Robustness enhanced adaptive control and optical head focusing experiment

Tsu Chin Tsao*, Steve Gibson, K. C. Chiu, Shean-Jen Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


This paper presents a robustness-enhanced adaptive control scheme and application to an experiment for the focusing of an optical read-write head for optical data storage drives. Minimum-variance adaptive controllers have applied recursive least-squares algorithms to predict output disturbance and dynamically compute control commands to minimize the output error. This existing adaptive control could become unstable when significant modeling errors and uncertainties exist. An extension is made to the existent adaptive control scheme to achieve robust stability while minimally sacrificing the control performance. Simulation and experiment conducted on the optical focusing of a digital video recording drive's read-write head demonstrate that the proposed robustness enhancement adaptive control scheme is effective in achieving stability and performance while the existing adaptive control fails.

Original languageEnglish
Title of host publicationProceedings of the 18th IFAC World Congress
PublisherIFAC Secretariat
Number of pages6
Edition1 PART 1
ISBN (Print)9783902661937
StatePublished - 1 Jan 2011

Publication series

NameIFAC Proceedings Volumes (IFAC-PapersOnline)
Number1 PART 1
ISSN (Print)1474-6670


  • Adaptive control
  • Digital control
  • Disturbance rejection
  • Minimum variance control
  • Optical disk

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