한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제16권3호
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  • Pages.255-262
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  • 2006
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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재배치 시간-주파수 해석을 이용한 슬라이더 공기베어링의 비정상 거동 연구

Study on the Nonstationary Behavior of Slider Air Bearing Using Reassigned Time -frequency Analysis

  • 정태건 (건국대학교 기계항공공학부)
  • 발행 : 2006.03.01
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초록

Frequency spectrum using the conventional Fourier analysis gives adequate information about the dynamic characteristics of the slider air bearing for the linear and stationary cases. The intermittent contacts for the extremely low flying height, however, generate nonlinear and nonstationary vibration at the instant of contact. Nonlinear dynamic model should be developed to simulate the impulse response of the air bearing during slider-disk contact. Time-frequency analysis is widely used to investigate the nonstationary signal. Several time-frequency analysis methods are employed and compared for the slider vibration signal caused by the impact against an artificially induced scratch on the disk. The representative Wigner-Ville distribution leads to the severe interference problem by cross terms even though it gives good resolution both in time and frequency. The smoothing process improves the interference problem at the expense of resolution. In order to get the results with good resolution and little interference, the reassignment method is proposed. Among others the reassigned Gabor spectrogram shows the best resolution and readability with negligible interference.

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참고문헌

  1. Yoon, S. J., Kim, D. I., Jeong, T. G. and Choi, D. H., 2002, 'Optimizations of Air-lubricated Slider Bearings Using the Reduced-basis Concept,' IEEE Transactions on Magnetics, Vol. 38, No. 5, pp. 2174-2176 https://doi.org/10.1109/TMAG.2002.802792
  2. Yoon, S. J., Kim, S. H., Choi, D. H., Jeong, T. G. and Kim, S. K., 2003, 'Optimal Design of Optical Flying Head for Near-field Recording,' Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 13, No. 10, pp. 785-790 https://doi.org/10.5050/KSNVN.2003.13.10.785
  3. Wang, R. H., Nayak, V., Huang, F.-Y., Tang, W. and Lee, F., 2001, 'Head-disk Dynamics in the Flying, Near Contact, and Contact Regimes,' ASME Journal of Tribology, Vol. 123, pp. 561-565 https://doi.org/10.1115/1.1308037
  4. Sheng, G., Liu, B. and Hua, W., 2000, 'A Nonlinear Dynamics Theory for Modeling Slider Air Bearing in Hard Disk Drives,' Journal of Applied Physics, Vol. 87, No. 9, pp. 6173-6175 https://doi.org/10.1063/1.372646
  5. Ono, K., Yamane, M. and Yamaura, H., 2005, 'Experimental and Analytical Study of Bouncing Vibrations of a Flying Head Slider in a Near-contact Regime,' ASME Journal of Tribology, Vol. 127, pp. 376-386 https://doi.org/10.1115/1.1843165
  6. Knigge, B. and Talke, F. E., 2001, 'Slider Vibration Analysis at Contact Using Time-frequency Analysis and Wavelet Transforms,' ASME Journal of Tribology, Vol. 123, pp. 548-554 https://doi.org/10.1115/1.1308035
  7. Thornton, B. H. and Bogy, D. B., 2003, 'Nonlinear Aspects of Air-bearing Modeling and Dynamic Spacing Modulation in Sub-5nm Air Bearings for Hard Disk Drives,' IEEE Transactions on Magnetics, Vol. 39, No. 2, pp. 722-728 https://doi.org/10.1109/TMAG.2003.809000
  8. Deoras, S. K. and Talke, F. E., 2004, 'Time-frequency Analysis of Slider Dynamics and the Effect of Lubricant,' ASME Journal of Tribology, Vol. 126, pp. 559-564 https://doi.org/10.1115/1.1695568
  9. Papandreou-Suppappola, A., 2003, Applications in Time-frequency Signal Processing, CRC Press
  10. Qian, S., 2002, Introduction to Time-frequency and Wavelet Transforms, Prentice Hall PTR