Servo control design for a hard disk drive based on estimated head position at high sampling rates

Ioannou, Pétros; Xu, Haojian; Fi̇dan, Barış

doi:10.1109/acc.2003.1239108

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The plant used for demonstration models that of a commercial HDD with several high-frequency modes, which must be suppressed. It is similar to the identified plant in [35]. A bode plot of the plant is shown in Fig.…”

Section: Simulationsmentioning

confidence: 79%

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Adaptive Mode-Suppression and Disturbance-Rejection Scheme With Application to Disk Drives

Levin

Ioannou

2009

IEEE Trans. Contr. Syst. Technol.

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The goal of a track-following controller for a disk drive is to maintain as close to perfect tracking as possible. Better tracking allows for more data to be stored on a single disk. There are several factors which make this control problem difficult, such as high-frequency resonant modes, unknown disturbances, and a preset sampling rate. The resonant modes of a disk drive are often uncertain and vary between units and can also lie near or beyond the Nyquist frequency. Suppressing these modes can be difficult. However, a multirate adaptive notch filter and adaptive bandwidth controller is proposed to suppress these resonant modes. A robust online estimator that estimates the mode frequencies is used to allow the multirate adaptive notch filter to track the disk drive's modes. By adding a multirate scheme to the adaptive notch filter, it can suppress modes at higher frequencies, which are close to or beyond the Nyquist frequency of the preset sampling rate. As the multirate adaptive notch filter tracks the plant mode frequencies, the adaptive bandwidth controller ensures that stability and performance requirements are satisfied by using the online estimate of the mode frequencies. An adaptive disturbance rejector is added to the adaptive mode-suppression scheme and broken into two parts: a part to suppress the repeatable runout and another to attenuate the residual disturbance by using a neural model. Both parts are adapted online and combined with the mode-suppression scheme to ensure good disturbance rejection even in the presence of unknown or changing resonant modes. Simulation results with a hard disk drive as the application are included and show that the adaptive mode-suppression scheme is able to maintain stability and better performance than a nonadaptive counterpart for an uncertain resonant-mode frequency. When combined with the adaptive disturbance-rejection scheme, stability is maintained and an improvement of as much as 14.3% in 3 is seen. This improvement in tracking can allow for data to be stored more densely on a single disk, providing larger storage media for the same size of disk drive.

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Section: Simulationsmentioning

confidence: 79%

“…The new disturbance is modeled as (35) Therefore, the system output now becomes (36) To cancel the disturbance, the control signal should be . Since the computed model of the HDD may be, and the case presented in simulations is, nonminimum phase, the inverse is unstable.…”

Section: ) Rro Disturbance Rejectionmentioning

confidence: 99%

Adaptive Mode-Suppression and Disturbance-Rejection Scheme With Application to Disk Drives

Levin

Ioannou

2009

IEEE Trans. Contr. Syst. Technol.

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show abstract

Multirate adaptive notch filter with an adaptive bandwidth controller for disk drives

Levin

Ioannou

2008

2008 American Control Conference

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Servo control design for a hard disk drive based on estimated head position at high sampling rates

Cited by 2 publications

References 16 publications

Adaptive Mode-Suppression and Disturbance-Rejection Scheme With Application to Disk Drives

Adaptive Mode-Suppression and Disturbance-Rejection Scheme With Application to Disk Drives

Multirate adaptive notch filter with an adaptive bandwidth controller for disk drives

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