Journal of Computational Applied Mechanics

Fuzzy logic-based variable impedance control for a bilateral teleoperation system under time delay

Document Type : Research Paper

Authors

1 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

2 School of Mechatronic Systems Engineering, Faculty of Applied Sciences, Simon Fraser University, British Columbia, Canada

Abstract

In a delayed master-slave teleoperation system, if the slave robot interacts with a delicate and sensitive environment, it is essential to control the slave-environment interactions. Variable impedance control has been proposed as a useful method for this aim in the literature. However, changing the impedance parameters based on the system requirements imposes a complex process in the controller design. To address this issue, we propose a variable impedance control strategy for the slave side, where the impedance variables are changed using fuzzy logic. This is carried out based on the environment destruction threshold—defined based on the contact force and the velocity of the slave robot—and system stability range. The proposed method is simulated in MATLAB’s Simulink considering telesurgery conditions and soft tissue environment under an unknown and varying time delay. Simulation results show that the proposed method maintains the velocity of the slave robot and the environment force in the desired interval and performs better in keeping the environment safe compared to the constant-coefficient impedance control.

Keywords

Main Subjects

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Journal of Computational Applied Mechanics
Volume 55, Issue 3
June 2024
Pages 500-518
  • Receive Date: 02 December 2023
  • Revise Date: 09 January 2024
  • Accept Date: 10 January 2024