Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force

Joo Young Yoon, No Cheol Park, Gunyeop Lim, Sang Jeong Lee, Kyoung Su Park

Research output: Contribution to conferencePaper

Abstract

In the history of hard disk drive there are steadily increasing magnetic recording density. The head-positioning control should be more high accuracy because of the high magnetic density in hard disk drive. Previous studies of head-positioning control are considered pivot friction torque or dual actuator control system. These are not considered structural characteristics of pivot ball bearing. A nonlinear dynamic model of a pivot ball bearing is presented in this paper, considering contact between balls and an outer race when slider is seeking. The Hertzian contact equation is used at the contact points. The pivot ball bearing differs from other ball bearings in that it is combined an actuator and rotates at seeking velocity profile. Therefore, the modeling is considered a change of the center of mass and also seeking velocity. It is hard to measure directly displacement and velocity of the outer race by using laser-Doppler vibrometers because of actuator. Therefore, measurement location is replaced by a small cylinder which is adhered above the outer race to measure. To verify a new pivot ball bearing model, this paper makes a comparison between the modeling and this result which is compensated for motion of the cylinder at several seeking distance.

Original languageEnglish
Publication statusPublished - 2015 Jan 1
Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States
Duration: 2015 Aug 92015 Aug 12

Other

Other44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
CountryUnited States
CitySan Francisco
Period15/8/915/8/12

Fingerprint

pivots
ball bearings
dynamic models
actuators
positioning
vibration meters
magnetic recording
chutes
center of mass
torque
balls
friction
velocity distribution
histories
lasers

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Yoon, J. Y., Park, N. C., Lim, G., Lee, S. J., & Park, K. S. (2015). Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.
Yoon, Joo Young ; Park, No Cheol ; Lim, Gunyeop ; Lee, Sang Jeong ; Park, Kyoung Su. / Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.
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Yoon, JY, Park, NC, Lim, G, Lee, SJ & Park, KS 2015, 'Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force', Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States, 15/8/9 - 15/8/12.

Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force. / Yoon, Joo Young; Park, No Cheol; Lim, Gunyeop; Lee, Sang Jeong; Park, Kyoung Su.

2015. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.

Research output: Contribution to conferencePaper

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N2 - In the history of hard disk drive there are steadily increasing magnetic recording density. The head-positioning control should be more high accuracy because of the high magnetic density in hard disk drive. Previous studies of head-positioning control are considered pivot friction torque or dual actuator control system. These are not considered structural characteristics of pivot ball bearing. A nonlinear dynamic model of a pivot ball bearing is presented in this paper, considering contact between balls and an outer race when slider is seeking. The Hertzian contact equation is used at the contact points. The pivot ball bearing differs from other ball bearings in that it is combined an actuator and rotates at seeking velocity profile. Therefore, the modeling is considered a change of the center of mass and also seeking velocity. It is hard to measure directly displacement and velocity of the outer race by using laser-Doppler vibrometers because of actuator. Therefore, measurement location is replaced by a small cylinder which is adhered above the outer race to measure. To verify a new pivot ball bearing model, this paper makes a comparison between the modeling and this result which is compensated for motion of the cylinder at several seeking distance.

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Yoon JY, Park NC, Lim G, Lee SJ, Park KS. Nonlinear dynamic model of a pivot ball bearing in hard disk derive including the Hertzian contact force. 2015. Paper presented at 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015, San Francisco, United States.