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TECHNICAL PAPERS

Time-Frequency Analysis of Slider Dynamics and the Effect of Lubricant

[+] Author and Article Information
Saurabh K. Deoras, Frank E. Talke

Center for Magnetic Recording Research, Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, California 92093-0401

J. Tribol 126(3), 559-564 (Jun 28, 2004) (6 pages) doi:10.1115/1.1695568 History: Received November 21, 2002; Revised July 11, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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References

Tanaka,  H., Yonemura,  S., and Tokisue,  H., 2001, “Slider Dynamics During Continuous Contact With Textured and Smooth Disks in Ultra Low Flying Height,” IEEE Trans. Magn., 37(2), pp. 906–911.
Menon, A. K., 1999, “Critical Requirements for 100 Gb/in2 Head/Disk Interface,” ASME Proc. Symp. Interface Technology Towards 100 Gb/in2 , 9 , ASME, New York, pp. 1–9.
Knigge,  B., and Talke,  F., 2001, “Dynamics of Transient Events at the Head/Disk Interface,” Tribol. Int., 34(7), pp. 453–460.
Zeng,  Q. H., and Bogy,  D. B., 1999, “Experimental Evaluation of Stiffness and Damping of Slider Air Bearings in Hard Disk Drives,” ASME J. Tribol., 121, pp. 102–107.
Wang,  S., Chang,  Y. C., and Liu,  J. J., 1999, “A Novel Drag Test for Observing Lubricant Redistribution Due to Head-Disk Interactions,” IEEE Trans. Magn., 35(5), pp. 2448–2450.
Liu, B., Zhu, Y. L., and Li, Y. H., 1999, “Experimental Study of Slider-Disk Interaction in a Nanometer Spaced Head-Disk Interface,” IEICE Trans. Electron., 1999, 7 (1), pp. 2148–2154.
Zhou,  L., Talke,  F., and Kato,  K., 2002, “The Effect of Slider Surface Texture on Slider Flyability and Lubricant Migration Under Near Contact Conditions,” Tribol. Int., 36, pp. 269–277.
Xu,  J., Tokisue,  H., Tanaka,  H., and Matsumota,  M., 2002, “Contact Vibrations of Micro-Textured Sliders,” ASME J. Tribol., 124(2), pp. 281–287.
Liu,  Y., Jiaa,  C. L., and Eltoukhy,  A., 1997, “Acoustic Emission Study of Lubricant Effect on Proximity Contact Recording,” IEEE Trans. Magn., 33(5), pp. 3160–3162.
Kohira,  H., Tanaka,  H., Matsumota,  M., and Talke,  F., 2001, “Investigation of Slider Vibrations Due to Contact With a Smooth Disk Surface,” ASME J. Tribol., 123(3), pp. 616–623.
Gao,  C., Lee,  Y. C., Chao,  J., and Russak,  M., 1995, “Dip-Coating of Ultra-Thin Liquid Lubricant and Its Control for Thin-Film Magnetic Hard Disks,” IEEE Trans. Magn., 31(6), pp. 2982–2984.
Deoras,  S., Chun,  S., Vurens,  G., and Talke,  F., 2003, “Spreading and Mobility Analysis of PFPE Lubricants Using Surface Reflectance Analyzer (SRA),” Tribol. Int., 36, pp. 241–246.
Cohen, L., 1995, Time-Frequency Analysis, Prentice-Hall PTR.
Harrison,  J., Altshuler,  K., and Huynh,  C., 1999, “An Explanation of the Observed Frequency Domain Behavior of Head-Disk Interface Resonances in the Proximity Recording Regime,” IEEE Trans. Magn., 35(2), pp. 933–938.
Ljung, L., 1999, System Identification, Prentice-Hall PTR.

Figures

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Schematic of experimental setup
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Experimental setup: disk on a spin-stand; laser focused on gimbal
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Slider ABS design and mode shapes
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LDV signal: (a) unprocessed signal, (b) cross correlated and averaged signal
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Power spectrum of velocity signal
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Spectrogram of velocity signal
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Wigner-Ville distribution of velocity signal
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Time-frequency representation of slider-scratch impact: slider body modes
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Displacement signal: various sections
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Defining the system model
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Bode diagram of the model
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Pitch-2 amplitude as a function of disk velocity
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Effect of lubricant on settling time
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Damping coefficients in percent

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