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Output Feedback Hybrid Force/Motion Control for Robotic Manipulators Interacting with Unknown Rigid Surfaces

Published online by Cambridge University Press:  22 April 2019

Alejandro Gutiérrez–Giles*
Affiliation:
Department of Electrical Engineering and Information Technology, CREATE Consortium and Prisma Laboratory, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
Marco Arteaga–Pérez
Affiliation:
Departamento de Control y Robótica, DIE, Facultad de Ingeniería, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico. E-mail: marteagp@unam.mx
*
*Corresponding author. E-mail: giles.gutierrez@unina.it
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Summary

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The problem of hybrid force and motion control over unknown rigid surfaces when only joint position measurements are available is considered. To overcome this problem, an extended state high-gain observer is designed to simultaneously estimate the contact force and joint velocities. These estimated signals are in turn employed to design a local estimator of the unknown surface gradient. This gradient is utilized to decompose the task space into two orthogonal subspaces: one for force tracking and the other one for motion control. A simple position Proportional Integral Derivative (PID) and force Proportional Integral (PI) controllers are proposed to track the desired signals. Finally, a mathematical analysis of the closed-loop dynamics is carried out, guaranteeing uniform ultimate boundedness of the position and force tracking errors and of the surface gradient estimation error. A numerical simulation is employed to validate the approach in an ideal scenario, while experiments are carried out to test the proposed strategy when uncertainties and unmodeled dynamics are present.

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Type
Articles
Copyright
© Cambridge University Press 2019