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http://dx.doi.org/10.5302/J.ICROS.2003.9.9.679

Adaptive Suppression of Mechanical Resonance in High-Density Disk Drives  

강창익 (제주대학교 해양계측공학과)
김창환 (대전대학교 컴퓨터공학부)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.9, no.9, 2003 , pp. 679-691 More about this Journal
Abstract
The band-width of disk drive servo system is rapidly increasing for the robustness to external disturbance as the track density is increasing. The increase of the band-width may cause mechanical resonance of an actuator. In disk drive servo system, a notch filter is usually used to suppress the mechanical resonance of the actuator. However, the resonance frequency differs from drive to drive because of manufacturing tolerance and varies with temperature even within a single drive. The variation of resonance frequency degrades the suppression performance of the notch filter. In this paper, we present an adaptive digital notch filter that identifies the resonance frequency of the disk drive servo actutaor precisely and adjusts automatically its center frequency. For this, we design an adaptive FIR digital filter for the estimation of the resonance frequency. The estimation filter identifies the resonance frequency adaptively using the output signal generated from the servo system, which is excited with an excitation signal including all the expected resonance frequency components. We prove mathematically the convergence of the resonance frequency estimation filter. Furthermore, in order to demonstrate the practical use of our work, we present some experimental results using a commercially available disk drive.
Keywords
disk drive; mechanical resonance; adaptive notch filter; estimation filter;
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