Journal ArticleDOI
Disturbance modeling and control design for self-servo track writing
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In this article, an H/sub 2/ controller together with a feedforward compensator is designed via linear matrix inequality approach to minimize the propagation tracking error from one track to the next.Abstract:
The major disturbances in self-servo track writing are identified and modeled. Based on the disturbance models, an H/sub 2/ controller together with a feedforward compensator is designed via linear matrix inequality approach to minimize the propagation tracking error from one track to the next. Furthermore, the error propagation containment effectiveness of the optimal H/sub 2/ control is compared with that of proportional-integral-derivative (PID) and proportional-derivative (PD) feedback controls with the feedforward compensators. Our results show that the propagation tracking error is improved by 27% with the H/sub 2/ control compared with that by PID control.read more
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References
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Journal ArticleDOI
Vibration control of a PZT actuated suspension dual-stage servo system using a PZT sensor
TL;DR: In this paper, a vibration suppression controller for a PZT actuated suspension dual-stage servo system is proposed. But the controller is designed using the H/sub /spl infin// control design method, and the attenuation of 15 dB can be achieved for both the suspension sway mode and the VCM butterfly mode.
Journal ArticleDOI
Major HDD TMR sources and projected scaling with TPI
R. Ehrlich,D. Curran +1 more
TL;DR: In this paper, the authors identify the major sources of on-track, self-induced, non-synchronous TMR (track misregistration) in a hard disk drive with a track-density of 4400 TPI (tracks per inch) and a rotational rate of 90 Hz.
Journal ArticleDOI
A phase-stabilized servo controller for dual-stage actuators in hard disk drives
TL;DR: In this article, a phase-stabilized servo controller based on a Nyquist plot for moving-suspension dual-stage actuators was developed, which uses the suspension resonances of a PZT microactuator to compensate for the track misregistration due to windage disturbance caused by suspension vibration.
Journal ArticleDOI
Radial error propagation issues in self servo track writing technology
TL;DR: Experimental results of SSTW on a head-disk assembly with blank media and off-the-shelf electronics are analyzed to show the effectiveness of error containment in self-radial propagation.
Proceedings ArticleDOI
Decomposition of baseline noise sources in hard disk position error signals using the PES Pareto method
TL;DR: In this article, the authors used the position error signal (PES) Pareto method and measurement techniques for isolating noise sources to decompose the PES of a Lynx II hard disk drive manufactured by HP.