Documents disponibles écrits par cet auteur

Air bearing surface designs in consideration of thermomechanical actuation efficiency / Shuyu Zhang in Transactions of the ASME . Journal of tribology, Vol. 130 N° 4 (Octobre 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 6 p. Titre : Air bearing surface designs in consideration of thermomechanical actuation efficiency Type de document : texte imprimé Auteurs : Shuyu Zhang, Auteur ; Sung-Chang Lee, Auteur ; Dongman Kim, Auteur Année de publication : 2015 Article en page(s) : 6 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Pressure  Bearings  Design  Force  Transducers Résumé : Thermomechanical actuation (TMA) at the transducer region of the air bearing surface (ABS) protrudes from the transducer toward the recording media. This actuation induces a change in the air bearing pressure and a concomitant lift of the slider. The actual actuation in flying height divided by the TMA protrusion, defined as the TMA efficiency, is intimately coupled to the ABS design. After introducing an expression describing the changes in the air bearing forces due to the TMA protrusion, three approaches are proposed that facilitate the optimization of the ABS design for improving the TMA efficiency. These approaches include (a) reducing the air bearing pressure, (b) reducing the size of the TMA affected area, and (c) decoupling the peak air bearing pressure area from the TMA affected area. To illustrate these approaches, several ABS designs are evaluated by comparing their TMA efficiencies. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468129 [article] Air bearing surface designs in consideration of thermomechanical actuation efficiency [texte imprimé] / Shuyu Zhang, Auteur ; Sung-Chang Lee, Auteur ; Dongman Kim, Auteur . - 2015 . - 6 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N° 4 (Octobre 2008) . - 6 p. Mots-clés : Pressure  Bearings  Design  Force  Transducers Résumé : Thermomechanical actuation (TMA) at the transducer region of the air bearing surface (ABS) protrudes from the transducer toward the recording media. This actuation induces a change in the air bearing pressure and a concomitant lift of the slider. The actual actuation in flying height divided by the TMA protrusion, defined as the TMA efficiency, is intimately coupled to the ABS design. After introducing an expression describing the changes in the air bearing forces due to the TMA protrusion, three approaches are proposed that facilitate the optimization of the ABS design for improving the TMA efficiency. These approaches include (a) reducing the air bearing pressure, (b) reducing the size of the TMA affected area, and (c) decoupling the peak air bearing pressure area from the TMA affected area. To illustrate these approaches, several ABS designs are evaluated by comparing their TMA efficiencies. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468129

Predicting air bearing contamination using air flow pattern analysis / Shuyu Zhang in Transactions of the ASME . Journal of tribology, Vol. 130 N°1 (Janvier 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Titre : Predicting air bearing contamination using air flow pattern analysis Type de document : texte imprimé Auteurs : Shuyu Zhang, Auteur ; Brian D. Strom, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Flow  (Dynamics)  Particulate  matter  Air  flow  Contamination  Bearings  Disks  Mechanisms Résumé : A new method is introduced for predicting particle and liquid droplet contamination on an air bearing surface. The method primarily relies on the analysis of flow patterns nearest the air bearing surface, restricted to two dimensions. In addition, a mathematical model for the vertical flow perpendicular to the disk surface adds clarity to the contamination mechanisms. The predictions compare well with contamination patterns observed in prototype disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1467959 [article] Predicting air bearing contamination using air flow pattern analysis [texte imprimé] / Shuyu Zhang, Auteur ; Brian D. Strom, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Mots-clés : Flow  (Dynamics)  Particulate  matter  Air  flow  Contamination  Bearings  Disks  Mechanisms Résumé : A new method is introduced for predicting particle and liquid droplet contamination on an air bearing surface. The method primarily relies on the analysis of flow patterns nearest the air bearing surface, restricted to two dimensions. In addition, a mathematical model for the vertical flow perpendicular to the disk surface adds clarity to the contamination mechanisms. The predictions compare well with contamination patterns observed in prototype disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1467959

Simulating the air bearing pressure and flying height in a humid environment / Shuyu Zhang in Transactions of the ASME . Journal of tribology, Vol. 130 N°1 (Janvier 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Titre : Simulating the air bearing pressure and flying height in a humid environment Type de document : texte imprimé Auteurs : Shuyu Zhang, Auteur ; Brian Strom, Auteur ; Sung-Chang Lee, Auteur Année de publication : 2008 Article en page(s) : 4 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Pressure  Temperature  Water  vapor  Bearings  Vapor  pressure  Force Résumé : For a hard disk drive operating in a humid environment, the water vapor in the slider’s air bearing is typically compressed beyond its saturation vapor pressure, causing the vapor to condense. Consequently, the air bearing pressure decreases and the slider’s flying attitude adjusts to balance the forces from the suspension. A method for calculating this air bearing response to humid air is presented. Using two air bearing designs, several test cases are analyzed to illustrate the air bearing response for various temperatures and humidity levels. The calculated flying heights agree with those measured in commercial hard disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467969 [article] Simulating the air bearing pressure and flying height in a humid environment [texte imprimé] / Shuyu Zhang, Auteur ; Brian Strom, Auteur ; Sung-Chang Lee, Auteur . - 2008 . - 4 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 N°1 (Janvier 2008) . - 4 p. Mots-clés : Pressure  Temperature  Water  vapor  Bearings  Vapor  pressure  Force Résumé : For a hard disk drive operating in a humid environment, the water vapor in the slider’s air bearing is typically compressed beyond its saturation vapor pressure, causing the vapor to condense. Consequently, the air bearing pressure decreases and the slider’s flying attitude adjusts to balance the forces from the suspension. A method for calculating this air bearing response to humid air is presented. Using two air bearing designs, several test cases are analyzed to illustrate the air bearing response for various temperatures and humidity levels. The calculated flying heights agree with those measured in commercial hard disk drives. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1467969