ARMD™ 5.7

Module Description of BEARINGS (Fluid-Film Bearings)

The ARMD software package has the capabilities of evaluating both fluid-film and rolling-element bearings. Practically any bearing or bearing system available in the industry can be analyzed with one of the bearing solution modules.

The FLUID-FILM BEARING modules JURNBR, HYBCBR, TILTBR, and THRSBR solve the lubrication problem in two dimensions eliminating any approximation typically associated with one dimensional analysis or with look-up table methods.

Complete performance predictions of hydrodynamic, hydrostatic, and hybrid lubricated journal, conical and thrust bearings operating in the laminar and/or turbulent regime can be generated.

Simulation capabilities include such effects as misalignment, pressurized boundaries or grooves, cavitation, structural deformation, lubricant feed circuitry (JURNBR, HYBCBR) with specified pressures or restrictors (capillary, orifice, or flow control valve), groove geometry and chamfers.

The results include:

• Load capacity / journal position
• Attitude angle
• Viscous power loss
• Righting moments
• Flow requirements
• Stability (bearing whirl)
• Spring and damping coefficients
• Clearance and pressure distribution

The FLUID-FILM BEARING modules incorporate numerous templates for common bearings used in industry. In addition, bearing configurations that can be evaluated with the various solution modules include but not limited to:

Cylindrical & Conical Fixed Geometry (JURNBR & HYBCBR)

• Plain
• Multi-groove
• Tapered land or pocket
• Rayleigh step or pocket
• Pressure dam
• Elliptical or lemon
• Lobe or canted lobe
• Multi-recess

Cylindrical Tilting-Pad Geometry (TILTBR)

• Tilting pad with user specified:
  - Pivot location
  - Preload

Thrust Fixed and Tilting-Pad Geometries (THRSBR)

• Plain
• Multi-groove
• Tapered land
• Tapered pocket
• Step land
• Step pocket
• Tilting pad
• Compound taper

Examples:

4-Canted Lobe Journal Bearing Pressure Distribution
for Concentric Operation @ 6000 rpm

90 Inch Diameter Hybrid Trunnion Bearing
for Coal Pulverizer Operating @ 12 rpm

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