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Experimental Stability Study on Herringbone-Microgrooved Journal Bearing in an Impeller-Spindle

Published online by Cambridge University Press:  22 March 2012

B.-H. Chang ,
P.-H. Chen  and
D.-S. Lee
B.-H. Chang*
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
P.-H. Chen
Affiliation:
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
D.-S. Lee
Affiliation:
Department of Energy and Refrigerating Air Conditioning Engineering, National Taipei University of Technology, Taipei, Taiwan 10617, R.O.C.
*
*Corresponding author ([email protected])
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Abstract

The reliability of the impeller-spindle with respect to the effects of abnormal vibrations and noises is relative to the whirl rotation in notebook (NB) computers, all-in-one (AIO) desktop systems, and tablet PCs. This study experimentally investigates the stability of a herringbone-microgrooved journal bearing in an impeller-spindle under static radial forces.The experimental device operated at 2700, 3600, 4200, and 4900rpm, with a static load ranging from 0.4, 0.8, and 1.6N. The experiment obtained the stiffness and damping coefficients, and the study involved analyzing the stability. Results show that the dimensionless threshold speed of rotation decreased as the Sommerfeld number increased. The proposed impeller-spindle is stable when the Sommerfeld number is less than 59, indicating that the impeller-spindle should not operate at an eccentricity ratio below 0.18.

Keywords

Herringbone-microgrooved journal bearingImpeller-spindleStabilityDimensionless threshold speed of rotation
Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 1 , March 2012 , pp. 123 - 133
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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