磁気ヘッドと接触する回転フロッピーディスクの自由振動特性並びにその解析法について

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  • On the natural vibration and method of analysis of a rotating floppy disk with a R/W head system.
  • ジキ ヘッド ト セッショクスル カイテン フロッピー ディスク ノ ジユウ

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A theoretical study of the natural vibrations of rotating floppy disks with a R/W head system is carried out. A solution is obtained by applying both the methods of a one-mode approximation and a multi-modal expansion. It is shown that the one-mode approximation brings almost the same results as the multi-modal analysis when the values of the mass and the stiffness of the head are relatively small. It is also shown that the natural frequency of the system in general decreases with an increase of the disk rotation speed and finally comes to zero at a certain speed. After that, a divergence type of instability appears in the system. When the mass and the stiffness of the R/W head become greater, some flutter type of instability appears in the system before the divergence instability. It is found that the air film within the disk case plays a very important role in stabilizing the behaviour of the rotaing disk.

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