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Nonlinear bilateral teleoperators under event‐driven communication with constant time delays

Summary Bilateral teleoperation systems provide a platform for human operators to remotely manipulate slave robots in engaging various tasks in remote environments. Most of the previous studies in bilateral teleoperation were developed under continuous transmission or periodic communication with fix...

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Published in:International journal of robust and nonlinear control 2019-07, Vol.29 (11), p.3547-3569
Main Authors: Liu, Yen‐Chen, Hu, Shin‐Chen
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Language:English
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Hu, Shin‐Chen
description Summary Bilateral teleoperation systems provide a platform for human operators to remotely manipulate slave robots in engaging various tasks in remote environments. Most of the previous studies in bilateral teleoperation were developed under continuous transmission or periodic communication with fixed data exchanging rates. This paper presents control schemes for bilateral teleoperation systems using nonperiodic event‐driven communication. By using P‐like and PD‐like controllers, this study proposes triggering conditions for teleoperators to reduce network access frequency so that robots only transmit output signals when necessary. Stability and position tracking of the control system are studied, and nonzero minimum interevent time is guaranteed. The proposed event‐driven teleoperation is studied with a velocity estimator to avoid the requirement of velocity information in the controller and triggering condition. Without velocity measurements, the boundedness of tracking errors and stability are ensured for teleoperation systems under event‐driven communication. Simulations and experiments are illustrated to validate the performance of the proposed event‐driven teleoperation systems.
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subjects bilateral teleoperation
Communication
Control stability
event‐driven communication
position coordination
Robots
Teleoperators
time delay
Tracking control
Tracking errors
velocity estimation
title Nonlinear bilateral teleoperators under event‐driven communication with constant time delays
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