Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-03-29
1999-11-09
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4435, 369 54, G11B 7085
Patent
active
059827211
ABSTRACT:
An optical disc storage system comprises a sliding mode controller for actuating an optical read head assembly over an optical disc during focus capture, focus tracking, track seeking and centerline tracking. The sliding mode controller is a non-linear control system which operates by switching between positive and negative feedback in order to force certain phase states (such as the read head's position error and velocity) to follow a predetermined phase state trajectory. Sliding mode control provides improved compensation to parametric variations, external load disturbances and other transients such as, for example, the focus capture transient. Furthermore, the sliding mode positive and negative feedback gains need only be within a predetermined range, thereby allowing gain values of 2.sup.n which significantly reduces the complexity and cost of the gain multipliers.
REFERENCES:
patent: 4713596 (1987-12-01), Bose
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5132948 (1992-07-01), Ishibashi
patent: 5233585 (1993-08-01), Dente et al.
patent: 5341078 (1994-08-01), Torii et al.
patent: 5345348 (1994-09-01), Suzuki
patent: 5351224 (1994-09-01), Nagata et al.
patent: 5363357 (1994-11-01), Niwayama
patent: 5367513 (1994-11-01), Bates et al.
patent: 5384762 (1995-01-01), Kagami et al.
patent: 5399849 (1995-03-01), Jung
patent: 5404346 (1995-04-01), Koyama et al.
patent: 5406535 (1995-04-01), Seo et al.
patent: 5412636 (1995-05-01), Hasimoto et al.
patent: 5416756 (1995-05-01), Takeshita et al.
patent: 5416759 (1995-05-01), Chun
patent: 5432763 (1995-07-01), Campbell et al.
patent: 5436877 (1995-07-01), Ohshima
patent: 5438557 (1995-08-01), Ito et al.
patent: 5442270 (1995-08-01), Tetsauki
patent: 5446711 (1995-08-01), Yamamiya
patent: 5459624 (1995-10-01), Erickson et al.
M. Ogawa and T. Furukawa, "Robust Servo System of Optical Disk Drive, " Japanese Journal of Applied Physics, vol. 31, No. 2B, Feb. 1, 1992, pp. 643-647.
Chandrasekhar Namuduri and Paresh C. Sen, "A Servo-Control System Using a Self-Controlled Synchronous Motor (SCSM) With Sliding Mode Controller", IEEE Trans. on Industry Applications, vol IA-23, No. 2, Mar./Apr. 1987.
John Y, Hung, Weibing Gao, and James C, Hung, "Variable Structure Control: A Survey", IEEE Trans. on Industrial Electronics, vol. 40, No. 1, Feb. 1993.
Katsuhisa Furuta, "Sliding Mode Control of a Discrete System", Systems & Control Letters, vol. 14, No. 2, Feb. 1990.
J.C. Hung, "Chattering Handling for Variable Structure Control Systems", Proceedings of the IECON '93, vol. 3, 1993.
Raymond A. DeCarlo, Stanislaw H. Zak, and Gregory Mathews, "Variable Structure Control Of Non-linear Multivariable Systems: A Tutorial", Proceedings of the IEEE, vol. 76, No. 3, Mar. 1988.
V.I. Utkin, "Discontinuous Control System: State of Art In Theory and Applications", Automatic Control World congress 1987, vol. 1.
G.C. Verghese, B. Fernandez R., and J.K. Hedrick, "Stable, Robust Tracking by Sliding Mode control", Systems & Control Letters, vol. 10, 1988.
Kar-Keung D. Young and Harry G. Kwatny, "Variable Structure Servomechanism Design and Applications to Overspeed Protection Control", 1982 International Federation of Automatic Control.
Weibing Gao and James C. Hung, "Variable Structure Control of Nonlinear Systems: A New Approach", IEEE Trans. on Industrial Electronics, vol. 40, No. 1, Feb. 1993.
M.A. El-Sharkawi, "Development and Implementation of High Performance Variable Structure Tracking Control For Brushless Motors", IEEE/PES 1990 Summer Meeting, Mineapolis, minnesota, Jul. 15-19, 1990.
Weibing Gao, Yufu Wang, and Abdollah Himaifa, "Discrete-Time Variable Structure Control Systems", IEEE Trans. on Industrial Electronics, vol. 42, No. 2, Apr. 1995.
Reiff Francis H.
Romano Paul M.
Supino Louis
Cirrus Logic Inc.
Sheerin Howard
Shifrin Dan A.
Young W. R.
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