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Reliability with Repair Last revised 12/06/2006

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ASENT RBD Analysis Reliability with Repair
ASENTs RBD Analysis tool supports a number of
different model types. Elements can be modeled in
series, parallel, series-parallel combinations,
and complex active or standby redundancies. ASENT
supports both Mission Reliability and Reliability
with Repair. This presentation will focus on a
Reliability with Repair example. For more details
on RBD Analysis click on the link below, and
select Reliability Modeling to access a 20 page
help file in PDF format. http//www.raytheoneagle.
com/asent/tutorial/help.htm
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ASENT RBD Analysis Reliability with Repair
This tutorial assumes that you have already built
a product tree structure for your project and
that failure rates have been calculated and are
current. If you need help with this please refer
to the Introduction tutorial.
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Step 1 Select Type of Analysis
Two types of RBD analysis are available 1)
Mission Reliability, and 2) Mission Reliability
with Repair. For this tutorial, select
Reliability w/Repair.
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Step 2 RBD Analysis Utility Menu
From the RBD Analysis Utility menu, select the
Set Repair Defaults option.
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Step 3 Edit Project Factors
From the RBD Analysis Utility menu, select the
Set Repair Defaults option. Click on the Edit
Project Factors button and set the values as
desired. Click the OK button when you are
finished setting the project factors.
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Step 4 Specify Repair Defaults
In this example we tell the tool to check lower
level items and either populate or correct RBD
data, if necessary. We also set the default
mean-time-to-repair to 5 minutes. Since the Use
MTBCF and MTTRF factors are checked, ASENT will
use the MTBF and MTTR adjustment factors
specified earlier when we edited the Project
Factors. This is also where we set the default
failover time to restore a function.
This screen appears after the OK button is
selected.
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Step 5 Selecting the RBD Analysis Tab
The default model is to model the blocks in
series. When you click on the RBD Analysis tab in
the Reliability Manager, it will display the
associated model for the item selected. Click on
the Edit option to change or refine the model.
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Step 6 Editing and Refining the Model
This figure shows the reliability worksheet for
the selected item. We will change the model type
to parallel by clicking on the Change Model
Type button.
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Step 7 Specify Number of Required Elements
Use the and - buttons to increase or
decrease the number of blocks or elements that
are required for your parallel model. In this
example, we say that out of the 3 elements in our
model that 1 is required, and the failover time
is 5 minutes.
The type of calculation used depends on whether
or not the failover time is less than the maximum
allowed failover time that was set for the
project.
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Step 8 Reliability with Repair Results
Click on the Show Repair Results button to view
the Reliability with Repair results.
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Step 9 Select the View Diagram Button
Click on the View Diagram button to view the new
Reliability Block Diagram.
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Step 10 Generating Reports
To generate a report, right-click on the item of
interest and select Reports RBD Analysis.
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Generating Reports (Continued)
The RBD Analysis report allows you to report on
just the item that was selected or the entire
subtree. Block diagrams can be included or
omitted depending on the users
preference. Select the report options, as
desired, and click on the OK button.
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Generating Reports Sample Report
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Generating Reports Sample Report Logistics
Data
This concludes a brief tutorial on Reliability
with Repair. For more details, please refer to
the other RBD Analysis tutorials.