Published in

Institute of Electrical and Electronics Engineers, IEEE Transactions on Industrial Electronics, 10(55), p. 3751-3757

DOI: 10.1109/tie.2008.928153

9th IEEE International Workshop on Advanced Motion Control, 2006.

DOI: 10.1109/amc.2006.1631641



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Vibration control above the Nyquist frequency in hard disk drives

Journal article published in 1 by Takenori Atsumi, Atsushi Okuyama, Shinsuke Nakagawa
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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In conventional hard disk drives, a control system compensates the mechanical resonance by using a multi-rate notch filter that can decrease the gain above the nyquist frequency. However, such a control system (which is based on the small-gain theorem) only avoids becoming unstable by mechanical resonances. It cannot suppress the vibrations caused by these resonances. In response to these problems, we proposed a design method for a sampled-data control system that uses frequency responses of a controlled object and a digital controller. Our method can calculate the norm of the sensitivity function in a sampled-data system and design a control system that decreases vibrations that occur at frequencies above the nyquist frequency. When the method was applied to the head-positioning system of a hard disk drive, we found that a mechanical resonance, in which the frequency was above the nyquist frequency, could be stabilized by the phase condition, and the vibrations could be decreased by the control system