Loop shaping issues in Hard Disk Drive servo system design

A. Beghi, R. Oboe, P. Capretta, F. C. Soldavini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, the design of Hard Disk Drive (HDD) servo systems based on state-space techniques is considered. In particular, we analyze the performances of discrete-time controllers obtained by means of LQG optimal control theory. The key control design issue we address is related to the need of achieving sufficiently high close-loop bandwidth while granting adequate disturbance rejection in the loop gain crossover frequency region. It turns out that the shaping of the sensitivity function is a critical issue, in particular when Run Outs compensation schemes are introduced (e.g., repetitive control schemes). The effectiveness of discrete-time loop transfer recovery techuiques (LTR) in achieving a satisfactory loop shaping design starting from an LQG regulator is discussed. The proposed control algorithms are then evaluated on a test platform based on a commercial HDD. The experimental results thus obtained are reported and discussed.

Original languageEnglish
Title of host publicationIEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM
Pages828-832
Number of pages5
Volume2
Publication statusPublished - 2001
Event2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics Proceedings - Como, Italy
Duration: Jul 8 2001Jul 12 2001

Other

Other2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics Proceedings
CountryItaly
CityComo
Period7/8/017/12/01

Keywords

  • Hard disk drives
  • Loop transfer recovery
  • LQG controller design
  • Single stage actuators

ASJC Scopus subject areas

  • Engineering(all)

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    Beghi, A., Oboe, R., Capretta, P., & Soldavini, F. C. (2001). Loop shaping issues in Hard Disk Drive servo system design. In IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (Vol. 2, pp. 828-832)