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Control of flexible arms with friction in the joints

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3 Author(s)
Feliu, V. ; Dept. Ingenieria Electr., Electron. y de Control, Univ. Nacional de Educacion, Madrid, Spain ; Rattan, K.S. ; Brown, H.B., Jr.

The control of flexible arms with friction in the joints is studied. A method to identify the dynamics of a flexible arm from its frequency response (which is strongly distorted by Coulomb's friction) is proposed. A robust control scheme that minimizes the effects of this friction is presented. The scheme consists of two nested feedback loops: an inner loop to control the motor position and an outer loop to control the tip position. It is shown that a proper design of the inner loop eliminates the effects of friction while controlling the tip position and significantly simplifies the design of the outer loop. The proposed scheme is applied to a class of lightweight flexible arms, and the experiments show that the control scheme results in a simple controller. As a result, the computations are minimized and, thus, high sampling rates may be used

Published in:

Robotics and Automation, IEEE Transactions on  (Volume:9 ,  Issue: 4 )

Date of Publication:

Aug 1993

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