[article] 
inTransactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 N°5 (Septembre 2008) . - 8 p.

Titre :	Optimizing learning convergence speed and converged error for precision motion control
Type de document :	texte imprimé
Auteurs :	Douglas A. Bristow, Auteur ; Alleyne, Andrew G., Auteur ; Marina Tharayil, Auteur
Année de publication :	2008
Article en page(s) :	8 p.
Note générale :	dynamic systems
Langues :	Anglais (eng)
Mots-clés :	design  errors  filters  iterative learning control  accuracy  motion control
Résumé :	This brief paper considers iterative learning control (ILC) for precision motion control (PMC) applications. This work develops a methodology to design a low pass filter, called the Q-filter, that is used to limit the bandwidth of the ILC to prevent the propagation of high frequencies in the learning. A time-varying bandwidth Q-filter is considered because PMC reference trajectories can exhibit rapid changes in acceleration that may require high bandwidth for short periods of time. Time-frequency analysis of the initial error signal is used to generate a shape function for the bandwidth profile. Key parameters of the bandwidth profile are numerically optimized to obtain the best tradeoff in converged error and convergence speed. Simulation and experimental results for a permanent-magnet linear motor are included. Results show that the optimal time-varying Q-filter bandwidth provides faster convergence to lower error than the optimal time-invariant bandwidth.
En ligne :	http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]

[article] Optimizing learning convergence speed and converged error for precision motion control [texte imprimé] / Douglas A. Bristow, Auteur ; Alleyne, Andrew G., Auteur ; Marina Tharayil, Auteur . - 2008 . - 8 p.
dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 130 N°5 (Septembre 2008) . - 8 p.

Mots-clés :	design  errors  filters  iterative learning control  accuracy  motion control
Résumé :	This brief paper considers iterative learning control (ILC) for precision motion control (PMC) applications. This work develops a methodology to design a low pass filter, called the Q-filter, that is used to limit the bandwidth of the ILC to prevent the propagation of high frequencies in the learning. A time-varying bandwidth Q-filter is considered because PMC reference trajectories can exhibit rapid changes in acceleration that may require high bandwidth for short periods of time. Time-frequency analysis of the initial error signal is used to generate a shape function for the bandwidth profile. Key parameters of the bandwidth profile are numerically optimized to obtain the best tradeoff in converged error and convergence speed. Simulation and experimental results for a permanent-magnet linear motor are included. Results show that the optimal time-varying Q-filter bandwidth provides faster convergence to lower error than the optimal time-invariant bandwidth.
En ligne :	http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&is [...]