equivalent mass matrix. Bilateral control is one of the methods that controls position and force bidirectionally between two actuators. By using this method, operators can get haptic sensation from the remote environment during teleoperation. When considering the practical situation, the desired structure of robots would be different between the operator and remote sides depending on a task or environment. Therefore, bilateral control between two manipulators with different structure needs to be considered. In the method using Workspace Observer (WOB), conventionally, the nominal value is used for the equivalent mass matrix. However, an error occurs between the nominal and true values of equivalent mass matrix, and this error deteriorates the stability or noise-sensitivity of the system. In addition, it deteriorates the accuracy of the force estimation since Workspace Reaction Force Observer (WRFOB) estimates external force including this error. To overcome this problem, the control system needs to be designed based on the equivalent mass, which fluctuates depending on the posture of manipulators. By using the estimated equivalent mass matrix for WOB, the mass fluctuation can be considered, however, the interference between position control and force control occurs as the equivalent mass is different between the master and slave. Therefore, in the proposed method, Modal space Disturbance Observer (MDOB) with estimated task mass matrix is used to reduce the interference. Experiments were conducted to validate the proposed method.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages370-375
Number of pages6
ISBN (Electronic)9781538669594
DOIs
Publication statusPublished - 2019 May 24
Event2019 IEEE International Conference on Mechatronics, ICM 2019 - Ilmenau, Germany
Duration: 2019 Mar 182019 Mar 20

Publication series

NameProceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019

Conference

Conference2019 IEEE International Conference on Mechatronics, ICM 2019
CountryGermany
CityIlmenau
Period19/3/1819/3/20

Keywords

  • bilateral control
  • modal transformation
  • motion control
  • teleoperation
  • workspace observer

ASJC Scopus subject areas

  • Artificial Intelligence
  • Human-Computer Interaction
  • Automotive Engineering
  • Mechanical Engineering
  • Control and Optimization
  • Industrial and Manufacturing Engineering

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  • Cite this

    Lyu, W., & Murakami, T. (2019). Bilateral Control between Manipulators with Different Structure Considering Fluctuation of Equivalent Mass Matrix. In Proceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019 (pp. 370-375). [8722935] (Proceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICMECH.2019.8722935