Session 3.4: Critical Item Analysis

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Session 3.4: Critical Item Analysis

SESSION 3.4 OUTLINE

3.4.1: Find & Replace 3.4.2: Critical Item Analysis 3.4.3: Critical Item List

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Session 3.4: Critical Item Analysis

DISCUSSION 3.4.1 FIND & REPLACE

Find & Replace can be used to bulk edit information in the model (e.g. occurrence)

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.1 REPLACE OCCURRENCE USING FIND & REPLACE

To search and replace item parameters:

Select Edit Find/Replace from the main menu Select the Basic tab Type "?" into the search box and select

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.1 REPLACE OCCURRENCE USING FIND & REPLACE (CONTINUED)

Select the Replace tab Select the Probability/Occurrence value from the parameter drop down list Select the Filter checkbox and

                                                                  Note: Values are updated after selecting Save All

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.1 REPLACE OCCURRENCE USING FIND & REPLACE (CONTINUED)

Deselect failure modes, failure conditions & faults for: Coupling 1', Control Unit' and `Fuel Tank' (including parts)

                                                                  Note: Values are updated after selecting Save All

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.1 REPLACE OCCURRENCE USING FIND & REPLACE (CONTINUED)

Set the new value for model parameter to: 1 Select

                                                                  Note: Values are updated after selecting Save All

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Session 3.4: Critical Item Analysis

DISCUSSION 3.4.2 CRITICAL ITEM ANALYSIS

Identifies critical items based on a criticality threshold

   Fuzzy Criticality
   RPN
   MIL-STD-1629A
   HRI
   MIL-STD-882E
   ARP4761
   ISO 262626

Bar chart will display the number of items in that category

Apply `critical' designation to items in system model

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.2 PERFORMING CRITICAL ITEM ANALYSIS

To perform a critical item analysis on the model:

Select Analyses Critical Item Analysis to open the editor

Select to change End effect to `Power Generation'

Set the Propagation Type as FCM

Set the Criticality Profile to PHMT RPN Criticality

Select and set the RPN threshold value to 200

Select `OK'

Select the button to display top critical items in the chart

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Session 3.4: Critical Item Analysis

DISCUSSION 3.4.3 CRITICAL ITEM LIST

Items with failures above a certain threshold can be marked as Critical Critical Items are flagged in the model with a red symbol A Critical Item List (viewer) can be used to track Critical Items

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Session 3.4: Critical Item Analysis

EXERCISE 3.4.3 APPLY CRITICAL ITEMS TO MODEL

Select to mark items in the

system model with the critical icon

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Session 3.4: Critical Item Analysis

SESSION 3.4 SUMMARY

3.4.1: Find & Replace 3.4.2: Critical Item Analysis 3.4.3: Critical Item List