Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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An Optical Disk Drive Servo System Using a Modified Disturbance Observer

수정된 외란관측기를 이용한 광 디스크 드라이브 서보 시스템

  • 정종일 (한양대학교 전자통신전파공학부) ;
  • 김무섭 (한양대학교 전자통신전파공학부) ;
  • 오경환 (삼성전자 스토리지 사업부) ;
  • 정정주 (한양대학교 전자통신전파공학부)
  • Published : 2005.06.01
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Abstract

Using a disturbance observer is effective in enhancing the performance of dynamic system in presence of disturbances. Although various types of disturbance observers have been proposed to improve sensitivity of systems, there exist poor transient responses due to cross-couplings among disturbance observer loops. In this paper, dual disturbance observer (DOB) is proposed to reduce the effects of the cross-couplings. A different type of loop transfer function is proposed for external disturbance observer. While improving the sensitivity function by adding external DOB, it also provides improved complementary sensitivity function. The proposed dual DOB is applied to a commercial optical disk drive tracking system. It is shown that the dual DOB is an effective method in rejecting the effect of disturbance as well as improving the tracking performance.

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References

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