Calculating rotordynamic coefficients of a ferrofluid-lubricated and herringbone-grooved journal bearing via finite difference analysis

Paul C.-P. Chao*, J. S. Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The objective of this study to explore the rotordynamic characteristics of a hydrodynamic grooved journal bearing (HGJB) filled with ferrofluid lubricant via finite element analysis. Small-sized HGJBs nowadays serve well as the candidates for supporting high-speed rotating spindles of data-storage drives; such as hard disc drives and optical disc drives. The analysis herein on HGJBs is expected to distill design guidelines with main goals of reaching higher stiffnesses and simultaneously owns largest stability margin. To fulfill the aforementioned goal, the present study starts with building the mass flux equations of the HGJBs filled with ferrofluid, which is followed by discretization over the bearing clearance domain and derivation of finite difference equations based on mass flow balance. Finally, the pressure distribution of fluid film, stiffnesses, damping coefficients, and critical mass are computed. Results show the usage of the ferrofluid owns the capability to alter and improve the general dynamic characteristics of a hydrodynamic grooved journal bearing.

Original languageEnglish
Pages (from-to)101-110
Number of pages10
JournalTribology Letters
Volume19
Issue number2
DOIs
StatePublished - 1 Jun 2005

Keywords

  • Ferrofluid
  • Finite difference analysis
  • Grooves
  • Journal bearing

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