Head positioning control of a hard disk drive using H/sup infinity / theory

2005 ◽  
Author(s):  
M. Hirata ◽  
K.Z. Liu ◽  
T. Mita ◽  
T. Yamaguchi
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Positioning Control ◽  
Head Positioning

scholarly journals Head Positioning Control of a Hard Disk Drive Using H^|^infin; Control Theory

1993 ◽  
Vol 29 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Mitsuo HIRATA ◽  
Kang-Zhi LIU ◽  
Tsutomu MITA ◽  
Takashi YAMAGUCHI
Keyword(s):  
Control Theory ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Positioning Control ◽  
Head Positioning

Head-Positioning Control of Hard Disk Drives Through the Integrated Design of Mechanical and Control Systems

2009 ◽  
Vol 3 (3) ◽  
pp. 277-285 ◽  
Author(s):  
Takenori Atsumi ◽  
Keyword(s):  
Control Systems ◽  
Hard Disk Drives ◽  
Integrated Design ◽  
Hard Disk ◽  
Disk Drive ◽  
Nanometer Scale ◽  
Disk Drives ◽  
Positioning Control ◽  
Head Positioning ◽  
And Control

A Hard Disk Drive (HDD) is an inexpensive mass-production product, but the head-positioning control systems of HDDs require nanometer-scale positioning performance. Therefore, we have studied head-positioning control systems of HDD using designs which integrate mechanical and control systems to improve their control performance while curbing cost increases. In this paper, we introduce “disturbance suppression in high-frequency ranges through phase stable design for high-order mechanical resonances” and “high servo-bandwidth design through mode shape design of mechanical resonance” as examples of techniques that have been developed and are easily applied to products.

Tuning of a Hard Disk Drive Servo Controller Using Fixed-Structure H∞ Controller Optimization

2000 ◽  
Vol 123 (3) ◽  
pp. 544-549 ◽  
Author(s):  
Soichi Ibaraki ◽  
Masayoshi Tomizuka
Keyword(s):  
Hard Disk Drives ◽  
Output Feedback Control ◽  
Hard Disk ◽  
Disk Drive ◽  
Fine Tuning ◽  
Positioning Control ◽  
Tuning Method ◽  
Head Positioning ◽  
Servo Controller ◽  
Fixed Structure

As the storage capacity of hard disk drives (HDDs) increases dramatically, the demand for positioning control accuracy of a read/write head of HDD is becoming more stringent. This paper presents a tuning methodology for fixed-structure controllers using the H∞ optimization. The tuning of a PID (Proportional plus Integral plus Derivative) controller for head positioning of an HDD is presented as an application example. The H∞ optimization problem of fixed-structure controllers can be locally solved by using the transformation into an H∞ synthesis problem of static output feedback control. Simulation and experimental results show the effectiveness of the proposed approach as a fine tuning method to improve controller performance without requiring profound knowledge and experiences in manual loop-shaping.

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