PAFEC-EHL – Example Solution: Analysis of a Journal Bearing (smooth)

We take the particular case of a journal bearing shown below:

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Diameter	54 mm
Length	21.5 mm
Crank angular velocity	210 rad/s
Radial clearance	27 μm
Oil density	900 kg/m³
Viscosity	η = η₀ e^(0.013P)
η₀	6.98 mPas

Structural mesh of bearing housing

Fluid mesh of bearing film


	Pressure contour field in lubricant film: crank angle = 300^o


	Lubricant film thickness: crank angle = 300^o

Applied journal loads v Crank angle

A wide range of results are available for contouring and graphing, e.g. maximum pressure, minimum film thickness, journal power loss, journal eccentricities, etc.


Maximum oil film pressure v crank angle	Minimum oil film thickness v crank angle

Pressures calculated by the PAFEC-EHL analysis of the oil film may be saved and subsequently back-substituted into the PAFEC-FE analysis of the bearing housing. Plots and graphs of deformations and stresses may then be viewed.


Maximum principle stress for load step 55 in bearing housing elements adjacent to the oil film.	Deformation of housing elements adjacent to the oil film at load step 55.