Volume 3, Issue 6
Investigation of HDD Ramp Unloading Processes with an Efficient Scheme

Yan Liu & Hejun Du

Adv. Appl. Math. Mech., 3 (2011), pp. 716-728.

Published online: 2011-03

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  • Abstract

Ramp load/unload (L/UL) mechanisms are widely used to rest sliders in hard disk drives (HDDs). Loading/unloading a slider swiftly and smoothly is crucial in a HDD design. A novel, efficient simulation scheme is proposed to investigate the behaviors of a head disk interface (HDI) in ramp unloading processes. A dual scale model is enabled by decoupling the nano-meter scale change of an air bearing and the micro- or milli-meter scale deformation of a suspension. A modified Reynolds equation governing the air bearing was solved numerically. The slider design was characterized with performance functions. Three stages in an unloading process were analyzed with a lumped parameter suspension model. Key parameters for the model were estimated with a comprehensive finite element suspension model. Finally, simulation results are presented for a commercial HDI design.

  • Keywords

Hard disk drive ramp unloading head-disk interface suspension Reynolds equation performance surfaces

  • AMS Subject Headings

65P40

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{AAMM-3-716, author = {Yan Liu and Hejun Du}, title = {Investigation of HDD Ramp Unloading Processes with an Efficient Scheme}, journal = {Advances in Applied Mathematics and Mechanics}, year = {2011}, volume = {3}, number = {6}, pages = {716--728}, abstract = {

Ramp load/unload (L/UL) mechanisms are widely used to rest sliders in hard disk drives (HDDs). Loading/unloading a slider swiftly and smoothly is crucial in a HDD design. A novel, efficient simulation scheme is proposed to investigate the behaviors of a head disk interface (HDI) in ramp unloading processes. A dual scale model is enabled by decoupling the nano-meter scale change of an air bearing and the micro- or milli-meter scale deformation of a suspension. A modified Reynolds equation governing the air bearing was solved numerically. The slider design was characterized with performance functions. Three stages in an unloading process were analyzed with a lumped parameter suspension model. Key parameters for the model were estimated with a comprehensive finite element suspension model. Finally, simulation results are presented for a commercial HDI design.

}, issn = {2075-1354}, doi = {https://doi.org/10.4208/aamm.10-m1001}, url = {http://global-sci.org/intro/article_detail/aamm/192.html} }
TY - JOUR T1 - Investigation of HDD Ramp Unloading Processes with an Efficient Scheme AU - Yan Liu & Hejun Du JO - Advances in Applied Mathematics and Mechanics VL - 6 SP - 716 EP - 728 PY - 2011 DA - 2011/03 SN - 3 DO - http://doi.org/10.4208/aamm.10-m1001 UR - https://global-sci.org/intro/article_detail/aamm/192.html KW - Hard disk drive KW - ramp KW - unloading KW - head-disk interface KW - suspension KW - Reynolds equation KW - performance surfaces AB -

Ramp load/unload (L/UL) mechanisms are widely used to rest sliders in hard disk drives (HDDs). Loading/unloading a slider swiftly and smoothly is crucial in a HDD design. A novel, efficient simulation scheme is proposed to investigate the behaviors of a head disk interface (HDI) in ramp unloading processes. A dual scale model is enabled by decoupling the nano-meter scale change of an air bearing and the micro- or milli-meter scale deformation of a suspension. A modified Reynolds equation governing the air bearing was solved numerically. The slider design was characterized with performance functions. Three stages in an unloading process were analyzed with a lumped parameter suspension model. Key parameters for the model were estimated with a comprehensive finite element suspension model. Finally, simulation results are presented for a commercial HDI design.

Yan Liu & Hejun Du. (1970). Investigation of HDD Ramp Unloading Processes with an Efficient Scheme. Advances in Applied Mathematics and Mechanics. 3 (6). 716-728. doi:10.4208/aamm.10-m1001
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