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TECHNICAL PAPERS

A Simplified 4-DOF Suspension Model for Dynamic Load/Unload Simulation and Its Application

[+] Author and Article Information
Q. H. Zeng, D. B. Bogy

Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 122(1), 274-279 (May 18, 1999) (6 pages) doi:10.1115/1.555354 History: Received February 05, 1999; Revised May 18, 1999
Copyright © 2000 by ASME
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References

Yamada,  T., and Bogy,  D. B., 1988, “Load-Unload Slider Dynamics in Magnetic Disk Drives,” IEEE Trans. Magn., 24, No. 6, pp. 2742–2744.
Jeong,  T. G., and Bogy,  D. B., 1992, “An Experimental Study of the Parameters that Determine Slider-Disk Contacts During Dynamic Load-Unload,” ASME J. Tribol., 114, No. 3, pp. 507–514.
Jeong,  T. G., and Bogy,  D. B., 1993a, “Dynamic Loading Impact Induced Demagnetization in Thin Film Media,” ASME J. Tribol., 115, No. 3, pp. 370–375.
Levi,  P. G., and Talke,  F. E., 1992, “Load/Unload Investigations on a Rotary Actuator Disk Drive,” IEEE Trans. Magn., 28, No. 5, pp. 2877–2879.
Fu,  T. C., and Bogy,  D. B., 1994, “Slider Vibrations induced by Ramp-Suspension Interaction During the Ramp Loading Process,” IEEE Trans. Magn., 30, No. 6, pp. 4170–4172.
Fu,  T. C., and Bogy,  D. B., 1995, “Slider-Disk Contacts During the Loading Process in a Ramp-Load Magnetic Disk Drive,” ASME Adv. Inform. Storate Systems, 6, pp. 41–54.
Fu,  T. C., and Bogy,  D. B., 1995, “Drive Level Slider-Suspension Vibration Analysis and its Application to a Ramp-Load Magnetic Disk Drive,” IEEE Trans. Magn., 31, No. 6, pp. 3003–3005.
Fu,  T. C., and Bogy,  D. B., 1996, “Readback Signal Decrease Due to Dynamic Load Head-Disk Contacts,” ASME J. Tribol., 118, pp. 370–375.
Suk,  M., and Gillis,  D., 1998, “Effect of Slider Burnish on Disk Damage During Dynamic Load/Unload,” ASME J. Tribol., 120, Apr. pp. 332–338.
Jeong,  T. G., and Bogy,  D. B., 1993, “Numerical Simulation of Dynamic Loading in Hard Disk Drives,” ASME J. Tribol., 115, No. 3, pp. 370–375.
Hu, Y., Jones, P. M., and Li, K., 1988, “Air Bearing Dynamics of Sub-Ambient Pressure Sliders During Dynamic Unload,” ASME/STLE, International Tribology Conference, Toronto, Canada, Oct. 25–28.
Peng, J. P., 1998, “Theoretical Prediction of Ramp Loading/Unloading Process in Hard Disk Drives,” ASME/STLE, International Tribology Conference, Toronto, Canada, Oct. 25–28.
Zeng,  Q. H., Chapin,  M., and Bogy,  D. B., 1999, “Dynamics of the Unload Process for Negative Pressure Sliders,” IEEE Trans. Magn., 35, No. 2, pp. 916–920.
Zeng,  Q. H., and Bogy,  D. B., 1999, “Slider Air Bearing Designs for Load/Unload Applications,” IEEE Trans. Magn., 35, No. 2, pp. 746–751.
Hu, Y., 1996, “Head-Disk-Suspension Dynamics,” Ph.D. dissertation, Department of Mechanical Engineering, University of California, Berkeley.
Cha, E., 1993, “Numerical Analysis of Head-Disk Assembly Dynamics for Shaped-Rail Sliders with Sub-Ambient Pressures Regions,” Ph.D. dissertation, Department of Mechanical Engineering, University of California, Berkeley.
Zeng,  Q. H., and Bogy,  D. B., 1999, “Stiffness and Damping Evaluation of Air Bearing Sliders and New Designs with High Damping,” ASME J. Tribol., 121, pp. 341–347.
Chapin, M., and Bogy, D. B., 2000, “Air Bearing Force Measurement of Pico Negative Pressure Sliders During Dynamic Unload,” ASME J. Tribol., (in press).
Chen, L. S., and Bogy, D. B., 1998, “Air Bearing Dynamic Simulator User Manual V4.21,” Technical Report No. 98-004, Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley.
Zeng,  Q. H., and Bogy,  D. B., 1998, “Dynamic Characteristics of a Suspension Assembly Part 1: Modal Experiment,” Adv. Inform. Storage Systems, 8, pp. 105–120.

Figures

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Schematic drawing of the suspension and slider
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Displacement at the L/UL tab and slider attitudes during the loading process
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Force histories during the loading process (Fs is almost coincident with Fa)
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Minimum clearance and pitch histories of the slider during the loading process calculated by the different suspension models (an initial disturbance is included in the pitch direction). (a) 4-DOF model. (b) 3-DOF model.
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Displacement at the L/UL point (tab) and slider attitudes during the loading process with a 1.0 degree PSA and initial disturbances (100 rad/s) in the pitch and roll directions
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Force histories during the unloading process
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Displacement at the L/UL tab and slider attitudes during the unloading process
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Effects of the disk rpm, unloading velocity and PSA on the lift-off forces

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