Robust Stability of Scaled-Four-Channel Teleoperation with Internet Time-Varying Delays
Identifieur interne : 004199 ( Ncbi/Curation ); précédent : 004198; suivant : 004200Robust Stability of Scaled-Four-Channel Teleoperation with Internet Time-Varying Delays
Auteurs : Emma Delgado ; Antonio Barreiro ; Pablo Falc N ; Miguel Díaz-CachoSource :
- Sensors (Basel, Switzerland) [ 1424-8220 ] ; 2016.
Abstract
We describe the application of a generic stability framework for a teleoperation system under time-varying delay conditions, as addressed in a previous work, to a scaled-four-channel (γ-4C) control scheme. Described is how varying delays are dealt with by means of dynamic encapsulation, giving rise to mu-test conditions for robust stability and offering an appealing frequency technique to deal with the stability robustness of the architecture. We discuss ideal transparency problems and we adapt classical solutions so that controllers are proper, without single or double differentiators, and thus avoid the negative effects of noise. The control scheme was fine-tuned and tested for complete stability to zero of the whole state, while seeking a practical solution to the trade-off between stability and transparency in the Internet-based teleoperation. These ideas were tested on an Internet-based application with two Omni devices at remote laboratory locations via simulations and real remote experiments that achieved robust stability, while performing well in terms of position synchronization and force transparency.
Url:
DOI: 10.3390/s16050593
PubMed: 27128914
PubMed Central: 4883284
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<author><name sortKey="Diaz Cacho, Miguel" sort="Diaz Cacho, Miguel" uniqKey="Diaz Cacho M" first="Miguel" last="Díaz-Cacho">Miguel Díaz-Cacho</name>
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<front><div type="abstract" xml:lang="en"><p>We describe the application of a generic stability framework for a teleoperation system under time-varying delay conditions, as addressed in a previous work, to a scaled-four-channel (γ-4C) control scheme. Described is how varying delays are dealt with by means of dynamic encapsulation, giving rise to mu-test conditions for robust stability and offering an appealing frequency technique to deal with the stability robustness of the architecture. We discuss ideal transparency problems and we adapt classical solutions so that controllers are proper, without single or double differentiators, and thus avoid the negative effects of noise. The control scheme was fine-tuned and tested for complete stability to zero of the whole state, while seeking a practical solution to the trade-off between stability and transparency in the Internet-based teleoperation. These ideas were tested on an Internet-based application with two Omni devices at remote laboratory locations via simulations and real remote experiments that achieved robust stability, while performing well in terms of position synchronization and force transparency.</p>
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