Forced Response of PZT Glide Heads

[+] Author and Article Information
Jin-Hui Ou-Yang

Mechanical Engineer, Western Digital Corporation, San Jose, CA 95138

Alex Y. Tsay

Castlewood System Inc., Milpitas, CA 95035

I. Y. Shen

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600

C.-P. Roger Ku

Western Digital Corporation, San Jose, CA 95138

David Kuo

Seagate Recording Media, Fremont, CA 94538

J. Tribol 122(4), 780-786 (Mar 30, 2000) (7 pages) doi:10.1115/1.1310161 History: Received January 12, 1999; Revised March 30, 2000
Copyright © 2000 by ASME
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Yeack-Scranton,  C. E., 1986, “Novel Piezoelectric Transducers to Monitor Head-Disk Interactions,” IEEE Trans. Magn., 22, No. 5, pp. 1011–1016.
Tsay,  A. Y., Ou-Yang,  J. H., Ku,  C.-P. Roger, Shen,  I. Y., and Kuo,  D., 1999, “Free Vibration Analysis of PZT Glide Heads,” ASME J. Tribol., 121, No. 4, pp. 984–988.
Mochizuki,  K., Sato,  L., and Hayashi,  T., 1988, “Impulse Force Detection of Head Disk Media Contact Using a Small Piezoelectric Transducer,” Trans. Inst. Electron., Inf. Commun. Eng., Sect. E, E71, No. 4, p. 360.
Hamaguchi,  T., and Matsumoto,  M., 1990, “Measurement of Impulsive Forces Arising from Flying Head/Disk Collision in Magnetic Disk Storage Systems,” JSME Int. J., Ser. III, 33, No. 1, pp. 29–34.
Yahashi,  T., Ohkubo,  T., Mochizuki,  K., and Sato,  I., 1991, “Contact Detection and Evaluation of the Dynamic Characteristics of a Flying Head Slider for Magnetic Disk Storage Using a Piezoelectric Transducer,” JSME Int. J., Ser. III, 34, No. 4, pp 496–502.
Matsumoto,  M., Iida,  A., and Hamaguchi,  T., 1993, “Measurement of Slider/Disk Collision Forces Using Acoustic Emission Source Wave Analysis,” STLE Tribol. Trans., 36, No. 4, pp. 736–740.
Tsay, A. Y., 1998, “Theoretical and Experimental Analysis of Vibration Characteristics of Glide Heads for Computer Hard Disk Drives,” Master thesis, University of Washington, Seattle, WA.


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Geometry of a PZT glide head
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Experimental setup of LDV experiment
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Frequency response function of an LDV measurement at the inner rail: (a) 1.2-MHz bandwidth and (b) 4-kHz bandwidth.
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Impedance measurement of a PZT glide head
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Locations at which resonance amplitudes are calculated in FEA
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Experimental setup of mechanical impact
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Velocity of miniature balls with respect to distance
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(a) Experimental setup to measure impact duration, (b) typical response from PVDF, and (c) a simplified mechanical model
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A sample of reconstructed FRF with T=3 μs
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Frequency response function from FEA and experimental results



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