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research-article

Bilateral Adaptive Control of Nonlinear Teleoperation Systems with Uncertain Dynamics and Dead-zone

[+] Author and Article Information
Xia Liu

School of Electrical Engineering and Electronic Information, Xihua University, Chengdu, Sichuan 610039, China
xliu_uestc@yahoo.com

Mahdi Tavakoli

Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
mahdi.tavakoli@ualberta.ca

1Corresponding author.

ASME doi:10.1115/1.4040666 History: Received February 18, 2016; Revised June 24, 2018

Abstract

Dead-zone is one of the most common hard nonlinearities ubiquitous in master-slave teleoperation systems, particularly in the slave robot joints. However, adaptive control techniques applied in teleoperation systems usually deal with dynamic uncertainty but ignore the presence of dead-zone. Dead-zone has the potential to remarkably deteriorate the transparency of a teleoperation system in the sense of position and force tracking performance or even destabilizing the system if not compensated for in the control scheme. In this paper, an adaptive bilateral control scheme is proposed for nonlinear teleoperation systems in the presence of both uncertain dynamics and dead-zone. An adaptive controller is designed for the master robot with dynamic uncertainties and another is developed for the slave robot with both dynamic uncertainties and unknown dead-zone. The two controllers are incorporated into the 4-channel bilateral teleoperation control framework to achieve transparency. The transparency and stability of the closed-loop teleoperation system is studied via a Lyapunov function analysis. Comparisons with the conventional adaptive control which merely deal with dynamic uncertainties in the simulations demonstrate the validity of the proposed approach.

Copyright (c) 2018 by ASME
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