Related Topics:

Failure Modes and Reliability Analysis (FMRA)

Performing Calculations with the FMRA

Universal Reliability Definitions (URDs)

Changing Constant Probability Models to Distributions

At times you may need to change a constant probability model to a distribution. For example, to perform simulation-based cost calculations, the software must be able to simulate failure times for the product based on a time-dependent life distribution. Thus, if you try to perform cost calculations using constant (i.e., time-independent) reliability models, then the results of the cost calculation will always be zero. To perform the calculations, you must change any constant model that is considered in the calculation to a time-dependent distribution, as described next.

Tip: As shown in the above example, you can tell whether a model is time-independent by looking at the text displayed in the Model field. If the name of the model is followed by a single decimal number in brackets (e.g., "[0.9]"), then the model is time-independent (in this case, reliability is constant at 90%).

After the QPE solves for the parameters, you can click Update to revise the Model window using the QPE's results.

 

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