FINITE ELEMENT MODELING OF THE EFFECT OF WEAR ON THE LOAD-CARRYING CAPACITY AND MAXIMUM OIL PRESSURE...
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Transcript of FINITE ELEMENT MODELING OF THE EFFECT OF WEAR ON THE LOAD-CARRYING CAPACITY AND MAXIMUM OIL PRESSURE...
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FINITE ELEMENT MODELING OF THE EFFECT OF WEAR ON THE LOAD-CARRYING
CAPACITY AND MAXIMUM OIL PRESSURE OF A PLAIN JOURNAL BEARING
Marc Desjardins and Ernesto Gutierrez-Miravete
Rensselaer at Hartford
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Wear in Journal Bearings
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Steady Laminar Flow of a Newtonian Fluid: Governing Equations
∂vx/∂x + ∂vy/∂y + ∂vz/∂z = 0
v · v∇ x = − ∂p/∂x + µ∇2 vx + ρgx
v · v∇ y = − ∂p/∂y + µ∇2 vy + ρgy
v · v∇ z = − ∂p/∂z + µ∇2 vz + ρgz
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Sommerfeld Hydrodynamic Lubrication Journal Bearing Model
p – p0 =
W/L =
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Characteristics of Journal Bearings Studied
• Sleeve radius rs (mm) = 100 • Journal (shaft) radius r (mm) = 98 • Offset in the x-direction (mm) = 1.0 • Eccentricity e (mm) = 1.0 • Radial clearance c (mm) = 2.0 • Eccentricity ratio ε = e/c = 0.5 • Rotation Speed N (rpm) = 60 - 130• Temperature (oF) = 50 – 150 • Viscosity μ (Pa s) = 0.3• Density ρ (kg/m3) = 900
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Finite element Model Validation: Baseline Journal Bearing
p – p0 (Sommerfeld Solution) = 6473 Pap – p0 (Finite Element Solution) = 6500 Pa
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Modeling Journal Bearing Wear Smearing and Flaking Scars
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Computed Pressure versus Smearing Wear Scar Location (90 o vs 150 o)
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Peak Pressure Locations
First Pressure Peak
Second Pressure Peak
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Maximum Pressure vs Smearing Wear Scar Location
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Load Carrying Capacity vs Smearing Wear Scar Location
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Conclusions• The amount of influence a single wear site can have
on a plain journal bearing depends on its location relative to the maximum pressure location of the same journal bearing without wear.
• The wear location site relative to the maximum pressure location of the bearing without wear (φ = 132°) seems to be an important parameter affecting the bearing’s performance.
• Wear sites downstream of this maximum pressure location cause an abrupt and severe decrease in load-carrying capacity.