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TECHNICAL PAPERS

Lapping Control of Hard Disk Drive Heads

[+] Author and Article Information
Youping Mei, Kim A. Stelson

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Dyn. Sys., Meas., Control 123(3), 439-448 (Feb 28, 2000) (10 pages) doi:10.1115/1.1386650 History: Received February 28, 2000
Copyright © 2001 by ASME
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References

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Figures

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Schematic description of the Seagate lapping machine
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Modified beam on elastic foundation model
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Definition of Δs(x) and f(x) in accounting for nonflat surface in beam on elastic foundation model
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Initial SHs of the form h(x)=a+b|x|N
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Final SHs from Seagate control algorithm when the initial SHs are h(x)=a+b|x|N
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Seagate control with a S-shaped initial SH
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Production observation: average final SH profile shape for a population of 2789 bars
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Production observation: evolution of a S-shape initial SH profile to a negative bow
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A flow chart of the proposed control method
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Robustness simulation: final SH profiles without adjusting gains to accommodate parameter variation
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Robustness simulation: final SH profiles by adjusting gains to accommodate parameter variation
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Initial SH profiles for open-loop control test
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Final SH profiles for open-loop control test
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Normalized mode shapes for the identified process parameters
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Evolution of negative bow in Seagate lapping control
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The proposed control method does not turn S-shape into negative bow

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