Brief paper: Suppressing intersample behavior in iterative learning control

  • Authors:
  • Tom Oomen;Jeroen van de Wijdeven;Okko Bosgra

  • Affiliations:
  • Eindhoven University of Technology, Faculty of Mechanical Engineering, Control Systems Technology Group, PO Box 513, 5600 MB Eindhoven, The Netherlands;Eindhoven University of Technology, Faculty of Mechanical Engineering, Control Systems Technology Group, PO Box 513, 5600 MB Eindhoven, The Netherlands;Eindhoven University of Technology, Faculty of Mechanical Engineering, Control Systems Technology Group, PO Box 513, 5600 MB Eindhoven, The Netherlands

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2009

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Abstract

Iterative Learning Control (ILC) is a control strategy to improve the performance of digital batch repetitive processes. Due to its digital implementation, discrete time ILC approaches do not guarantee good intersample behavior. In fact, common discrete time ILC approaches may deteriorate the intersample behavior, thereby reducing the performance of the sampled-data system. In this paper, a generally applicable multirate ILC approach is presented that enables to balance the at-sample performance and the intersample behavior. Furthermore, key theoretical issues regarding multirate systems are addressed, including the time-varying nature of the multirate ILC setup. The proposed multirate ILC approach is shown to outperform discrete time ILC in realistic simulation examples.