Linear stability analysis of finite porous journal bearings-Use of the Brinkman-extended Darcy model

Jaw Ren Lin, Chi-Chuan Hwang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

On the basis of the Brinkman-extended Darcy model (BEDM), this paper examines the effects of viscous shear stresses on the linear stability of finite porous journal bearings. The result shows that the influences of viscous shear stresses on the dynamic performance of porous journal-bearing systems are apparent and not negligible. In certain regions of parameter space the BEDM predicts quite different stability characteristics to those derived using either the slip-flow model (SFM) or Darcy model (DM). In particular, a higher threshold speed (increased stability) is predicted using the BEDM for porous bearings with (i) small length-to-diameter ratios (λ < 1) or (ii) low permeability parameters and high steady-state eccentricity ratios.

Original languageEnglish
Pages (from-to)645-658
Number of pages14
JournalInternational Journal of Mechanical Sciences
Volume36
Issue number7
DOIs
Publication statusPublished - 1994 Jan 1

Fingerprint

journal bearings
Linear stability analysis
Journal bearings
shear stress
Shear stress
Bearings (structural)
slip flow
eccentricity
permeability
thresholds

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "On the basis of the Brinkman-extended Darcy model (BEDM), this paper examines the effects of viscous shear stresses on the linear stability of finite porous journal bearings. The result shows that the influences of viscous shear stresses on the dynamic performance of porous journal-bearing systems are apparent and not negligible. In certain regions of parameter space the BEDM predicts quite different stability characteristics to those derived using either the slip-flow model (SFM) or Darcy model (DM). In particular, a higher threshold speed (increased stability) is predicted using the BEDM for porous bearings with (i) small length-to-diameter ratios (λ < 1) or (ii) low permeability parameters and high steady-state eccentricity ratios.",
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Linear stability analysis of finite porous journal bearings-Use of the Brinkman-extended Darcy model. / Lin, Jaw Ren; Hwang, Chi-Chuan.

In: International Journal of Mechanical Sciences, Vol. 36, No. 7, 01.01.1994, p. 645-658.

Research output: Contribution to journalArticle

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AB - On the basis of the Brinkman-extended Darcy model (BEDM), this paper examines the effects of viscous shear stresses on the linear stability of finite porous journal bearings. The result shows that the influences of viscous shear stresses on the dynamic performance of porous journal-bearing systems are apparent and not negligible. In certain regions of parameter space the BEDM predicts quite different stability characteristics to those derived using either the slip-flow model (SFM) or Darcy model (DM). In particular, a higher threshold speed (increased stability) is predicted using the BEDM for porous bearings with (i) small length-to-diameter ratios (λ < 1) or (ii) low permeability parameters and high steady-state eccentricity ratios.

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