Bifurcation Analysis of the Load/Unload Systems With Multiple Flying Height States

[+] Author and Article Information
Pyung Hwang

School of Mechanical Engineering, Yeungnam University, 214-1, Dae-dong, Gyongsan, Gyongbuk, 712-749, Koreaphwang@ynu.ac.kr

Polina V. Khan

School of Mechanical Engineering, Yeungnam University, 214-1, Dae-dong, Gyongsan, Gyongbuk, 712-749, Koreapolina@ynu.ac.kr

J. Tribol 128(3), 665-669 (Mar 22, 2006) (5 pages) doi:10.1115/1.2197852 History: Received May 03, 2005; Revised March 22, 2006

The load/unload behavior of the hard disk drive slider is studied in terms of the air bearing static characteristics. The application of numerical continuation methods to calculate spacing diagrams is proposed. The algorithm that detects multiple flying height states and fold points is developed. The relationship between suspension force x-offset and critical preload is found for femto size sliders. The second fold corresponding to the critical preload for unloading is found in the negative air bearing force area. The range of x-offsets and preloads where bi-stable phenomenon exists is depicted on the stability diagram. The perturbation method is used to check the dynamic system characteristic values near the fold points and to determine the stability of the solution branches. The present procedure can be employed to study the multiple flying height states in the terms of any other pair of parameters besides the preload and x-offset.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Air-bearing surface of the femto slider. 1—2500nm recess level. 2—300nm recess level. 3—zero recess level.

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Figure 2

Spacing diagram. Solid lines—stable branches, dashed lines—unstable branches. Numbers refer to xs, disks denote folds, and crosses denote slider-disk contact. (a) HFHS; (b) NFHS, positive preload; and (c) NFHS, negative preload.

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Figure 3

Spacing evolution during loading for xs=0.1346

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Figure 4

Spacing evolution during unloading for xs=0.0203

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Figure 5

Stability diagram. Solid lines—fold curves, dashed lines—other boundaries.




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