Abstract
This paper deals with an excitation mechanism of the flow induced disk vibration of HDD. Since the shroud clearance is very influential factor in the disk vibration, we examined experimentally how the aerodynamic excitation force in the shroud clearance generates. A flow condition in the shroud clearance and the relation between the flow condition and the disk vibration were investigated. Experiments show that making the shroud clearance small leads to reduction of the excitation force and that the excitation force occurs mainly near the disk edge. The vibration amplitude of the disk has a relation with the Reynolds number on the shroud clearance as a characteristic length, so it is considered necessary to make the circumferential flow in the shroud clearance less turbulent for reduction of vibration of the disks.
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