Noise impact on servo TMR

Ho, H.T.

doi:10.1109/acc.1997.611989

Cited by 30 publications

(10 citation statements)

References 1 publication

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“…The noise and disturbances and their impact on HDD servo loop are elaborated by Abramovitch et al [6], Ho [7] and Du et al [9]. For a simplified HDD servo loop as in Fig.…”

Section: Basic Conceptmentioning

confidence: 99%

Radial error propagation issues in self-servo track writing technology

Ye¹,

Sng²,

et al. 2002

IEEE Trans. Magn.

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Conventional servo track writing needs external devices to position heads in hard disk drives to write servo pattern. In self-servo track writing (SSTW), the position reference is regenerated from previous written tracks and a servo pattern is propagated to cover the disk in a progressive mode. Error will propagate and compound in this process. In this paper, the radial error propagation is discussed and a containment scheme is established. Furthermore, 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.Index Terms-Hard disk drive, self-servo track writing, servo track writing.

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“…The noise and disturbances and their impact on HDD servo loop are elaborated by Abramovitch et al [6], Ho [7] and Du et al [9]. For a simplified HDD servo loop as in Fig.…”

Section: Basic Conceptmentioning

confidence: 99%

Radial error propagation issues in self-servo track writing technology

Ye¹,

Sng²,

et al. 2002

IEEE Trans. Magn.

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“…Traditional way of control Manuscript design is to follow design specifications such as a certain open loop 0 dB cross over frequency, error rejection transfer function peak, etc. To increase the servo loop bandwidth while avoiding the amplification of the unwanted noise and disturbances, detailed plant models, including noise and disturbance models, have been studied to facilitate the servo control and mechanical system (or access system) design [5], [13], [1]. Modern control theories allow the optimization of certain kinds of norms such as or norms, or even mixed norm with or without using the disturbance models.…”

Section: Introductionmentioning

confidence: 99%

A dual-stage control design for high track per inch hard disk drives

2001

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This paper proposes an optimization based control scheme for a dual-stage hard disk drive servo system to maximize the tracking accuracy given the actuator bandwidth limitations without knowing the mechanical disturbance model. We proposed to add an outer loop, selected based on optimization of the Youla parameters, to the usual dual-stage controller for tracking accuracy improvement. The Youla parameters are bounded based on specifications of minimum bandwidth, phase margin, and gain margin, and maximum bandwidth limitations. Time domain and frequency domain simulations were performed to show the effectiveness of the design. The tracking accuracy with respect to various noise and disturbance levels was considered. The results suggested that for the noise and disturbance model considered, the mechanical disturbance must be reduced considerably to achieve higher TPI.Index Terms-Dual-stage servo, hard disk drive, optimal control, servo system.

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“…So far, a lot of research work have been carried out to obtain the disturbance/noise models ( [2], [37], [74] and [170]). An analysis of the vibrations induced by fluid bearing and ball bearing was reported in [30].…”

Section: Disturbance Modeling In Hddsmentioning

confidence: 99%

Nonlinear control designs for hard disk drive servos

Li¹

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Noise impact on servo TMR

Cited by 30 publications

References 1 publication

Radial error propagation issues in self-servo track writing technology

Radial error propagation issues in self-servo track writing technology

A dual-stage control design for high track per inch hard disk drives

Nonlinear control designs for hard disk drive servos

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