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Parameter
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Type
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Description
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|---|---|---|
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Base Failure Rate
|
Real (Failures/Million Cycles). Used in Lambda b calculation
|
The base or manufacturer-supplied failure rate. Generally, this field is left at #.# so that the failure rate is calculated based on the values entered for other parameters. If you enter a value for this parameter, this value is used in place of a calculated failure rate.
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|
Wear Factor
|
Real. Used in Lambda b calculation
|
The wear factor is equal to 0.2 for materials that have a high susceptibility to adhesive wear. The wear process involves a transfer to material from one surface to the other.
The wear factor is equal to 0.54 for materials that have little tendency to transfer material, The material is subject to micro-gouging of the surfaces by the asperities on the material surface.
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|
Yield Strength
|
Real (psi). Used in Lambda b calculation
|
The yield strength of softer material in psi.
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|
Transverse Load
|
Real (lbs). Used in Lambda b calculation
|
The traverse or side load on the actuator in pounds.
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|
Piston Length
|
Real (in). Used in Lambda b calculation
|
The length of the piston in inches.
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Piston Diam
|
Real (in). Used in Lambda b calculation
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The diameter of the piston in inches.
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Cylinder Diameter
|
Real (in). Used in Lambda b calculation
|
The diameter of the cylinder in inches.
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Surface Area
|
Real (sq. in). Used in Lambda b calculation
|
The surface area contacting both the piston and cylinder.
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|
Poisson's Ratio - Cyl
|
Real. Used in Lambda b calculation
|
Poisson's ratio for the cylinder.
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|
Poisson's Ratio - Piston
|
Real. Used in Lambda b calculation
|
Poisson's ratio for the piston.
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|
Modulus of Elast - Cyl
|
Real (psi * E6). Used in Lambda b calculation
|
The modulus of elasticity for the cylinder material. For more information, see Modulus of Elasticity Values for Cylinders and Pistons.
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|
Modulus of Elast - Piston
|
Real (psi * E6) [Ge]. Used in Lambda b calculation
|
The modulus of elasticity for the piston. See the previous table for values for common materials.
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|
Penetration Hardness
|
Real (psi). Used in Lambda b calculation
|
The penetration hardness of the material in psi.
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|
Wear Coeff
|
Real. Used in Lambda b calculation
|
The value of the wear coefficient in the severe-wear region. For more information, see Wear Coefficients.
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|
Applied Load
|
Real (lb). Used in Lambda b calculation
|
The applied load in pounds of force.
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|
Sliding Dist
|
Real (in). Used in Lambda b calculation
|
The total distance that the piston slides or the stroke length.
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|
Leakage Rate
|
Real (in cubed/sec). Used in Lambda b calculation
|
The leakage rate past the piston.
|
|
Viscosity
|
Real (Lbf-sec/in^2). Used in Cv calculation
|
The viscosity of the fluid. Entered values are multiplied by xE-8 to obtain actual viscosity. Fluid viscosity changes with temperature. For more information, see Viscosity.
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|
Pressure Differential
|
Real (psi). Used in Lambda b calculation
|
The pressure differential in psi across the piston.
|
|
Material Hardness Ratio
|
Real. Used in Ccp calculation
|
The ratio of the hardest particle to the cylinder hardness expressed as a percentage. For more information, see Material Hardness.
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|
Filter Size
|
Real (microns). Used in Ccp calculation
|
The system filter size in microns.
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|
Contaminant Rate
|
Real.(Gram/gpm). Used in Ccp calculation
|
The expected rate of contaminant generation per hour. For more information, see Contaminant Rates.
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|
Activation E Constant (K)
|
Real (Degrees K). Used in Ct calculation
|
Must be given in Degrees K. The valid range is from 1200 to 6000.
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|
Temperature Rise
|
Real (Degrees C). Used in Ct calculation
|
The temperature rise from the ambient subassembly temperature to this component. The temperature rise plus the ambient temperature is equal to the operating temperature of the device.
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|
Cycles/Hour
|
Real
|
The number of cycles/hour. This is required to convert failure ratings from failures/cycle to failures/hour.
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|
[Derating Parameters]
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For more information, see Derating Parameters.
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