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Comparison of null-space and minimal null-space control algorithms

Published online by Cambridge University Press:  01 September 2007

Bojan Nemec ,
Leon Žlajpah  and
Damir Omrčen
Bojan Nemec*
Affiliation:
Robotics Laboratory, Jožef Stefan Institute, Jamova 39, 1001 Ljubljana, Slovenia
Leon Žlajpah
Affiliation:
Robotics Laboratory, Jožef Stefan Institute, Jamova 39, 1001 Ljubljana, Slovenia
Damir Omrčen
Affiliation:
Robotics Laboratory, Jožef Stefan Institute, Jamova 39, 1001 Ljubljana, Slovenia
*
*Corresponding author. E-mail: bojan.nemec@ijs.si
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Summary

This paper deals with the stability of null-space velocity control algorithms in extended operational space for redundant robots. We compare the performance of the control algorithm based on the minimal null-space projection and generalized-inverse-based projection into the Jacobian null-space. We show how the null-space projection affects the performance of the null-space tracking algorithm. The results are verified with the simulation and real implementation on a redundant mobile robot composed of 3 degrees of freedom (DOFs) mobile platform and 7-DOF robot arm.

Keywords

Redundant manipulatorStability of the control algorithmsAutonomous motionObstacle avoidanceMobile manipulator
Type
Article
Information
Robotica , Volume 25 , Issue 5 , September 2007 , pp. 511 - 520
Copyright
Copyright © Cambridge University Press 2007

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