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Lubrication and Wear

1 tool in the Mechanical Design area.

Journal Bearing and Wear

Hydrodynamic analysis of a full plain journal bearing by a finite-difference solution of the Reynolds equation on the unwrapped oil film, with the Reynolds (Swift-Stieber) or the half-Sommerfeld cavitation boundary: eccentricity ratio for the entered load (or load for an entered eccentricity), attitude angle, minimum film thickness, pressure distribution and peak pressure, friction force, torque, power and coefficient, side and inlet oil flow, and the lubricant temperature rise by an energy balance iterated with a two-point ASTM D341 viscosity-temperature relation. Beside the numerical solution the page prints Petroff's no-load friction, the short-bearing closed forms of NACA Report 1157 (DuBois and Ocvirk) and the infinitely long half-Sommerfeld solution at the same Sommerfeld number, a mesh-convergence table, design charts of eccentricity, friction, flow and temperature-rise variables against the Sommerfeld number for the entered length-diameter ratio (what the Raimondi-Boyd charts tabulate), and an Archard sliding-wear estimate with the PV product. Default: a 2-in journal, 0.001-in radial clearance, 1-in length, 1,800 rpm, 500 lb, 4 microreyn oil at 110 F inlet, with the oil of NACA TN 3491 as the two-point example.

1 worked example reproduced, listed on the tool page.

Other Mechanical Design sections

Shafts · Gears · Bearings · Springs · Fasteners and Power Screws · Pressure Vessels · Tolerances · Mass Properties · Vibration · Acoustics · Brakes, Clutches and Belts · Machining and Manufacturing