Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions

M. H. Lee, J. H. Lee, K. B. Kim, Gunhee Jang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We proposed a method to predict the heights of upper and lower air-oil interfaces of the fluid dynamic bearings (FDBs) in the tied shaft of hard disk drives (HDDs) during non-operating condition. We formulated a pressure equation according to capillary pressure, atmospheric pressure, hydrostatic pressure and applied pressure, and a volume equation according to the volumes of the clearance and the injected oil. We solved the linear equations of pressure equation and volume equation simultaneously to calculate the heights of upper and lower air-oil interfaces. Finally, we verified the proposed method by measuring the height of upper air-oil interface. Height of upper air-oil interface increases with the increase of pressure difference because pressure of lower air-oil interface is higher than that of upper air-oil interface. Since the volume of injected oil is constant, height of lower air-oil interface decrease with the increase of pressure difference.

Original languageEnglish
Title of host publicationASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791858103
DOIs
StatePublished - 2017 Jan 1
EventASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017 - San Francisco, United States
Duration: 2017 Aug 292017 Aug 30

Other

OtherASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017
CountryUnited States
CitySan Francisco
Period17/08/2917/08/30

Fingerprint

Bearings (structural)
Hard disk storage
Fluid dynamics
Air
Oils
Capillarity
Hydrostatic pressure
Linear equations
Atmospheric pressure

Cite this

Lee, M. H., Lee, J. H., Kim, K. B., & Jang, G. (2017). Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions. In ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017 American Society of Mechanical Engineers. https://doi.org/10.1115/ISPS2017-5427
Lee, M. H. ; Lee, J. H. ; Kim, K. B. ; Jang, Gunhee. / Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions. ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017. American Society of Mechanical Engineers, 2017.
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abstract = "We proposed a method to predict the heights of upper and lower air-oil interfaces of the fluid dynamic bearings (FDBs) in the tied shaft of hard disk drives (HDDs) during non-operating condition. We formulated a pressure equation according to capillary pressure, atmospheric pressure, hydrostatic pressure and applied pressure, and a volume equation according to the volumes of the clearance and the injected oil. We solved the linear equations of pressure equation and volume equation simultaneously to calculate the heights of upper and lower air-oil interfaces. Finally, we verified the proposed method by measuring the height of upper air-oil interface. Height of upper air-oil interface increases with the increase of pressure difference because pressure of lower air-oil interface is higher than that of upper air-oil interface. Since the volume of injected oil is constant, height of lower air-oil interface decrease with the increase of pressure difference.",
author = "Lee, {M. H.} and Lee, {J. H.} and Kim, {K. B.} and Gunhee Jang",
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Lee, MH, Lee, JH, Kim, KB & Jang, G 2017, Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions. in ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017. American Society of Mechanical Engineers, ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017, San Francisco, United States, 17/08/29. https://doi.org/10.1115/ISPS2017-5427

Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions. / Lee, M. H.; Lee, J. H.; Kim, K. B.; Jang, Gunhee.

ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017. American Society of Mechanical Engineers, 2017.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - We proposed a method to predict the heights of upper and lower air-oil interfaces of the fluid dynamic bearings (FDBs) in the tied shaft of hard disk drives (HDDs) during non-operating condition. We formulated a pressure equation according to capillary pressure, atmospheric pressure, hydrostatic pressure and applied pressure, and a volume equation according to the volumes of the clearance and the injected oil. We solved the linear equations of pressure equation and volume equation simultaneously to calculate the heights of upper and lower air-oil interfaces. Finally, we verified the proposed method by measuring the height of upper air-oil interface. Height of upper air-oil interface increases with the increase of pressure difference because pressure of lower air-oil interface is higher than that of upper air-oil interface. Since the volume of injected oil is constant, height of lower air-oil interface decrease with the increase of pressure difference.

AB - We proposed a method to predict the heights of upper and lower air-oil interfaces of the fluid dynamic bearings (FDBs) in the tied shaft of hard disk drives (HDDs) during non-operating condition. We formulated a pressure equation according to capillary pressure, atmospheric pressure, hydrostatic pressure and applied pressure, and a volume equation according to the volumes of the clearance and the injected oil. We solved the linear equations of pressure equation and volume equation simultaneously to calculate the heights of upper and lower air-oil interfaces. Finally, we verified the proposed method by measuring the height of upper air-oil interface. Height of upper air-oil interface increases with the increase of pressure difference because pressure of lower air-oil interface is higher than that of upper air-oil interface. Since the volume of injected oil is constant, height of lower air-oil interface decrease with the increase of pressure difference.

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Lee MH, Lee JH, Kim KB, Jang G. Prediction and experimental verification of the heights of air-oil interfaces in the FDBs in a tied shaft of HDDs during non-operating conditions. In ASME 2017 Conference on Information Storage and Processing Systems, ISPS 2017. American Society of Mechanical Engineers. 2017 https://doi.org/10.1115/ISPS2017-5427