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Robust position-based impedance control of lightweight single-link flexible robots interacting with the unknown environment via a fractional-order sliding mode controller

Published online by Cambridge University Press:  07 September 2018

Ali Fayazi Open the ORCID record for Ali Fayazi [Opens in a new window] ,
Naser Pariz ,
Ali Karimpour  and
Seyed Hassan Hosseinnia
Ali Fayazi
Affiliation:
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Naser Pariz*
Affiliation:
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Ali Karimpour
Affiliation:
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Seyed Hassan Hosseinnia
Affiliation:
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Department of Precision and Microsystems Engineering, Delft University of Technology, Delft, Netherlands
*
*Corresponding author. E-mail: [email protected]
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Summary

This paper presents a fractional-order sliding mode control scheme equipped with a disturbance observer for robust impedance control of a single-link flexible robot arm when it comes into contact with an unknown environment. In this research, the impedance control problem is studied for both unconstrained and constrained maneuvers. The proposed control strategy is robust with respect to the changes of the environment parameters (such as stiffness and damping coefficient), the unknown Coulomb friction disturbances, payload, and viscous friction variations. The proposed control scheme is also valid for both unconstrained and constrained motions. Our novel approach automatically switches from the free to the constrained motion mode using a simple algorithm of contact detection. In this regard, an impedance control scheme is proposed with the inner loop position control. This means that in the free motion, the applied force to the environment is zero and the reference trajectory for the inner loop position control is the desired trajectory. However, in the constrained motion the reference trajectory for the inner loop is determined by the desired impedance dynamics. Stability of the closed loop control system is proved by Lyapunov theory. Several numerical simulations are carried out to indicate the capability and the effectiveness of the proposed control scheme.

Keywords

Robust impedance controlFractional-order sliding mode controlDisturbance observerSingle-link flexible robotsUnknown environment
Type
Articles
Information
Robotica , Volume 36 , Issue 12 , December 2018 , pp. 1920 - 1942
Copyright
Copyright © Cambridge University Press 2018 

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