Butterworth Pattern-based Simultaneous Damping and Tracking Controller Designs for Nanopositioning Systems

Douglas Russell, Andres San-Millan, Vicente Feliu, Sumeet Sunil Aphale

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Abstract

The Butterworth filter is known to have maximally flat response. Incidentally, the same response is desired in precise positioning systems. This paper presents a method for obtaining a closed-loop Butterworth filter pattern using common control schemes for positioning applications, i.e., Integral Resonant Control (IRC), Integral Force Feedback (IFF), Positive Position Feedback (PPF), and Positive Velocity and Position Feedback (PVPF). Simulations show a significant increase in bandwidth over traditional design methods and verify the desired pole placement is achieved. The simulations also show a significant limitation of the achievable bandwidth in the case of IRC, IFF, and PPF. For this reason, only PVPF is considered in experimental analysis. Experiments are performed using a two-axis serial kinematic nanopositioning stage. The results show a significant improvement in bandwidth, from 123 to 370 Hz, and increased positioning accuracy, specifically at the turn-around point, in comparison to the sequentially designed control scheme.
Original languageEnglish
Article number2
JournalFrontiers in Mechanical Engineering
Volume2
Early online date12 Feb 2016
DOIs
Publication statusPublished - 1 Mar 2016

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Keywords

  • nanopositioning
  • damping control
  • tracking control
  • integral resonance control
  • positive position feedback
  • positive velocity and position feedback

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