Reliability and Survival Methods • Reliability Block Diagram • Configuration Settings
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Configuration Settings
Each component in a Reliability Block Diagram can be assigned a failure distribution. The available failure distributions are listed in Table 10.2. To see the formulas and parameterization for these failure distributions, see Distributions in Life Distribution.
Distribution Configurations
When a component is added to the diagram, an outline for that component appears beneath the Configuration outline.
Note: You can omit a component from the analysis by checking the box next to Omit.
Select a Distribution and enter the required parameter values.
Table 10.2 Distributions and Parameters 
Property Type
Required Inputs
Exponential
Theta
Weibull
Alpha, Beta
Lognormal
location, scale
Loglogistic
location, scale
Fréchet
location, scale
GenGamma
mu, sigma, lambda
DS Weibull
Alpha, Beta, Defective Probability
DS Lognormal
location, scale, Defective Probability
DS Loglogistic
location, scale, Defective Probability
DS Fréchet
location, scale, Defective Probability
Nonparametric
data or data file
To view Configuration settings for the components in a selected design or subsystem, do the following:
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To view the Configuration settings for a specific component, select the component’s shape.
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To view Configuration settings for more than one component, select multiple components’ shapes using the Arrow tool or Control-clicking.
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To view Configuration settings for all components, deselect any shapes by clicking in a blank portion of the Workspace.
For each component in the diagram, you can either omit the component from calculations by checking the box next to Omit or:
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From the Distribution list, select the appropriate distribution. For all selections other than Nonparametric, enter parameter values for the distribution. For Nonparametric, see Specify a Nonparametric Distribution.
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For Series and Parallel components, you must also enter a value for N, the total number of components contained in the series or parallel shape.
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For K out of N components, you must also enter K, the minimum number of components that must function for the system to function, and N, the total number of components in the shape.
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For Knot components, enter the Minimum Available Dependences. The Knot shape enables you to configure a k-out-of-n shape where the shapes that are joined have different distributions. The Minimum Number of Dependencies is k, the minimum number of paths leading to the Knot that need to function in order for the system to function.
Figure 10.16 Example of a Weibull Configuration for a K out of N Shape

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Help created on 7/12/2018