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

Jaw Ren Lin; Chi Chuan Hwang

doi:10.1016/0020-7403(94)90019-1

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

Jaw Ren Lin, Chi Chuan Hwang

Department of Engineering Science

Research output: Contribution to journal › Article › peer-review

6 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 language	English
Pages (from-to)	645-658
Number of pages	14
Journal	International Journal of Mechanical Sciences
Volume	36
Issue number	7
DOIs	https://doi.org/10.1016/0020-7403(94)90019-1
Publication status	Published - 1994 Jul

All Science Journal Classification (ASJC) codes

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

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10.1016/0020-7403(94)90019-1

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title = "Linear stability analysis of finite porous journal bearings-Use of the Brinkman-extended Darcy model",

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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N2 - 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.

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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