Two-time scale control and observer design for trajectory tracking of two cooperating robot manipulators moving a flexible beam

Authors:
Ali Tavasoli;Mohammad Eghtesad;Hamed Jafarian
Affiliations:
Department of Mech. Eng., Shiraz University, Mollasadra Ave., Shiraz, Fars, Zip Code: 71348-51154, Iran;Department of Mech. Eng., Shiraz University, Mollasadra Ave., Shiraz, Fars, Zip Code: 71348-51154, Iran;Department of Mech. Eng., Shiraz University, Mollasadra Ave., Shiraz, Fars, Zip Code: 71348-51154, Iran
Venue:
Robotics and Autonomous Systems
Year:
2009

Citing 3
Cited 3

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Adaptive neural controller for cooperative multiple robot manipulator system manipulating a single rigid object

Applied Soft Computing
Trajectory tracking and vibration control of two planar rigid manipulators moving a flexible object

ICIRA'11 Proceedings of the 4th international conference on Intelligent Robotics and Applications - Volume Part I

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Abstract

In this paper, we present two-time scale control design for trajectory tracking of two cooperating planar rigid robots moving a flexible beam, which does not require vibration measurement for the beam. First, the kinematics and dynamics of the robots and the object are derived. Then, using the relations between different forces acting on the object by the manipulators' end-effectors, dynamics equations of the robots and the object are combined. The resulting equations show that the coupled dynamics including beam vibration and the rigid motion take place in two different time domains. By applying two-time scale control theory on the combined dynamics, a composite control scheme is elaborated which makes the beam orientation and its center of mass position track a desired trajectory while suppressing the beam vibration. For the controller algorithm, first a slow controller is utilized for the slow (rigid) subsystem and then a fast stabilizing controller is considered for the fast (flexible) subsystem. To avoid requiring measurement of beam vibration for the fast control law, a linear observer is also designed. The simulation results show the efficiency of the proposed control scheme.