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An approach to autonomous robot assembly

Published online by Cambridge University Press:  09 March 2009

Daniel E. Koditschek
Daniel E. Koditschek
Affiliation:
Artificial Intelligence Laboratory, EELS Department, College of Engineering, University of Michigan, Ann Arbor, Michigan 48109(USA)
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Summary

Assembly problems require that a robot with fewer actuated degrees of freedom manipulate an environment containing a greater number of unactuated degrees of freedom. From the perspective of control theory, these problems hold considerable interest because they are characterized by the presence of non-holonomic constraints that preclude the possibility of feedback stabilization. In this sense they necessitate the introduction of a hierarchical controller. This paper explores these issues in the simple instance when all of the pieces to be assembled are constrained to lie on a line. A hierarchical controller is devised for this problem and is shown to be correct: the closed loop system achieves any desired final assembly from all initial configurations that lie in its connected component in configuration space; the generated sequence of motions never causes collisions between two pieces. Further examination of this approach interprets the controller's mediation of conflicting subgoals as promoting an M-player game amongst the pieces to be assembled.

Keywords

Autonomous assemblyRobotsHierarchical controllerClosed loop system
Type
Article
Information
Robotica , Volume 12 , Issue 2 , March 1994 , pp. 137 - 155
Copyright
Copyright © Cambridge University Press 1994

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