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An adaptive controller for nonlinear teleoperators with variable time-delays
Sarras, Ioannis; Nuño, Emmanuel; Basañez Villaluenga, Luis
Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial; Universitat Politècnica de Catalunya. SIR - Robòtica Industrial i Servei
In most real-life bilateral teleoperators the available physical parameters are uncertain and the communications exhibit variable time-delays. In order to confront these situations and only assuming that a bound of the time-delays is known, the present work reports an adaptive controller which ensures asymptotic convergence of both position errors and velocities to zero, provided that a sufficient condition on the control gains is met. Compared to previous related works that only treated constant time-delays, the stability analysis does not rely on the cascade interconnection structure of the local and remote nonlinear dynamics and the linear interconnection map. Instead, the paper employs a different Lyapunov candidate function that incorporates a strictly positive term, the local and remote position error. Some simulations, in free space and interacting with a rigid wall, and experiments, using two nonlinear manipulators, illustrate the performance of the proposed control scheme in the presence of uncertain parameters and variable time-delays. (C) 2014 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.
Àrees temàtiques de la UPC::Informàtica::Robòtica
Mobile robots -- Automatic control
BILATERAL TELEOPERATION
SYNCHRONIZATION
TRACKING
SYSTEMS
Robots mòbils -- Control automàtic
info:eu-repo/semantics/publishedVersion
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