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A sliding-mode controller for dual-user teleoperation with unknown constant time delays

Published online by Cambridge University Press:  19 October 2012

Mahya Shahbazi ,
S. Farokh Atashzar ,
H. A. Talebi ,
F. Towhidkhah  and
M. J. Yazdanpanah
Mahya Shahbazi
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
S. Farokh Atashzar
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
H. A. Talebi*
Affiliation:
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
F. Towhidkhah
Affiliation:
Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
M. J. Yazdanpanah
Affiliation:
Department of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
*
*Corresponding author. E-mail: alit@aut.ac.ir
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Summary

In this paper, a control methodology is proposed for dual-user teleoperation system in the presence of unknown constant communication time delay. To satisfy dual-user system-desired objectives, three impedance characteristics are defined as the desired closed-loop system. In order to satisfy the desired impedance characteristics, a sliding-mode-based impedance controller is applied. The proposed controller affords unknown communication delay, an issue that is disregarded in the previous studies performed on dual-user systems. The nonlinear gain of the controller is achieved independent of time delay caused by communication channels. Therefore, the necessity of measurement or estimation of the time delay is relaxed. In addition, the stability analysis is presented for the closed-loop system using the passivity theory. The validity of the proposed controller scheme is demonstrated via experimental results performed on a dual-user system in the presence of unknown communication delay. In addition, due to lack of availability of forces corresponding to the operators’ hand that are required in the proposed controller, a Kalman Filter-based Force Observer (KFFO) is proposed.

Keywords

Dual-user systemTeleoperationSliding-mode controlMulti-master/single-slave systemUnknown time delay
Type
Articles
Information
Robotica , Volume 31 , Issue 4 , July 2013 , pp. 589 - 598
Copyright
Copyright © Cambridge University Press 2012 

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