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

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

Research output: Contribution to journalArticleAcademicpeer-review

34 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)15-27
JournalAutomatica
Volume44
Issue number1
DOIs
Publication statusPublished - 2008

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