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Parameter
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Type
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Description
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|---|---|---|
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Design B10 Life
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Real. Used in Lambda b calculation.
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The design B10 life for the bearing. This value is used to calculate the base failure rate of the bearing. The B10 life of a bearing is generally provided by the manufacturer. If it is not provided, it can be calculated using the following equation, providing that the design MTBF of the bearing is known:
L10 = N0.09 * MTBF / 5.45
Where:
• L10 = The B10 life of the bearing.
• N = The number of bearings.
• MTBF = The design MTBF of the bearing.
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Actual Radial Load
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Real (lbs). Used in Cy calculation.
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Can be computed from various equations depending on the bearing type and number of bearings, load factors, diameters, and more. See Tables 7-2 through 7-4 in the Handbook of Reliability Prediction Procedures for Mechanical Equipment.
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Rated Radial Load
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Real (lbs). Used in Cy calculation.
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The specification radial load in lbs.
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Actual Viscosity (xE-8)
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Real (Lb-Min/Sq In * E-8). Used in Cv calculation.
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The operating viscosity of the lubricating fluid. Entered values are multiplied by 1E-8 to obtain actual viscosity. Fluid viscosity changes with temperature. For more information, see Viscosity.
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Spec Viscosity (xE-8)
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Real (Lb-Min/Sq In * E-8). Used in Cv calculation.
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The specified viscosity of the lubricating fluid. Entered values are multiplied by 1E-8 to obtain actual viscosity. The options here are the same as for the field above.
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% of Water in Oil
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Real. Used in Ccw calculation.
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The percentage of water in oil, which accounts for the reduction in fatigue life due to leakage of water into the oil lubrication.
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Bearing Type
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Choice List. Used in Cy calculation.
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The type of bearing. Choices are:
• Ball
• Roller
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Cycles/Hour
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Real
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The number of revolutions or cycles/hour. This is required to convert failure ratings from failures/cycle or revolution to failures/hour.
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[Derating Parameters]
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For more information, see Derating Parameters.
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