Title :
Flow-induced vibration of a head gimbal assembly under various conditions
Author :
Nakamura, Shigeo ; Aduma, Ryouhei ; Takahashi, Haruhide ; Wakatsuki, Kousaku ; Hagiya, Shinobu
Author_Institution :
Hitachi Global Storage Technol. Japan Ltd., Odawara, Japan
Abstract :
The flow-induced vibration of a head gimbal assembly (HGA), known as windage, is an obstacle to achieving higher track densities in hard disk drives (HDDs). We examine the characteristics of windage in this paper with the goal of enabling the development of smaller-windage HGAs. We used a 14.5-mm-length (from swage hole center to dimple) HGA in our study. The windage was measured by a laser Doppler vibrometer in a spin stand under various conditions, such as different slider radius locations (inner diameter, medium diameter, and outer diameter), disk-rotational speeds, Z heights (distance from arm to disk), and temperatures. With respect to the slider radius location, windage was much greater when the slider was on the outer diameter rather than at other positions. When the slider was positioned at a fixed location, the windage was proportional to the square of the disk rotational speed. At high temperatures, the resonant frequencies decreased and their amplitudes increased. For some resonance modes, there was an optimal Z height. These findings will be useful for evaluating HGAs and optimizing HGAs through experimental design.
Keywords :
disc drives; hard discs; magnetic heads; vibrations; 14.5 mm; disk rotational speeds; flow-induced vibration; hard disk drives; head gimbal assembly; laser Doppler vibrometer; slider radius locations; windage; Assembly; Design for experiments; Design optimization; Hard disks; Resonance; Resonant frequency; Swaging; Temperature; Velocity measurement; Vibrometers; Flow-induced vibration; hard disk drive; head gimbal assembly;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.840304