On the linear stability analysis of journal bearings – Consideration of coupled effects of anisotropic slip and surface roughness

Wang-Long Li, Zhen Hua Huang, Ching Shan Lin, Tzu Hsiang Chen, Shiuh Hwa Shyu

Research output: Contribution to journalArticle

Abstract

An average modified Reynolds equation (AMRE), considering the coupled effects of anisotropic slip and roughness, is linearized at the operation point to obtain the static and dynamic AMREs. The bearing is modelled as a spring-damper with the dynamic coefficients. The stability analysis of the rigid rotor/bearing system showed that slip length B has negative effects on load capacity W and critical mass Mcr. Slenderness ratio progressively strengthens the negative effects of B on Mcr for circumferential-slip, yet weakens those negative effects for axial-slip. For short and square bearings, W and Mcr for Peklenik number γ = 9 are greater than those for γ = 1, followed by γ = 1/9; for long bearings, W and Mcr for γ = 1/9 are greater than those for γ = 1, followed by γ = 9.

Original languageEnglish
Pages (from-to)254-266
Number of pages13
JournalTribology International
Volume137
DOIs
Publication statusPublished - 2019 Sep 1

Fingerprint

Bearings (structural)
journal bearings
Linear stability analysis
Journal bearings
surface roughness
slip
roughness
Surface roughness
Rigid rotors
critical mass
Reynolds equation
rigid rotors
dampers
aspect ratio
coefficients

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Li, Wang-Long ; Huang, Zhen Hua ; Lin, Ching Shan ; Chen, Tzu Hsiang ; Shyu, Shiuh Hwa. / On the linear stability analysis of journal bearings – Consideration of coupled effects of anisotropic slip and surface roughness. In: Tribology International. 2019 ; Vol. 137. pp. 254-266.
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On the linear stability analysis of journal bearings – Consideration of coupled effects of anisotropic slip and surface roughness. / Li, Wang-Long; Huang, Zhen Hua; Lin, Ching Shan; Chen, Tzu Hsiang; Shyu, Shiuh Hwa.

In: Tribology International, Vol. 137, 01.09.2019, p. 254-266.

Research output: Contribution to journalArticle

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AB - An average modified Reynolds equation (AMRE), considering the coupled effects of anisotropic slip and roughness, is linearized at the operation point to obtain the static and dynamic AMREs. The bearing is modelled as a spring-damper with the dynamic coefficients. The stability analysis of the rigid rotor/bearing system showed that slip length B has negative effects on load capacity W and critical mass Mcr. Slenderness ratio progressively strengthens the negative effects of B on Mcr for circumferential-slip, yet weakens those negative effects for axial-slip. For short and square bearings, W and Mcr for Peklenik number γ = 9 are greater than those for γ = 1, followed by γ = 1/9; for long bearings, W and Mcr for γ = 1/9 are greater than those for γ = 1, followed by γ = 9.

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