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

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Asymptotic Disturbance Rejection using a Disturbance Observer in the Track-Following Control System of a High-Speed Optical Disk Drive

고배속 광디스크 드라이브 트랙 추종 제어 시스템에서의 외란 관측기를 이용한 점근적 외란 제거

  • 유정래 (한국과학기술원 전자전산학과) ;
  • 문정호 (강릉대학교 정보전자공학) ;
  • 진경복 (한국기술교육대학교 제어시스템공학) ;
  • 정명진 (한국과학기술원 전자전산학과)
  • Published : 2004.05.01
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Abstract

To obtain a good tracking performance in an optical disk drive servo system, it is essential to attenuate periodic disturbances caused by eccentric rotation of the disk. As an effective control scheme for enhancing disturbance attenuation performance, disturbance observers (DOBs) have been successfully applied to the track-following servo system of optical disk drives. In disk drive systems, the improvement of data transfer rate has been achieved mainly by the increase of disk rotational speed, which leads to the increase of the disturbance frequency. Conventional DOBs are no longer effective in disk drive systems with a high-speed rotation mechanism because the performance of conventional DOBs is severely degraded as the disk rotational frequency increases. This paper proposes a new DOB structure for effective rejection of the disturbance in optical disk drives with a very high rotation speed. Asymptotic disturbance rejection is achieved by adopting a band-pass filter in the DOB structure, which is tuned based on the information on the disturbance frequency. In addition, performance sensitivity of the proposed DOB to changes in disk rotational frequency is analyzed. The effectiveness of the proposed DOB is verified through simulations and experiments using a DVD-ROM drive.

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References

  1. T. H. Akkermans and S. G. Stan, 'Digital serveo IC for optical disc drives,' Contr. Eng. Pract., vol. 9, no. 11, pp. 1245-1253 https://doi.org/10.1016/S0967-0661(01)00070-3
  2. S. Bittanti, F. Dell'Orto, A. D. Carlo, S. M. Savares, 'Notch filtering and multirate control for radial tracking in high-speed DVD-players,' IEEE Tran. Consumer. Electron., vol. 48, no. 1, pp. 56-62, Feb., 2002 https://doi.org/10.1109/TCE.2002.1010092
  3. K. Fujiyama, R. Katayama, T. Hamaguchi, and K. Kawakami, 'Digital controller design for recordable optical disk player using disturbance observer,' in Proc. Adv. Mot. Contr.., pp. 141-146, 2000 https://doi.org/10.1109/AMC.2000.862845
  4. M. T. White, M. Tomizuka, and C. Smith, 'Improved track following in magnetic disk drives using a disturbance observer,' IEEE/ASME Trans. Mechatron., vol. 5, no. 1, pp. 3-11, March, 2000 https://doi.org/10.1109/3516.828584
  5. J. R. Ryoo, T. Y. Doh, and M. J. Chung, 'Disturbance observer design for track-following control in optical disk drive using structured singular value,' in Disturbance observer design for track-following control in optical disk drive using structured singular value,' Proc. Int. Conf. Contr. Automat. Syst., 2002
  6. K.-S. Kim, S.-P. Hong, 'Enhancing the tracking performance in optical storage systems using a disturbance compensator', in Proc. Amer. Contr. Conf., pp. 1384-1388, 2002 https://doi.org/10.1109/ACC.2002.1023214
  7. Y. Choi, K. Yang, W. K. Chung, H. R. Kim, and I. H. Suh, 'On the robustness and performance of disturbance observers for second-order systems,' IEEE Tran. Automat. Contr., vo. 48, no. 2, pp. 315-320, Feb., 2003 https://doi.org/10.1109/TAC.2002.808491
  8. J. W. Howze, and S. P. Bhattacharyya, 'Robust tracking, error feedback, and two-degree-of-freedom controllers,' IEEE Trans. Automat. Contr., vol. 42, no. 7, pp. 980-983, July, 1997 https://doi.org/10.1109/9.599977
  9. L. H. Keel, S. P. Bhattacharyya, and J. W. Howze, 'Robust tracking and disturbance rejection with two DOF controllers and distributed internal models,' in Proc. Amer. Contr. Conf., pp. 3892-3896, 1997 https://doi.org/10.1109/ACC.1997.609615
  10. DVD Forum, 'DVD specifications for read-only disc-part 1. physicl specificationsversion 1.01,' 1997
  11. K. Ogata, Discrete-Time Control Systems, Englewood Cliffs, NJ:Prentice-Hall, 1995
  12. J. H. Moon, M. N. Lee, M. J. Chung, S. Y. Jung, and D. H. Shin, 'Track-following control for optical disk drives using an iterative learning scheme,' IEEE Tran. Consumer Electron., vol. 42, no. 2, pp. 192-198, May, 1996 https://doi.org/10.1109/30.494420