A Decentralized Force Controller Synthesis for Compliant Robots Driven by Series Elastic Actuators

Emre Sariyildiz, Rahim Mutlu, Takahiro Nozaki, Toshiyuki Murakami

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

Abstract

This paper deals with the decentralized force control problem of compliant robots driven by Series Elastic Actuators (SEAs). The decentralized force control problem of a compliant robot manipulator is transformed into the robust position control problem of a servo system by using Hooke's law and lumping the nonlinear dynamics and unknown disturbances of the robot manipulator into a fictitious disturbance variable. In order to precisely follow the reference force trajectories at joint space, i.e., the position trajectories of the servo systems, the robust controller is synthesized by using Disturbance Observer (DOb) and Sliding Mode Control (SMC). Although the robust force controller can be synthesized by using only SMC, the force control signal may suffer from high control signal chattering as the force reference input is increased. In addition to improving the robustness of force control, DOb significantly suppresses the discontinuous control signal chattering by allowing to decrease the SMC gain. When the proposed decentralized robust force controller is implemented, the compliant robot can precisely track desired force trajectories and safely contact to different environments. The validity of the proposed force controller is verified by giving the simulation results of a redundant robot manipulator.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages661-666
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

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Keywords

  • Compliant Robot
  • Decentralized Force Control
  • Disturbance Observer
  • Robust Force Control
  • Series Elastic Actuator
  • Sliding Mode Control

ASJC Scopus subject areas

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

Cite this

Sariyildiz, E., Mutlu, R., Nozaki, T., & Murakami, T. (2019). A Decentralized Force Controller Synthesis for Compliant Robots Driven by Series Elastic Actuators. In Proceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019 (pp. 661-666). [8722923] (Proceedings - 2019 IEEE International Conference on Mechatronics, ICM 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICMECH.2019.8722923