Identification of the secondary actuator dynamics at frequencies beyond the Nyquist Rate in Dual-Stage Actuator Hard Disk Drive systems

In Hard Disk Drive (HDD) head positioning control systems, the system output can be observed only at fixed finite time intervals. Identification of the plant dynamics embedded in such an inherently sampled-data system requires special considerations to avoid the aliasing effect caused by the sampling operation. In this paper, non-parametric algorithms to identify the secondary actuator dynamics in a Dual-Stage Actuator HDD system are investigated. Identification methods with continuous-time and discrete-time excitation input are proposed. In the discrete-time method, a multirate digital—analogue converter and multirate filters are employed to reduce the aliasing effect. Numerical simulation and experimental results are presented to show the effectiveness of the proposed methods.

[1]  Frank L. Lewis,et al.  Singular Perturbation Control for Vibration Rejection in HDDs Using the PZT Active Suspension as Fast Subsystem Observer , 2007, IEEE Transactions on Industrial Electronics.

[2]  R. Horowitz,et al.  Vibration control of a PZT actuated suspension dual-stage servo system using a PZT sensor , 2002, Digest of the Asia-Pacific Magnetic Recording Conference.

[3]  M. Kawafuku,et al.  Identification Method for Plant Dynamics Over Nyquist Frequency , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[4]  Roberto Horowitz,et al.  Dual-stage track-following servo design for hard disk drives , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[5]  Takenori Atsumi,et al.  High-bandwidth servo control designs for magnetic disk drives , 2001, 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (Cat. No.01TH8556).

[6]  Roberto Horowitz,et al.  Track-following controller design of MEMS based dual-stage servos in magnetic hard disk drives , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[7]  Guoxiao Guo,et al.  Comparative analysis on resonance compensation in HDD dual-stage actuation systems , 2003, IEEE Trans. Ind. Electron..

[8]  T. Yamaguchi.  HDD servo control development - Present and future , 2006, 2006 SICE-ICASE International Joint Conference.

[9]  H. Numasato,et al.  Adaptive control of dual-stage actuator for hard disk drives , 2004, Proceedings of the 2004 American Control Conference.

[10]  S. Nakagawa,et al.  A phase-stabilized servo controller for dual-stage actuators in hard disk drives , 2002, Digest of the Asia-Pacific Magnetic Recording Conference.

[11]  H. Numasato,et al.  Settling control and performance of dual-actuator system for hard disk drives , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).

[12]  William C. Messner,et al.  On Compensator Design for Linear Time-Invariant , 2001 .

[13]  S. Koganezawa,et al.  Dual-stage actuator system for magnetic disk drives using a shear mode piezoelectric microactuator , 1999 .

[14]  Roberto Horowitz,et al.  High-bandwidth high-accuracy rotary microactuators for magnetic hard disk drive tracking servos , 1998 .

[15]  Toshiki Hirano,et al.  Dual-stage servo controller for HDD using MEMS microactuator , 1999 .

[16]  R.A. de Callafon,et al.  Comparison and design of servo controllers for dual-stage actuators in hard disk drives , 2003, Digest of INTERMAG 2003. International Magnetics Conference (Cat. No.03CH37401).

[17]  R. Ehrlich,et al.  Identification of sampled data systems at frequencies beyond the Nyquist rate , 1989, Proceedings of the 28th IEEE Conference on Decision and Control,.

[18]  Tong Heng Lee,et al.  Singular Perturbation Control for Vibration Rejection in HDDs with a PZT Active Suspension , 2006, Proceedings of the 45th IEEE Conference on Decision and Control.

[19]  Jinchuan Zheng,et al.  Feedforward decoupling control design for dual-actuator system in hard disk drives , 2004 .

[20]  R. Horowitz.  Track seek control for hard disk dual-stage servo systems , 2000, 2000 Asia-Pacific Magnetic Recording Conference. Digests of APMRC2000 on Mechanical and Manufacturing Aspects of HDD (Cat. No.00EX395).

[21]  Y. Yamaguchi,et al.  A dual-stage magnetic disk drive actuator using a piezoelectric device for a high track density , 1991 .