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An adaptive controller for nonlinear teleoperators
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DOI：10.1016/j.automatica.2009.10.026.png)
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Abstract
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In Chopra et al (2008) [Chopra, N., Spong, M. W., & Lozano, R. (2008). Synchronization of bilateral teleoperators with time-delay. Automatica, 44(8), 2142-2148], an adaptive controller for teleoperators with time-delays, which ensures synchronization of positions and velocities of the master and slave manipulators, and does not rely on the use of the ubiquitous scattering transformation, is proposed. In this paper it is shown that this controller will tend to drive to zero the positions of the joints where gravity forces are non-zero. Hence, the scheme is, in general, applicable only to systems without gravity. We also prove in this paper that this limitation can be obviated, replacing the positions and velocities - that are used in the coordinating torques and the adaptation laws - by their errors. Simulation results illustrate the performance of both schemes. (C) 2009 Elsevier Ltd. All rights reserved.
Keywords:
Adaptive control
Robot teleoperation
Synchronization
Time-delay
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