Nonlinear study of a misaligned hydrodynamic journal bearing
- Akron Univ., OH (United States)
Hydrodynamic/hydrostatic journal bearings have been widely used in various types of high speed rotating machinery. For space applications, the issue of using cryogenic fluids as working lubricants has steadily gained in significance. The main objective of this paper is to study the nonlinear effects in a hydrodynamic journal bearing with special attention to the effects of journal axial misalignment. The numerical model that couples the Reynolds equation with the dynamics of the rotor is solved by means of a finite difference solution technique. Fluid film pressures that resulted from an iterative scheme are integrated to generate bearing supporting forces. A two-dimensional Newton-Raphson iteration method is used to locate the journal equilibrium position from which both linear and nonlinear bearing stiffness are evaluated by means of the small perturbation technique. The effects of axial misalignment on bearing equilibrium position, lubricant fluid film thickness, pressure distribution, and stiffness characteristics are examined. General conclusions are drawn from the parametric studies in load, speed, inlet temperature, and axial misalignment. 24 refs.
- OSTI ID:
- 5882956
- Journal Information:
- Tribology Transactions; (United States), Journal Name: Tribology Transactions; (United States) Vol. 36:3; ISSN 1040-2004; ISSN TRTRE4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
BEARINGS
CALCULATION METHODS
COMPUTERIZED SIMULATION
CRYOGENIC FLUIDS
FILM FLOW
FILMS
FINITE DIFFERENCE METHOD
FLUID FLOW
FLUIDS
ITERATIVE METHODS
JOURNAL BEARINGS
LUBRICANTS
NEWTON METHOD
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
SIMULATION
THIN FILMS