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research article

Model-Free Precompensator Tuning Based on the Correlation Approach

Karimi, Alireza  
•
Butcher, Mark
•
Longchamp, Roland  
2008
IEEE Transactions on Control Systems Technology

High performance output tracking can be achieved by precompensator or feedforward controllers based on the inverse of either the closed-loop system or the plant model, respectively. However, it has been shown that these inverse controllers can adversely affect the tracking performance in the presence of model uncertainty. In this paper, a model-free approach based on only one set of acquired data from a simple closed-loop experiment is used to tune the controller parameters. The approach is based on the decorrelation of the tracking error and the desired output and is asymptotically not sensitive to noise and disturbances. From a system identification point of view the stable inverse of the closed-loop system is identified by an extended instrumental variable algorithm in the framework of errors-in-variables identification methods. By a frequency-domain analysis of the criterion, it is shown that the weighted two-norm of the difference between the controller and the inverse of the closed-loop transfer function can be minimized. The method is successfully applied to a high precision position control system.

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Type
research article
DOI
10.1109/TCST.2007.916315
Web of Science ID

WOS:000258822100015

Author(s)
Karimi, Alireza  
Butcher, Mark
Longchamp, Roland  
Date Issued

2008

Published in
IEEE Transactions on Control Systems Technology
Volume

16

Issue

5

Start page

1013

End page

1020

Subjects

Feedforward control

•

correlation

•

linear motor

•

data-driven approach

Note

Prj_RobustRST_PosSyst Prj_DDMethodTracking

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LA  
Available on Infoscience
September 19, 2007
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/12234
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