NDLI: Aerodynamic Damping on Vibration of Rotating Disks and Effects of Shroud and Top Cover

Content Provider	IEEE Xplore Digital Library
Author	Eguchi, T.
Copyright Year	1965
Abstract	Aerodynamic damping on vibration of rotating disks surrounded by a shroud was experimentally investigated. Hammer tests were conducted in a vacuum and in air, and a curve-fit technique was used to estimate natural frequencies and modal damping ratios of disk modes precisely from measured frequency responses. The experimental results revealed that aerodynamic damping is dominant rather than structural damping and independent of the amplitude of the disk vibration. The relationships of aerodynamic damping with disk-to-shroud and disk-to-cover gaps were also investigated. When the disk-to-shroud gap is narrower than 0.3 mm, the damping ratios increase rapidly as the disk-to-shroud gap narrows and the rate of increase depends on the disk mode. For the (0, 0) mode, the damping ratio is inversely proportional to the cube of the disk-to-shroud gap, which agrees with our previous theoretical prediction. In contrast, when the disk-to-shroud gap is wider than 1 mm, the rate of increase is slow and varies insignificantly with disk mode.
Sponsorship	IEEE Magnetics Society
Starting Page	3742
Ending Page	3745
Page Count	4
File Size	576003
File Format	PDF
ISSN	00189464
Volume Number	44
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aerodynamics Damping Frequency estimation Disk drives Vibration measurement Force measurement Testing Hard disks Laboratories Vacuum technology vibration magnetic disk drive rotating disk
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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