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    Air Bearing Dynamics of Sub-Ambient Pressure Sliders During Dynamic Unload

    Source: Journal of Tribology:;1999:;volume( 121 ):;issue: 003::page 553
    Author:
    Yong Hu
    ,
    Paul M. Jones
    ,
    Kangjie Li
    DOI: 10.1115/1.2834103
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The increasing effort to use sub-ambient pressure air bearing sliders for dynamic load/unload applications in magnetic hard disk drives requires desirable air bearing characteristics during the dynamic unload event. This paper establishes air bearing design criteria for achieving a smooth head unload performance, through a correlation study between the modeled unloading air bearing dynamics of two 30 percent proximity recording sub-ambient pressure sliders and motion sequence of the same sliders by a high-speed video camera. It is shown that the air bearing lifting force quickly responds to changes in fly height and pitch, while the suction force is relatively resistant to changes in fly height, but somewhat more sensitive to changes in pitch. This unique distinction results in different decreasing rates between the air bearing lifting and suction forces during the unload process, creating a strong dependence of the unloading characteristics on the location of the suction cavities. Both the modeled unloading air bearing dynamics and experimentally recorded motion sequence illustrate that a toward-trailing-edge located suction force acts to pitch the slider up, while the moment produced by a toward-leading-edge located suction force induces a negative pitch motion, resulting in an excessive flexure deformation and dimple separation. Therefore, placing the suction cavities towards the trailing edge offers a reliable unloading performance for the sub-ambient pressure air bearing sliders.
    keyword(s): Dynamics (Mechanics) , Pressure , Bearings , Suction , Force , Motion , Cavities , Video cameras , Disks , Deformation , Separation (Technology) , Stress , Bending (Stress) AND Bearing design ,
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      Air Bearing Dynamics of Sub-Ambient Pressure Sliders During Dynamic Unload

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/122885
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    • Journal of Tribology

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    contributor authorYong Hu
    contributor authorPaul M. Jones
    contributor authorKangjie Li
    date accessioned2017-05-09T00:01:00Z
    date available2017-05-09T00:01:00Z
    date copyrightJuly, 1999
    date issued1999
    identifier issn0742-4787
    identifier otherJOTRE9-28682#553_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/122885
    description abstractThe increasing effort to use sub-ambient pressure air bearing sliders for dynamic load/unload applications in magnetic hard disk drives requires desirable air bearing characteristics during the dynamic unload event. This paper establishes air bearing design criteria for achieving a smooth head unload performance, through a correlation study between the modeled unloading air bearing dynamics of two 30 percent proximity recording sub-ambient pressure sliders and motion sequence of the same sliders by a high-speed video camera. It is shown that the air bearing lifting force quickly responds to changes in fly height and pitch, while the suction force is relatively resistant to changes in fly height, but somewhat more sensitive to changes in pitch. This unique distinction results in different decreasing rates between the air bearing lifting and suction forces during the unload process, creating a strong dependence of the unloading characteristics on the location of the suction cavities. Both the modeled unloading air bearing dynamics and experimentally recorded motion sequence illustrate that a toward-trailing-edge located suction force acts to pitch the slider up, while the moment produced by a toward-leading-edge located suction force induces a negative pitch motion, resulting in an excessive flexure deformation and dimple separation. Therefore, placing the suction cavities towards the trailing edge offers a reliable unloading performance for the sub-ambient pressure air bearing sliders.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAir Bearing Dynamics of Sub-Ambient Pressure Sliders During Dynamic Unload
    typeJournal Paper
    journal volume121
    journal issue3
    journal titleJournal of Tribology
    identifier doi10.1115/1.2834103
    journal fristpage553
    journal lastpage559
    identifier eissn1528-8897
    keywordsDynamics (Mechanics)
    keywordsPressure
    keywordsBearings
    keywordsSuction
    keywordsForce
    keywordsMotion
    keywordsCavities
    keywordsVideo cameras
    keywordsDisks
    keywordsDeformation
    keywordsSeparation (Technology)
    keywordsStress
    keywordsBending (Stress) AND Bearing design
    treeJournal of Tribology:;1999:;volume( 121 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian