Title :
LQG/LTR frequency loop shaping to improve TMR budget
Author :
Chang, J-K. ; Ho, Hai T.
Author_Institution :
Data Storage Inst., Singapore
fDate :
9/1/1999 12:00:00 AM
Abstract :
In this paper, we introduce a systematic method of designing a track-following servo system for hard disk (HD) drives using discrete-time linear-quadratic Gaussian/loop-transfer recovery (LQG/LTR) design technique, and some statistical knowledge on disturbances. The newly designed controller was implemented on a commercial HD drive and its performance was compared to the resided compensator. An improvement of 10% in track misregistration (TMR) budget was observed
Keywords :
Gaussian distribution; disc drives; discrete time systems; hard discs; magnetic recording noise; servomotors; LQG/LTR frequency loop shaping; TMR budget; discrete-time linear-quadratic Gaussian/loop-transfer recovery design technique; hard disk drives; statistical disturbances; systematic design method; track misregistration; track-following servo system; Actuators; Attenuation; Design optimization; Frequency locked loops; Frequency measurement; Frequency response; Gain measurement; Low-frequency noise; Noise measurement; Sampling methods;
Journal_Title :
Magnetics, IEEE Transactions on
