Surface Topology Optimization of Air Bearing Slider for Wear Durability in Magnetic Hard Disk Drives

Abstract:

In order to protect the slider and disk from excessive wear, a numerical scheme is proposed for transient dynamics at slider/disk interface with the emphasis on the slider wear mechanism and the surface topology optimization of sub-ambient pressure slider. For each transient flying height and slider attitude, the modified Reynolds lubrication equation is solved by the control volume method to obtain the simultaneous pressure distribution in the slider surface. Then the dynamic flying attitude of the slider subject to the calculated pressure distribution can be solved by the Quasi-Newton iteration method at each time step. On the basis of above work, the optimization of the slider surface topology is implemented, and it’s concluded that slider crown has the most significant impact on the dynamic flying attitude and stability. Finally, a sub-ambient pressure slider is designed, which can effectively avoid the slider wear and severe fault of hard disk drive.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 959-964
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.959
• Online since: December 2011
• Authors: Da Wei Zhao, Yan Yang Zi, Zheng Jia He
• Keywords: Control Volume Method, Surface Topology Optimization, Transient Dynamics, Wear Mechanism

References

[1] Ruiz and D.B. Bogy, A Numerical Simulation of the Head-Disk Assembly in Magnetic Hard Disk Files: Part Ⅰ－Component Models, Journal of Tribology, Vol. 112, No. 4, 1990, pp.593-602.

DOI: 10.1115/1.2920303

[2] M. Anaya-Dufreshne, On the Development of a Reynolds Equation for Air Bearings with Contact, Carnegie Mellon University, Pittsburgh, PA, 1996.

[3] K. Iida, K. Ono and M. Yamane, Dynamic Characteristics and Design Consideration of a Tripad Slider in the Near-Contact Regime, Journal of Tribology, Vol. 124, No. 3, 2002, pp.600-606.

DOI: 10.1115/1.1467089

[4] V. Gupta and D.B. Bogy, Effect of Intermolecular Forces on the Static and Dynamic Performance of Air Bearing Silders: Part Ⅱ－Dependence of the Stability on Hamaker Constant, Suspension Preload and Pitch Angle, Journal of Tribology, Vol. 128, No. 1, 2006, pp.203-208.

DOI: 10.1115/1.2000270

[5] W. Huang, D.B. Bogy and M. Honchi, An Asperity Contact Model for the Silder Air bearing, Journal of Tribology, Vol. 122, No. 2, 2000, pp.436-443.

DOI: 10.1115/1.555379

[6] L. Wu, Physical modeling and numerical simulations of the slider air bearing problem of hard, University of California, Berkely, CA, 2001.

[7] S.J. Yoon and D.H. Choi, Topology Design of Slider Air Bearings, Journal of Tribology, Vol. 126, No. 2, 2004, pp.342-346.

DOI: 10.1115/1.1611501

[8] B.H. Thornton and D.B. Bogy, A Numerical Study of Air-Bearing Slider Form-Factors, Journal of Tribology, Vol. 126, No. 3, 2004, pp.553-558.

DOI: 10.1115/1.1691435