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Magnetic Storage

A Fast Implicit Algorithm for Time-Dependent Dynamic Simulations of Air Bearing Sliders

[+] Author and Article Information
Wei Hua1

 Data Storage Institute, (A*STAR) Agency for Science, Technology and Research, DSI Building, 5 Engineering Drive 1, Singapore 117608hua_wei@dsi.a-star.edu.sg

Shengkai Yu, Weidong Zhou, Kyaw Sett Myo

 Data Storage Institute, (A*STAR) Agency for Science, Technology and Research, DSI Building, 5 Engineering Drive 1, Singapore 117608

1

Corresponding author.

J. Tribol. 134(3), 031901 (Jun 12, 2012) (8 pages) doi:10.1115/1.4006134 History: Received June 14, 2011; Revised February 12, 2012; Online June 12, 2012; Published June 18, 2012

An unstructured triangular mesh is successfully applied to the static simulations of air bearing sliders due to its flexibility, accuracy and mesh efficiency in capturing various complex rails and recess wall regions of air bearing surface, as well as fast simulation speed. This paper introduces a new implicit algorithm with second order time accuracy for the time-dependent simulations of the slider dynamics and available for the unstructured triangular mesh. The new algorithm is specially developed for the finite volume method. Since the algorithm has second order time accuracy, it provides the flexibility of applying various time steps while guaranteeing the numerical accuracy and convergence. Moreover, the unstructured triangular mesh is highly efficient and fewer nodes are used. Finally, due to the small variation of flying attitude between two neighboring time steps, it is especially efficient for iteration methods which are used in the finite volume method. As a result, the algorithm shows very fast speed in time-dependent dynamic simulations. Simulation studies are conducted on the flying dynamics of a thermal flying-height control slider after external excitations. The simulation results are compared with the simulation results obtained by the rectangular mesh based on the finite element method. It is observed that the simulation results are well correlated. The fast Fourier transform is also employed to analyze the air bearing frequencies. It is indicated that the new algorithm is of high efficiency and importance for time-dependent dynamic simulations.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The dynamic model of a slider flying on a rotating disk

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Figure 2

Control volume for the vertex based finite volume method: (a) Unstructured triangular and (b) Integral around vertex i

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Figure 3

The ABS of the slider and its pressure profile at the static state with no thermal protrusion: (a) ABS profile, (b) isometric view of air bearing pressure profile and (c) top view

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Figure 4

Iteration procedure to get the flying height and thermal protrusion

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Figure 5

The 2-D disk surface waviness for simulations

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Figure 6

Minimum flying height versus time: (a) based on unstructured triangular mesh and FVM and (b) based on structured rectangular mesh and FEM. Between 400 and 500 μs, the figures are zoomed in to compare with the static results listed in Table 1.

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Figure 7

Pitch angle versus time: (a) based on unstructured triangular mesh and FVM and (b) based on structured rectangular mesh and FEM. Between 400 and 500 μs, the figures are zoomed in to compare with the static results listed in Table 1.

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Figure 8

Roll angle versus time: (a) based on unstructured triangular mesh and FVM and (b) based on structured rectangular mesh and FEM. Between 400 and 500 μs, the figures are zoomed in to compare with the static results listed in Table 1.

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Figure 9

FFT of pitch angles: (a) based on unstructured triangular mesh and FVM and (b) based on structured rectangular mesh and FEM

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Figure 10

FFT of roll angles: (a) based on unstructured triangular mesh and FVM and (b) based on structured rectangular mesh and FEM

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