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State observer-based robust control scheme for electrically driven robot manipulators

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3 Author(s)
Oya, M. ; Dept. of Control Eng., Kyushu Inst. of Technol., Kitakyushu, Japan ; Chun-Yi Su ; Kobayashi, T.

By using a state observer, a new robust trajectory tracking control scheme is developed in this paper for electrically driven robot manipulators. The role of the observer is to estimate joint angular velocities. The proposed controller does not employ adaptation, but assures robust stability of tracking error between joint angles and desired trajectories. At sacrificing asymptotical stability of the tracking errors, the configuration of the proposed controller becomes very simple, compared with regressor-based adaptive controllers. It is shown in the closed-loop system using the proposed controller that the Euclidian norm of tracking errors arrives at any small closed region with any convergent rate by setting only one design parameter. Especially for the desired trajectories converging to constant ultimate values, it is assured that tracking errors converge to zero.

Published in:

Robotics, IEEE Transactions on  (Volume:20 ,  Issue: 4 )

Date of Publication:

Aug. 2004

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