Topological design sensitivity on the air bearing surface of head slider |
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Authors: | Sang-Joon?Yoon Min-Soo?Kim Email author" target="_blank">Dong-Hoon?ChoiEmail author |
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Affiliation: | (1) Center of Innovative Design Optimization Technology, Hanyang University, 133-791 Seoul, Korea |
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Abstract: | In this study, a topological design sensitivity of the air bearing surface (ABS) is suggested by using an adjoint variable
method. The discrete form of the generalized lubrication equation based on a control volume formulation is used as a compatible
condition. A residual function of the slider is considered as an equality constraint function, which represents the slider
in equilibrium. The slider thickness parameters at all grid cells are chosen as design variables since they are the topological
parameters determining the ABS shape. Then, a complicated adjoint variable equation is formulated to directly handle the highly
nonlinear and asymmetric coefficient matrix and vector in the discrete system equation of air-lubricated slider bearings.
An alternating direction implicit (ADI) scheme is utilized for the numerical calculation. This is an efficient iterative solver
to solve large-scale problem in special band storage. Then, a computer program is developed and applied to a slider model
of a sophisticated shape. The simulation results of design sensitivity analysis (DSA) are directly compared with those of
FDM at the randomly selected grid cells to show the effectiveness of the proposed approach. The overall distribution of DSA
results are reported, clearly showing the region on the ABS where special attention should be given during the manufacturing
process. |
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Keywords: | Design Sensitivity Analysis(DSA) Air Bearing Surface(ABS) |
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