This study presents the dynamic motion of a ball bearing cage submerged in a cryogenic fluid under high-speed conditions. The dynamic motion of the cage has been studied as a function of the race land-cage and ball-cage pocket clearances for different inner race rotation speeds under light load conditions. In addition, this study conducted computational fluid dynamics (CFD) analysis using commercial software to analyze the fluid dynamic forces on the cage. The hydraulic force obtained from the CFD analysis was coded in commercial ball bearing analysis software as a function of the eccentricity ratio and rotation speed of the cage. Finally, the dynamic motion of the ball bearing cage considering the effects of fluid dynamic forces has been studied. The results include the cage whirling amplitude, fluctuation of cage whirling speed, and cage wear for various cage clearances and rotation speeds. The cage whirling amplitude decreases as the outer guidance clearance decreases, and it decreases as the rotation speed increases up to 11,000 rpm because of the increasing hydrodynamic force of the liquid nitrogen (LN2). However, the probability density function curves indicate that an increase in the rotor speed increases the standard deviation in the cage whirling frequency. The wear loss of the cage was greatest for the largest race land-cage and the smallest ball-cage pocket clearances. Consequently, the analysis results for various operating conditions (inner race rotation speeds, cage clearances, traction coefficients, etc.) are in good agreement with the reference results.
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April 2018
Research-Article
Numerical Study of Cage Dynamics Focused on Hydrodynamic Effects of Guidance Land Clearances for Different Ball-Pocket Clearances in Cryogenic Environments
Bokseong Choe,
Bokseong Choe
Center of Urban Energy System Research,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: bschoe@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: bschoe@kist.re.kr
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Jeonkook Lee,
Jeonkook Lee
Center for Opto-Electronic Materials and Devices,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: jkleemc@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: jkleemc@kist.re.kr
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Doyoung Jeon,
Doyoung Jeon
Professor
Department of Mechanical Engineering,
Sogang University,
Mapo-gu,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Department of Mechanical Engineering,
Sogang University,
Mapo-gu,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
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Yongbok Lee
Yongbok Lee
Center of Urban Energy System Research,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Search for other works by this author on:
Bokseong Choe
Center of Urban Energy System Research,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: bschoe@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: bschoe@kist.re.kr
Jeonkook Lee
Center for Opto-Electronic Materials and Devices,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: jkleemc@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: jkleemc@kist.re.kr
Doyoung Jeon
Professor
Department of Mechanical Engineering,
Sogang University,
Mapo-gu,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Department of Mechanical Engineering,
Sogang University,
Mapo-gu,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Yongbok Lee
Center of Urban Energy System Research,
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Korea Institute of Science and Technology,
Seongbuk-gu,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 10, 2017; final manuscript received July 20, 2017; published online November 7, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Apr 2018, 140(4): 042502 (11 pages)
Published Online: November 7, 2017
Article history
Received:
July 10, 2017
Revised:
July 20, 2017
Citation
Choe, B., Lee, J., Jeon, D., and Lee, Y. (November 7, 2017). "Numerical Study of Cage Dynamics Focused on Hydrodynamic Effects of Guidance Land Clearances for Different Ball-Pocket Clearances in Cryogenic Environments." ASME. J. Eng. Gas Turbines Power. April 2018; 140(4): 042502. https://doi.org/10.1115/1.4037872
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