Mc-29 Investigation of Flow Velocity in Actual Hard Disk Drives by Particle-Image-Velocimetry and Fluid Simulation

Kubo, Takashi; Nishijima, Noriyo; Shimizu, Hayato; Hirono, Yoshiyuki; Tokuyama, M.; Nakamura, Shuichi

doi:10.1299/jsmemipe.2003.205

Cited by 7 publications

(5 citation statements)

References 5 publications

(6 reference statements)

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“…Our earlier experimental and numerical simulation studies have shown that large damping, vibration-mode decoupling, and airflow control are important for reducing windage [3]- [6]. Here we report that windage can also be reduced by miniaturizing the HGA and by using the Taguchi Method to optimize the HGA-arm configuration.…”

Section: Introductionmentioning

confidence: 73%

Flow-Induced Vibration of Head Gimbal Assembly

et al. 2004

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This is a report on ways to reduce flow-induced vibration of a head gimbal assembly (HGA), i.e., windage. The relation between flow-induced force and windage was investigated; as was a statistical approach to optimizing an HGA-arm configuration. The investigated HGAs were set between disks in a spin stand, and their windages were measured by using a laser Doppler vibrometer. The amplitude of sway mode was found to be almost in inverse proportion to the square of its frequency because the power spectrum of the airflow between disks is in inverse proportion to the square of its frequency. Miniaturizing HGAs is therefore an effective way to reduce windage because its natural frequencies then become higher. The windage measured for a HGA with a part length of 12, for example, is 40% less than that of one with a part length of 14.5 mm. Optimizing HGA-arm configurations by the Taguchi Method is also useful for reducing windage. The Taguchi Method is a statistical technique for designing products whose performance is not affected by outside conditions. We used an L8 orthogonal array in this investigation and found that optimizing the actuator arm thickness could reduce windage most effectively, the load-beam bend angle, and the arm shape. The windage of an optimized HGA-arm configuration was reduced to about one third that of the initial configuration. This knowledge will be useful in optimizing the parameters of an HGA and a head stack assembly to obtain hard disk drives with higher track densities.Index Terms-Flow-induced vibration, hard disk, head gimbal assembly, Taguchi method.

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Section: Introductionmentioning

confidence: 73%

Flow-Induced Vibration of Head Gimbal Assembly

et al. 2004

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“…These vibrations have a significant affect on the positioning precision of the head and much consideration has been given to the aerodynamics of the disk and the arm to reduce vibrations. Simulation modeling of HDDs has been performed by using large eddy simulation (LES) [1] [2]. However, those numerical models were simplified for reducing mesh construction and calculation time.…”

Section: Introductionmentioning

confidence: 99%

Whole-HDD structure airflow-simulation by voxel mesh method

Ikegawa

Mukai

Watanabe

2009

2009 Asia-Pacific Magnetic Recording Conference

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Numerical ftuid simulation based on the l:oxel mesh method was applied to the whole structure of 3.5-inch hard disk drives, and the results were compal"ed with the experimental results obtained by a PIV (Particle Image Velocimetry) system The results demonstrated that the velocity distributioos agree well, and that this method is useful for modeling a complicated geometry such as that of hard disk drives.

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“…Denissenko (2003) and several other authors revealed via a manifold the patterns of the flow disturbances in similar geometrical configurations. Recently Kubo et al (2003) visualized the flow fields in the co-rotating disks of an HDD submerged in water using a PIV.…”

Section: Introductionmentioning

confidence: 99%

Visualizations of the transitional flow patterns at the mid-span between shrouded co-rotating disks

Kong

Joo

Doh

2007

J Vis

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Transitional air flow patterns at the mid-plane of gap between co-rotating disks in a stationary cylindrical enclosure are visualized under the acceleration condition of disks. The flow visualization is performed using olive oil particles with a laser sheet and CCD camera. On disk spinning-up, the transition flow patterns are clearly observed. The affect of magnitude of acceleration on the onset of transition and the relations of the number of vortex cells in fully turbulent regime of the flow in an outer region of the flow field to the rotating speed are also investigated. The centrifugal effect of particle is evaluated from the comparison with visualization results using hollow glass spheres.

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Mc-29 Investigation of Flow Velocity in Actual Hard Disk Drives by Particle-Image-Velocimetry and Fluid Simulation

Cited by 7 publications

References 5 publications

Flow-Induced Vibration of Head Gimbal Assembly

Flow-Induced Vibration of Head Gimbal Assembly

Whole-HDD structure airflow-simulation by voxel mesh method

Visualizations of the transitional flow patterns at the mid-span between shrouded co-rotating disks

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