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Reliability Predictions Last revised 08/10/2005

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Introduction

The Reliability Manager is the tool in ASENT that is used to The Reliability Manager is the tool in ASENT that is used to perform a Reliability Prediction. Here, the user can define the perform a Reliability Prediction. Here, the user can define the product tree structure and specify part lists, either by adding them product tree structure and specify part lists, either by adding them one at a time, in groups, or importing them from BOM or CAD files.one at a time, in groups, or importing them from BOM or CAD files.

The product tree structure can be easily built in the Reliability The product tree structure can be easily built in the Reliability Manager. Tree nodes can be added, copied, moved or deleted. Entire Manager. Tree nodes can be added, copied, moved or deleted. Entire trees or sub-trees can be imported either from other ASENT projects trees or sub-trees can be imported either from other ASENT projects or from Excel files.or from Excel files.

Both Operating and Non-Operating predictions can be performed.Both Operating and Non-Operating predictions can be performed.

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Overview

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Reliability Manager Screen Layout

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Invoking the Reliability Manager

To invoke the To invoke the Reliability Reliability Manager merely Manager merely right-click on a right-click on a project and select project and select the Reliability the Reliability Manager menu Manager menu option.option.

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Reliability Mgr. Displays product tree

This screen displays the This screen displays the product tree structure for product tree structure for the DEMO_PRJ project. the DEMO_PRJ project. Click on the Click on the ‘+’‘+’ symbol to symbol to expand a branch in the tree, expand a branch in the tree, and click on the and click on the ‘-’‘-’ symbol symbol to collapse a branch in the to collapse a branch in the tree.tree.

When you right-click on a When you right-click on a item in the product tree, item in the product tree, then a drop-down menu then a drop-down menu will appear.will appear.

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Reliability Mgr. Online Help Book

To pull up the online To pull up the online help, select the Help help, select the Help menu option and select menu option and select Contents and Index. This Contents and Index. This will display the help will display the help books for the active tool.books for the active tool.

This screen shows the This screen shows the user pulling up the help user pulling up the help books for the Reliability books for the Reliability Manager. Manager.

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Reliability Mgr. Online Help Book

For detailed explanations For detailed explanations on menu options, data on menu options, data tabs and other tabs and other information associated information associated with the product tree, with the product tree, select the select the Working with Working with the Product Tree topicthe Product Tree topic. .

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Importing data from other projects

The Import The Import Subtree option Subtree option makes makes importing data importing data from other from other projects easy. In projects easy. In the slides that the slides that follow we will follow we will import a import a MODEM card MODEM card from the from the Computer Computer project to the project to the Chassis of Chassis of DEMO_PRJ.DEMO_PRJ.

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User selects project to import from

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Product tree for the computer project

Here, the user is presented Here, the user is presented with the product tree with the product tree structure of the Computer structure of the Computer project. The user selects the project. The user selects the MODEM card and clicks on MODEM card and clicks on the OK button in order to the OK button in order to import the MODEM card import the MODEM card from the Computer project from the Computer project to the chassis of to the chassis of DEMO_PRJ.DEMO_PRJ.

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Modem is imported to the chassis

After the import, After the import, the MODEM card the MODEM card now appears in the now appears in the chassis of chassis of DEMO_PRJ.DEMO_PRJ.

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Calculate failure rates for entire system

Failure rates can be Failure rates can be calculated at any calculated at any level (part, board, level (part, board, assembly, or the assembly, or the entire system). The entire system). The following failure following failure rate prediction rate prediction methods are methods are included: 217F, included: 217F, 217F-1, 217F-2, 217F-1, 217F-2, Bellcore TR-332 Bellcore TR-332 Issue 6, Telcordia, Issue 6, Telcordia, and the RAC and the RAC Commercial Commercial Practices NonOp Practices NonOp FR method. FR method.

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Calculate failure rates for entire system

At the system level, At the system level, the user specifies the user specifies the prediction the prediction method, method, environment, and environment, and operating operating temperature to be temperature to be used in performing used in performing the failure rate the failure rate prediction. prediction.

Caution: These values should NOT be entered for lower level assemblies or boards unless they are different than the system values. By default, lower level assemblies and boards will inherit the FR Method, By default, lower level assemblies and boards will inherit the FR Method,

Environment and Temperature of their parent.Environment and Temperature of their parent.

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Calculating failure rates

Select the type of failure Select the type of failure rates to calculate (Operating rates to calculate (Operating or Non-Operating) and click or Non-Operating) and click on the Calculate button. on the Calculate button. ASENT will then use the FR ASENT will then use the FR Method that you have chosen Method that you have chosen (i.e. If 217FN2 was selected (i.e. If 217FN2 was selected for Operating failure rates, for Operating failure rates, then ASENT will use MIL-then ASENT will use MIL-HDBK-217F, Notice 2).HDBK-217F, Notice 2).

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Status flags alert user of a problem

Status FlagsStatus Flags

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Failure Rate calculation status flags

The table below describes the meaning of the status flags that The table below describes the meaning of the status flags that appear in the product tree after calculating failure rates.appear in the product tree after calculating failure rates.

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Status flags pinpoint overstressed C0001

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Run troubleshooting on C0001

Below, the troubleshooting option is turned on and the failure Below, the troubleshooting option is turned on and the failure rate for C0001 is re-calculated.rate for C0001 is re-calculated.

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Run troubleshooting on C0001

After the calculation is After the calculation is complete, then ‘Finished’ complete, then ‘Finished’ will be displayed below will be displayed below the status bar, and the the status bar, and the ‘View’ option at the top of ‘View’ option at the top of the window is now the window is now selectable.selectable.

Select the View | Select the View | Diagnostic option to Diagnostic option to display the troubleshooting display the troubleshooting report.report.

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Troubleshooting shows voltage overstress

Here, the troubleshooting report shows that we have a Here, the troubleshooting report shows that we have a voltage overstress condition.voltage overstress condition.

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Correct applied voltage for C0001

Enter a new Enter a new applied voltage applied voltage value for value for C0001. Notice C0001. Notice that the user can that the user can enter either a enter either a value for the value for the applied voltage, applied voltage, or a percent of or a percent of the rated the rated voltage for the voltage for the part. Here, the part. Here, the user sets the user sets the applied voltage applied voltage to 50% of the to 50% of the rated voltage for rated voltage for the part.the part.

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Re-calculated failure rates are OK now

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Report Generation

Reports can be Reports can be generated from any generated from any level in the product tree level in the product tree structure. Right-click structure. Right-click on an item and select on an item and select the Reports option. The the Reports option. The Op Tree FR report is a Op Tree FR report is a very common very common reliability prediction reliability prediction report. It generates an report. It generates an indentured tree indentured tree structure for the structure for the operating failure rate of operating failure rate of the item. the item.

The report can be The report can be sorted by either failure sorted by either failure rate or reference rate or reference designator. It can designator. It can include both assemblies include both assemblies and parts or just and parts or just assemblies only.assemblies only.

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Generating Prediction Reports

Below is a standard failure rate prediction report. From the report viewer, reports are printed by clicking on the Below is a standard failure rate prediction report. From the report viewer, reports are printed by clicking on the printer icon . Reports can be saved in a wide variety of formats by clicking on the icon. printer icon . Reports can be saved in a wide variety of formats by clicking on the icon.

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Failure Rate Sensitivity Analysis

ASENT’s survey tool allows ASENT’s survey tool allows you to calculate failure rates you to calculate failure rates over a range of temperatures over a range of temperatures to see how sensitive you to see how sensitive you design is to increases in design is to increases in temperature. From the Failure temperature. From the Failure Rate Calculator window, it is Rate Calculator window, it is invoked by selecting the invoked by selecting the Temperature Scan option Temperature Scan option from the Analyze menu.from the Analyze menu.

Here, the user has selected a Here, the user has selected a starting temperature of 55 starting temperature of 55 degrees C with 5 degree degrees C with 5 degree increments. ASENT will increments. ASENT will calculate the failure rates based calculate the failure rates based on 55, 60, 65, and 70 degrees.on 55, 60, 65, and 70 degrees.

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Failure Rate Sensitivity Analysis

The results of the temperature scan can be seen by The results of the temperature scan can be seen by selecting the Survey option from the View menu. selecting the Survey option from the View menu. The troubleshooting diagnostics associated with The troubleshooting diagnostics associated with each run can be viewed by selecting the Diagnostic each run can be viewed by selecting the Diagnostic option from the View menu.option from the View menu.

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Exporting Survey Results to Excel

These survey results can be easily exported to Excel by selecting the Export To Excel option from These survey results can be easily exported to Excel by selecting the Export To Excel option from the File menu.the File menu.

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Mission Profiler

The Mission Profiler allows you to define profiles The Mission Profiler allows you to define profiles that depict various operating conditions that your that depict various operating conditions that your product might be exposed to. From the Failure Rate product might be exposed to. From the Failure Rate Calculator, the Mission Profiler is invoked by Calculator, the Mission Profiler is invoked by selecting the Mission Profiler option from the selecting the Mission Profiler option from the Analyze men.Analyze men.

From the Mission Profiler screen you From the Mission Profiler screen you can either select an existing profile or can either select an existing profile or create new ones.create new ones.

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Mission Profiler

New entries are made by New entries are made by clicking on the button.clicking on the button.

Click on the icon below to Click on the icon below to create a new profile.create a new profile.

Profile resultsProfile results

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Mission Profiler Results

Below is the Excel file showing the Mission Profile results. These results are easily exported to Below is the Excel file showing the Mission Profile results. These results are easily exported to Excel by selecting the Export To Excel option from the File menu.Excel by selecting the Export To Excel option from the File menu.