Time optimal seek control for a coupled dual stage disk drive actuator

1997 ◽  
Vol 33 (5) ◽  
pp. 2629-2631 ◽  
Author(s):  
Jian-Dong Yang ◽  
Long-Fa Pan ◽  
Xian-Deng Pei ◽  
Chang-Sheng Xie ◽  
Xiang-Ying Cao ◽  
...  
Keyword(s):  
Disk Drive ◽  
Time Optimal ◽  
Dual Stage

Time Optimal Seek Control For A Coupled Dual Stage Disk Drive Actuator

2005 ◽  
Author(s):  
Jian-Dong Yang ◽  
Long-Fa Pan ◽  
Xian-Deng Pei ◽  
Chang-Sheng Xie ◽  
Xiang-Ying Cao ◽  
...  
Keyword(s):  
Disk Drive ◽  
Time Optimal ◽  
Dual Stage

Time Optimal Seek Trajectories for a Dual Stage Optical Disk Drive Actuator

1991 ◽  
Vol 113 (3) ◽  
pp. 534-536 ◽  
Author(s):  
J. McCormick ◽  
R. Horowitz
Keyword(s):  
High Performance ◽  
Necessary Conditions ◽  
Closed Form Solution ◽  
Disk Drive ◽  
Form Solution ◽  
Actuator Disk ◽  
Optical Disk Drive ◽  
Time Optimal ◽  
Dual Stage ◽  
Optical Disks

A closed-form solution for the time optimal control of a dual actuator disk drive system that takes into account the physical constraint limiting the relative motion of the fine and coarse actuator has been derived. The result is useful for determining track seeking strategies for high performance optical disks. The application of the necessary conditions to a simplified model of the compound actuator is presented and a solution derived.

scholarly journals Design and Implementation of Dual-Stage Track-Following Control for Hard Disk Drives

2009 ◽  
Author(s):  
Jianbin Nie ◽  
Roberto Horowitz
Keyword(s):  
Hard Disk Drives ◽  
Servo System ◽  
Hard Disk ◽  
Disk Drive ◽  
Disk Drives ◽  
Outer Loop ◽  
Servo Systems ◽  
Design And Implementation ◽  
Integral Action ◽  
Dual Stage

This paper discusses the design and implementation of two track-following controllers for dual-stage hard disk drive servo systems. The first controller is designed by combining an outer loop sensitivity-decoupling (SD) controller with an inner loop disturbance observer (DOB). The second is designed by combining mixed H2/H∞ synthesis techniques with an add-on integral action. The designed controllers were implemented and evaluated on a disk drive with a PZT-actuated suspension-based dual-stage servo system. Position error signal (PES) for the servo system was obtained by measuring the slider displacement with an LDV and injecting a simulated track runout.

Comparison of Robust Track-Following Control Systems for a Dual Stage Hard Disk Drive

1999 ◽  
pp. 101-118 ◽  
Author(s):  
Toshiya Suzuki ◽  
Takamasa Usui ◽  
Minoru Sasaki ◽  
Fumio Fujisawa ◽  
Takashi Yoshida ◽  
...  
Keyword(s):  
Control Systems ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Dual Stage

Application of Piezoelectric Materials for Use as Actuators and Sensors in Hard Disk Drive Suspension Assemblies

1999 ◽  
Vol 604 ◽  
Author(s):  
J. R. Heffelfinger ◽  
D. A. Boismier
Keyword(s):  
Hard Disk Drive ◽  
Piezoelectric Materials ◽  
Hard Disk ◽  
Disk Drive ◽  
Critical Material ◽  
Piezoelectric Motors ◽  
Dual Stage ◽  
Voltage Generation ◽  
Aging Rates ◽  
Fft Analysis

AbstractSuspension assemblies, the mechanical arm that supports the read/write head in a Hard Disk Drive (HDD), are incorporating piezoelectric motors for dual-stage actuation. With high displacements and high Curie Temperatures, lead zirconium titanate (PZT) is the preferred piezoelectric material for this application. In this study, commercially available PZT is studied for critical material properties that include strength, aging and particulate generation. An average PZT strength of 111.7 MPa and a Weibull parameter (m) of 12.18 was measured for the material. Aging rates of the dielectric constant vary between 1.9 to 3.2 % per time decade depending on the test condition. The attachment of PZT motors to the suspension assembly provides a method of sensing suspension resonance, shock and temperature fluctuations. Fast Fourier Transform (FFT) analysis of voltage generation of the PZT during drive operation identified a frequency of 6509 Hz that is within 0.2% of the measured resonance frequency of the suspension. The PZT generated several volts for shock events between 500 to 2000 G's of the suspension. Implications of the material parameters and potential sensing capabilities of the PZT are discussed.

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