The optimization of the surface shape for a slider to meet the specified load demands under an ultra-thin film lubrication condition has been performed in this study. The optimization process is developed based on the conjugate gradient method in conjunction with a direct problem solver, which is built based on the rarefied-flow theory. The direct problem solver is able to predict the pressure distributions of the rarefied gas flows in the slip-flow, transition-flow, and molecular-flow regimes with a wide range of characteristic inverse Knudsen number. First, the validity of the direct problem solver has been verified by a comparison with the existing information for some particular cases, and then the developed direct problem solver is incorporated with the conjugate gradient method for optimizing the shape profile of the slider surface. The performance of the present optimization approach has also been evaluated. Results show that the shape profile of the slider surface can be efficiently optimized by using the present approach. Thus, a number of cases under various combinations of influential parameters, involving the characteristic inverse Knudsen number and the bearing numbers in the - and -directions, are investigated.
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e-mail: chcheng@mail.ncku.edu.tw
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October 2009
Research Papers
The Optimization for the Shape Profile of the Slider Surface Under Ultra-Thin Film Lubrication Conditions by the Rarefied-Flow Model
Chin-Hsiang Cheng,
Chin-Hsiang Cheng
Professor
Department of Aeronautics and Astronautics,
e-mail: chcheng@mail.ncku.edu.tw
National Cheng Kung University
, Tainan, Taiwan 70101, R.O.C.
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Mei-Hsia Chang
Mei-Hsia Chang
Radio Frequency Group,
National Synchrotron Radiation Research Center
, Hsinchu, Taiwan 30076, R.O.C.
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Chin-Hsiang Cheng
Professor
Department of Aeronautics and Astronautics,
National Cheng Kung University
, Tainan, Taiwan 70101, R.O.C.e-mail: chcheng@mail.ncku.edu.tw
Mei-Hsia Chang
Radio Frequency Group,
National Synchrotron Radiation Research Center
, Hsinchu, Taiwan 30076, R.O.C.
J. Mech. Des. Oct 2009, 131(10): 101010 (10 pages)
Published Online: September 16, 2009
Article history
Received:
December 8, 2008
Revised:
July 30, 2009
Published:
September 16, 2009
Citation
Cheng, C., and Chang, M. (September 16, 2009). "The Optimization for the Shape Profile of the Slider Surface Under Ultra-Thin Film Lubrication Conditions by the Rarefied-Flow Model." ASME. J. Mech. Des. October 2009; 131(10): 101010. https://doi.org/10.1115/1.3213528
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