This paper describes optimum air-bearing design of a tri-pad slider in terms of tracking ability to micro-waviness based on theoretical analysis of the two-degree-of-freedom slider model and the distributed and concentrated air-bearing stiffness model. Although a short tri-pad type slider was introduced through the load/unload technique, we point out that this type of slider is superior to the traditional rail type slider in terms of tracking ability to micro-waviness. More importantly, the distance between head-gap position and the rear air-bearing center should be made as small as possible. The spacing variation due to lower mode resonance can be eliminated if the positions of front and rear air-bearing centers are located at the center of percussion. The resonance amplitude of the higher order mode in spacing variation can be reduced if the length of the rear air-bearing pad is designed to be times the wavelength of the higher mode resonance frequency. Since the momental stiffness of the front air-bearing prevents the head-gap from tracking micro-waviness, the front air-bearing length should be made short or the ratio of rear to front air-bearing stiffness should be made large. If the resonance amplitude of the lower mode must be decreased, the front air-bearing length should be designed to be times the wavelength of the lower mode resonance frequency.
Analysis of Tracking Characteristics and Optimum Design of Tri-Pad Slider to Micro-Waviness
Contributed by the Tribology Division of the THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the ASME/STLE Tribology Conference, Cancun, Mexico October 27–30, 2002. Manuscript received by the Tribology Division March 5, 2002; revised manuscript received June 28, 2002. Associate Editor: C.-P. R. Ku.
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Yamane , M., Ono, K., and Iida, K. (December 31, 2002). "Analysis of Tracking Characteristics and Optimum Design of Tri-Pad Slider to Micro-Waviness ." ASME. J. Tribol. January 2003; 125(1): 152–161. https://doi.org/10.1115/1.1510882
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