Modeling and cancellation of pivot nonlinearity in hard disk drives

This paper considers the issue of modeling the pivot nonlinearity in a typical hard disk drive, taking into account viscous friction, Coulomb friction and hysteresis effects. It presents a nonlinear compensator design, based on a proposed model, to make the compensated system behave like a double integrator regardless of the magnitude of the input current. It describes extensive experiments, carried out in both time domain and frequency domain, to show the effects of pivot nonlinearity and the effectiveness of the compensator.

[1]  Masayoshi Tomizuka,et al.  Rejection of disk drive vibration and shock disturbances with a disturbance observer , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[2]  Guoxiao Guo,et al.  Optimal multirate control design for hard disk drive servo systems , 1998 .

[3]  L. Guo,et al.  Dual-stage actuator servo control for high density disk drives , 1999, 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (Cat. No.99TH8399).

[4]  Daniel Y. Abramovitch,et al.  Disk drive pivot nonlinearity modeling. I. Frequency domain , 1994, Proceedings of 1994 American Control Conference - ACC '94.

[5]  Ben M. Chen,et al.  Discrete-time LQG/LTR dual-stage controller design and implementation for high track density HDDs , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[6]  David P. Magee.  Optimal filtering to improve performance in hard disk drives: simulation results , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[7]  Carlos Canudas de Wit,et al.  A survey of models, analysis tools and compensation methods for the control of machines with friction , 1994, Autom..

[8]  Terril Hurst,et al.  Disk drive pivot nonlinearity modeling. II. Time domain , 1994, Proceedings of 1994 American Control Conference - ACC '94.

[9]  Seungchul Lim.  FINITE ELEMENT ANALYSIS OF FLEXURAL VIBRATIONS IN HARD DISK DRIVE SPINDLE SYSTEMS , 2000 .

[10]  Ho Seong Lee,et al.  Open-Loop Compensation of Repeatable Runouts in Discrete-Track Magnetic Disks , 1996 .

[11]  P. Dahl.  Solid Friction Damping of Mechanical Vibrations , 1976 .

[12]  Y. Yamaguchi,et al.  Air flow around magnetic-head-slider suspension and its effect on slider flying-height fluctuation , 1990, International Conference on Magnetics.

[13]  A. A. Renshaw,et al.  Aerodynamically Excited Vibration Of A Rotating Disk , 1994 .

[14]  Sang-Eun Baek,et al.  Modeling of pivot friction using relay function and estimation of its frictional parameters , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[15]  C. D. Mote,et al.  Aerodynamically Excited Vibration And Flutter Of A Thin Disk Rotating At Supercritical Speed , 1993 .

[16]  Tong Heng Lee,et al.  Design and implementation of a hard disk drive servo system using robust and perfect tracking approach , 1999, Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304).

[17]  Terril Hurst,et al.  The PES Pareto method: uncovering the strata of position error signals in disk drives , 1997, Proceedings of the 1997 American Control Conference (Cat. No.97CH36041).

[18]  Terril Hurst,et al.  Measurements for the PES Pareto method of identifying contributors to disk drive servo system errors , 1997, Proceedings of the 1997 American Control Conference (Cat. No.97CH36041).

[19]  Terril Hurst,et al.  of the PES Pareto Method for Decomposing Baseline Noise Sources in Hard Disk Position Error Signals , 1998 .

[20]  S. Weerasooriya,et al.  Disk drive pivot nonlinearity modeling and compensation through fuzzy logic , 1998 .

[21]  K. Chew.  Control system challenges to high track density magnetic disk storage , 1996 .

[22]  Xiong Liu,et al.  Analysis and measurement of torque hysteresis of pivot bearing in hard disk drive applications , 1999 .

[23]  Terril Hurst,et al.  Decomposition of baseline noise sources in hard disk position error signals using the PES Pareto method , 1997, Proceedings of the 1997 American Control Conference (Cat. No.97CH36041).