ハードディスクドライブのヘッド位置決め制御系におけるディスクフラッタ振動の補償方式

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  • Compensation for Disk-Flutter Vibrations of Head-Positioning Control Systems in Hard Disk Drives
  • ハードディスクドライブ ノ ヘッド イチギメ セイギョケイ ニ オケル ディスクフラッタ シンドウ ノ ホショウ ホウシキ

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In a head-positioning control system of a hard disk drive, the head-positioning accuracy is worsened because of the airflow-induced vibration of disks (called “disk flutter”). Therefore, the control system must compensate for the disk-flutter-induced positioning error. In this paper, we propose a new framework of the head-positioning control system using a resonant filter to suppress the disk-flutter-induced positioning error. The control system uses resonant filters with variable gains that depend on the cylinder number of the head position and the modal shape of the flow-induced vibration of disks. The resonant filter can obtain a circular vector locus that recedes from the unstable point on the Nyquist diagram and can decrease the sensitivity function's gain at a specific frequency. The variable gains are optimized depending on the cylinder number of the head position. As a result, the resonant filter is able to improve the transient response after track-seeking control. The result of track-seeking simulations showed that the proposed method was effective in decreasing the positioning error caused by the disk-flutter-induced vibration and improving the seek time of the hard disk drive.

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