Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)

  • 2008.04a
  • /
  • Pages.609-612
  • /
  • 2008
  • /
  • 1598-2548(pISSN)
The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지

Improvement of Tracking Servo Performance in SIL based Near-field Recording using Disturbance Observer

외란 관측기를 이용한 근접장 기록 시스템의 트랙킹 서보 성능 향상

  • 강민석 (연세대학교 정보저장기기 연구센터) ;
  • 김중곤 (연세대학교 정보저장기기 연구센터) ;
  • 신원호 (연세대학교 정보저장기기 연구센터) ;
  • 정준 (동양공업전문대학교 자동화시스템과) ;
  • 박노철 (정보저장기기 연구센터) ;
  • 양현석 (연세대학교 정보저장기기 연구센터) ;
  • 박영필 (연세대학교 정보저장기기 연구센터)
  • Published : 2008.04.17
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Abstract

The solid immersion lens (SIL) based near-field recording (NFR) system is considered as one of the high density optical data storage system. For the NFR servo system, tracking servo control is a difficult technology to maintain extremely small gap between SIL and media within one twentieth. This is because the track pitch is decreased for increasing the recording density. In this paper, we propose disturbance observer (DOB) and internal model principle (IMP) for disturbance rejection due to eccentricity of disk. The performance of tracking controller using DOB is increased by about 85%, 94%, 97% using Q filters that have bandwidths of 50Hz, 125Hz, 250Hz, respectively. Moreover, IMP based controller is effectively reduced the residual error.

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