The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform

Bo Liu - One of the best experts on this subject based on the ideXlab platform.

  • Further Study of the Effect of Water Vapor on Slider Air Bearing
    IEEE Transactions on Magnetics, 2009
    Co-Authors: Bo Liu
    Abstract:

    It has been proved that water vapor in moist air contributes to slider air-Bearing Pressure in a totally different way from dry air. It is a very good first order approximation to take a constant water vapor Pressure inside and outside the interface. The simulated slider flying height and attitude in moist air are different from that in dry air and the higher the relative humidity the bigger the difference. This work is a further study of the effect of water vapor on slider air Bearing. In this paper, the effect of slider air-Bearing Pressure on the saturated water vapor Pressure is explained. The adsorbed water film thickness on slider and disk surfaces as a function of relative humidity at different temperatures is calculated. The effects of slider air-Bearing Pressure, temperature, slider-disk spacing, and relative humidity on the water vapor Pressure in slider-disk interface are studied. An empirical equation is developed for the calculation of accurate water vapor Pressure distribution in slider-disk interface.

  • Contribution of water vapor to slider air-Bearing Pressure in hard disk drives
    Applied Physics Letters, 2007
    Co-Authors: Bo Liu
    Abstract:

    Water vapor in humid air contributes to slider air-Bearing Pressure in a totally different way from that of dry air. Water vapor Pressure keeps constant in slider-disk interface and is identical to the water vapor Pressure outside the interface. The simulated slider flying height and attitude in humid air are different from that in dry air and the higher the relative humidity the bigger the differences.

  • Lubricant transfer from disk to slider in hard disk drives
    Applied Physics Letters, 2007
    Co-Authors: Bo Liu
    Abstract:

    The physics behind lubricant transfer from disk to slider and lubricant accumulation on the slider in hard disk drives is explained. The effect of slider air Bearing Pressure on the lubricant transfer is discussed. It is found that the lubricant transfer is not affected by slider air Bearing Pressure. Lubricant molecular weight plays a dominant role in the lubricant transfer and lubricant accumulation. The amount of lubricant transfer and accumulation decreases dramatically with the increase in lubricant molecular weight. A thinner lubricant and higher bonding ratio of lubricant on disk surface reduce the lubricant transfer and accumulation obviously.

Baki M Karamis - One of the best experts on this subject based on the ideXlab platform.

  • effects of shaft surface texture on journal Bearing Pressure distribution
    Journal of Materials Processing Technology, 2005
    Co-Authors: Cem Sinanoglu, Fehmi Nair, Baki M Karamis
    Abstract:

    Abstract This paper presents an analysis of the Pressure development of journal Bearing in a various shaft surface texture and velocity variations using a proposed neural network. The effects of the parameters, which act on performances of journal Bearing, on the Pressure development and load-carriage capacity have been examined such as the number of revolution and shaft surface texture. The data from the experiments are used as learning information for the neural network to establish a reliable prediction model that can be applied to journal Bearings and the model's performance is verified.

George Tyndall - One of the best experts on this subject based on the ideXlab platform.

  • Air Bearing Surface Designs in Consideration of Thermomechanical Actuation Efficiency
    Journal of Tribology, 2008
    Co-Authors: Shuyu Zhang, Brian D. Strom, Sung-chang Lee, Dongman Kim, Joerg Ferber, George Tyndall
    Abstract:

    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.

  • simulating the air Bearing Pressure and flying height in a humid environment
    Journal of Tribology-transactions of The Asme, 2008
    Co-Authors: Shuyu Zhang, Brian D. Strom, George Tyndall
    Abstract:

    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.

  • Calculating air Bearing Pressure and flying height in a humid environment
    Asia-Pacific Magnetic Recording Conference 2006, 2006
    Co-Authors: Shuyu Zhang, Brian Strom, George Tyndall
    Abstract:

    This paper proposes a model describing the adjustment of air Bearing Pressure in a humid environment. It is shown that the FH of a slider is strongly dependent on the partial Pressure of water present in a hard disk drive. The FH loss induced by the humidity effect are calculated by introducing the adjusted Pressure into the air Bearing model. The model output is found to agree with the changes in fly height measured by experiment. Finally, the model is applied to analyze the FH sensitivity to temperature changes in a humid condition.

Cem Sinanoglu - One of the best experts on this subject based on the ideXlab platform.

  • effects of shaft surface texture on journal Bearing Pressure distribution
    Journal of Materials Processing Technology, 2005
    Co-Authors: Cem Sinanoglu, Fehmi Nair, Baki M Karamis
    Abstract:

    Abstract This paper presents an analysis of the Pressure development of journal Bearing in a various shaft surface texture and velocity variations using a proposed neural network. The effects of the parameters, which act on performances of journal Bearing, on the Pressure development and load-carriage capacity have been examined such as the number of revolution and shaft surface texture. The data from the experiments are used as learning information for the neural network to establish a reliable prediction model that can be applied to journal Bearings and the model's performance is verified.

Hasan Bas - One of the best experts on this subject based on the ideXlab platform.

  • investigation of the tribological properties of silicon containing zinc aluminum based journal Bearings
    Tribology International, 2004
    Co-Authors: Hamdullah Cuvalci, Hasan Bas
    Abstract:

    Abstract In this study, frictional behavior of thin-walled journal Bearings produced from Zn–Al–Cu–Si alloys was investigated using a purpose-built journal Bearing test rig. The alloys were produced by permanent mould casting. Mechanical properties such as ultimate tensile strength, elongation, hardness and microstructure of these alloys were determined. The friction properties of the Bearings produced from these alloys were also investigated. In this investigation, the effects of surface roughness and Bearing Pressure on the frictional properties of the journal Bearings were taken into account. The results showed that friction factor decreased with increasing Bearing Pressure especially in the mixed and full-film lubrication zones. It was found that high surface roughness led to high friction factor. The ZnAl27Cu2Si1 and ZnAl40Cu2Si1 Bearings showed full Stribeck curve tendency while ZnAl27Cu2Si2 Bearing did not exhibit the typical diagram having no full-film lubrication zone at the Pressure of 0.7 and 1.1 MPa.