Title :
Openloop Gain Criteria above the Nyquist Frequency for HDD Head Positioning Control
Author_Institution :
Storage Products Unit., Fujitsu Ltd., Kanagawa
fDate :
Nov. 29 2006-Dec. 1 2006
Abstract :
Head positioning systems of hard disk drives (HDDs) often have mechanical resonant modes above the Nyquist frequency. Suppressing the openloop gain of these modes is a complicated trade off issue in mechanical/control design. Criteria of the openloop gain above the Nyquist frequency is obtained based on frequency response analysis for multi-rate sampled system using frequency response matrix. Examples of designing controller for HDD simulation models show the method is helpful to deal with the trade-off issue.
Keywords :
disc drives; frequency response; hard discs; magnetic heads; matrix algebra; position control; HDD head positioning control; Nyquist frequency; frequency response matrix; hard disk drive; mechanical resonant modes; multirate sampled system; openloop gain; Actuators; Control design; Control systems; Costs; Frequency response; Hard disks; Matrix converters; Resonance; Sampling methods; Stability analysis; Frequency Response; Hard Disk Drive; Nyquist Frequency; Resonant Mode;
Conference_Titel :
Asia-Pacific Magnetic Recording Conference, 2006
Conference_Location :
Singapore
Print_ISBN :
1-4244-0863-6
DOI :
10.1109/APMRC.2006.365906
