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Force and Position–Velocity Coordination for Delayed Bilateral Teleoperation of a Mobile Robot

Published online by Cambridge University Press:  20 March 2019

E. Slawiñski ,
V. Moya ,
D. Santiago  and
V. Mut
E. Slawiñski*
Affiliation:
Instituto de Automática (INAUT), Universidad Nacional de San Juan, San Juan, Argentina. E-mails: vmoya@inaut.unsj.edu.ar, dsantiago@inaut.unsj.edu.ar, vmut@inaut.unsj.edu.ar
V. Moya
Affiliation:
Instituto de Automática (INAUT), Universidad Nacional de San Juan, San Juan, Argentina. E-mails: vmoya@inaut.unsj.edu.ar, dsantiago@inaut.unsj.edu.ar, vmut@inaut.unsj.edu.ar
D. Santiago
Affiliation:
Instituto de Automática (INAUT), Universidad Nacional de San Juan, San Juan, Argentina. E-mails: vmoya@inaut.unsj.edu.ar, dsantiago@inaut.unsj.edu.ar, vmut@inaut.unsj.edu.ar
V. Mut
Affiliation:
Instituto de Automática (INAUT), Universidad Nacional de San Juan, San Juan, Argentina. E-mails: vmoya@inaut.unsj.edu.ar, dsantiago@inaut.unsj.edu.ar, vmut@inaut.unsj.edu.ar
*
*Corresponding author. E-mail: slawinski@inaut.unsj.edu.ar
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Summary

This document proposes a control scheme for delayed bilateral teleoperation of a mobile robot, which it is sought to achieve a coordination of the master device position with the slave mobile robot velocity, and at the same time synchronize the force exerted by the operator with force applied by the environment over the mobile robot. This approach allows the operator to improve the sensitive perception of the remote environment in which the robot navigates while he generates commands to control the mobile robot motion. In this paper, variable and asymmetrical communication time delays are taken into account, as well as a non-passive model of the human operator, for which a novel model is proposed that has a more general structure than the typical ones used to date in the teleoperation field. Furthermore, based on the theoretical analysis presented, the state of convergence in the stationary response is obtained. In addition, an experimental performance evaluation is carried out, where the position–velocity error, force error and the time to complete the task are evaluated. In the tests, a human operator commands a remote mobile robot to push objects of different weight while he perceives the weight of each object through the force feedback system. As an outcome, the theoretical and practical results obtained allow concluding that a satisfactory trade-off between stability and transparency is reached.

Keywords

Bilateral teleoperationForce–velocity coordinationTime delayMobile robot
Type
Articles
Information
Robotica , Volume 37 , Issue 10 , October 2019 , pp. 1768 - 1784
Copyright
© Cambridge University Press 2019 

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