Performance of convergence-based variable-gain control of optical storage drives

  • Authors:

  • N. van de Wouw;H. A. Pastink;M. F. Heertjes;A. V. Pavlov;H. Nijmeijer

  • Affiliations:

  • Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;Océ Technologies, P.O. Box 101, 5900 MA, Venlo, The Netherlands;Philips Applied Technologies, Department Mechatronics Technologies, 5600 MD Eindhoven, The Netherlands;NTNU, Department of Engineering Cybernetics, N7491 Trondheim, Norway;Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2008

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Abstract

In this paper, a method for the performance assessment of a variable-gain control design for optical storage drives is proposed. The variable-gain strategy is used to overcome well-known linear control design trade-offs between low-frequency tracking properties and high-frequency noise sensitivity. A convergence-based control design is proposed that guarantees stability of the closed-loop system and a unique bounded steady-state response for any bounded disturbance. These favourable properties, guaranteed by virtue of convergence, allow for a unique performance evaluation of the control system. Moreover, technical conditions for convergence are derived for the variable-gain controlled system and a quantitative performance measure, taking into account both low-frequency tracking properties and high-frequency measurement noise sensitivity, is proposed. The convergence conditions together with the performance measure jointly constitute a design tool for tuning the parameters of the variable-gain controller. The resulting design is shown to outperform linear control designs.