Session 3.2: Criticality Analysis

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Session 3.2: Criticality Analysis

SESSION 3.2 OUTLINE

3.2.1: Criticality Analysis Definitions 3.2.2: Criticality Analysis � Risk Priority Number (RPN) 3.2.3: Assigning RPN Criticality Parameters in MADE 3.2.4: Generating a FMECA (RPN) report 3.2.5: Alternative Criticality Analyses in MADE 3.2.6: Criticality Profile Editor

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.1 CRITICALITY & CRITICALITY ANALYSIS DEFINITION (MIL-STD-1629A)

Criticality: A relative measure of the consequences of a failure mode and probability of occurrence Criticality Analysis (CA): A procedure by which each potential failure mode is ranked according to

                             the combined influence of severity and probability of occurrence

Types of Failure Mode, Effects & Criticality Analysis (FMECA) in MADE: Risk Priority Number (RPN) Fuzzy Risk Priority Number (Fuzzy RPN) Criticality Analysis (MIL-STD-1629) Hazard Risk Index (HRI)

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.2 CRITICALITY ANALYSIS � RISK PRIORITY NUMBERS (RPN)

Risk Priority Number (RPN) is calculated using 3 criticality parameters:

1) Occurrence (How often does it fail?)
2) Severity (How bad are the failures?)
3) Difficulty of Detection (How hard is it to detect these failures?)

Example: Difficulty of Detection (9) = 288 Risk Priority Number = O � S � D = Failure Path Criticality No. [Local Failure Mode] Occurrence (8) � Severity (4) �

                              [Local Failure Mode] [End Effect Severity]

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.3 ASSIGNING RPN CRITICALITY PARAMETERS IN MADE

Criticality factors are assigned to Faults & Failure Modes in the MADE model The table below shows where the Occurrence, Severity and Difficulty of detection parameters are editable

for a RPN FMECA report

Failure Concepts Occurrence Severity Difficulty of Detection Failure Condition (Local Item) Yes No Yes Fault (Local Item) Yes No Yes Failure Mode (Local Item) Yes Yes* Yes Failure Mode (End Effect Item) Yes Yes Yes

*Local Failure Mode severity is overwritten by End Effect Item Failure Mode severity

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.3 ASSIGNING RPN CRITICALITY PARAMETERS IN MADE

Criticality factors are assigned to Faults & Failure Modes in the MADE model The criticality calculation for each failure mode follows the following procedure

                            Start

Take the earliest value of the Use the end effect item to Take the earliest value of the visible path to determine determine the severity visible path to determine occurrence difficulty of detection

O S D

                            RPN = O X S X D
                                   End

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.3 ASSIGNING CRITICALITY PARAMETERS FOR RPN (CONTINUED)

Criticality Parameters for Faults, Failure, and Failure Modes conditions can be found in the Criticality tab of Properties

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Session 3.2: Criticality Analysis

EXERCISE 3.2.3 SET FUEL TANK CRITICALITY

To edit criticality values, open the Criticality editor by:

Select Analyses Criticality & Reliability Editor from the menu bar Expand the System Tree to show the Corroded fault for the Lining' part in the Fuel Tank' component Change their Difficulty of Detection value to 6.0 and Occurrence value to 9.0

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Session 3.2: Criticality Analysis

EXERCISE 3.2.3 SET COUPLING CRITICALITY

Expand the System Tree and select: Mechanical � rotational � Angular Velocity failure mode of the Coupling 1' component in the Diesel Engine'

Change Difficulty of Detection value to: 5.0 Under the High section set Occurrence to: 1.0 Under the Low section, set Occurrence to: 6.0

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Session 3.2: Criticality Analysis

EXERCISE 3.2.3 SET CONTROL UNIT CRITICALITY

Expand the System Tree to show the Dielectric strength decreased faults in the `Control Unit' component Change Difficulty of Detection value to 7.0 and Occurrence value to 7.0

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Session 3.2: Criticality Analysis

EXERCISE 3.2.4 GENERATE A FMECA (RPN) REPORT

To generate a FMECA (RPN) report:

Select Reports Report Wizard from the menu

Under Criticality select FMECA (RPN, PHMT)

Set Level of Analysis to System

Set `Power Generation' as the End-Effect item

Select after each page

Confirm Report Format customizations

Confirm Company Details

Select to generate the report

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Session 3.2: Criticality Analysis

EXERCISE 3.2.4 GENERATING A RPN FMECA REPORT (CONTINUED)

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.5 ALTERNATIVE CRITICALITY ANALYSES IN MADE

FMECA (MIL-STD-1629A) uses a different set of criticality parameters (see table below) In order to edit these values using the Reliability Editor you must be in the RAM module

                                                         Criticality Parameters

Location Failure Effect Probability Failure Mode Ratio () Failure Rate (p) Operating Time (t) () Fault (Local Item) Yes Yes� No No Failure Mode (Local Item) Yes� Yes No No Reliability Editor (Local Item) No No Yes Yes� Mission Profile No No No Yes

�Criticality Parameter is overwritten when Failure Diagram is present �Criticality Parameter is overwritten when Mission Profile is present

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.6 CRITICALITY PROFILE EDITOR

Criticality Profile Editor is used to manage default and user-defined Criticality profiles.

Criticality profiles can be application-based or project-based

   Project-based: saved to a specific MADE project file
   Application-based: saved to a user profile/local PC

There are 6 default Criticality Profiles:

   PHMT 1629A Criticality (MIL-STD-1629A)
   PHMT Fuzzy Criticality (Fuzzy Criticality)
   PHMT ISO26262 Criticality (ISO26262)
   PHMT RPN Criticality (Risk Priority Number)
   PHMT Risk Assessment Criteria (FAA) (ARP 4761 Rev A)
   PHMT Risk Assessment Method (RAC) (MIL-STD-882E)

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Session 3.2: Criticality Analysis

DISCUSSION 3.2.6 CRITICALITY PROFILE EDITOR (CONTINUED)

Criticality Profile Editor is divided into:

1. Overview/Management page � where Criticality Profiles are managed
2. Criticality Profiles landing pages shows a summary of:

          Criticality factors
          Range charts
          Fuzzy Membership Graphs
          Severity terms

3. Criticality Profile sub-pages

          Setup for individual criticality factors
          Setup for fuzzy rule base

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Session 3.2: Criticality Analysis

EXERCISE 3.2.6 CREATION OF CRITICALITY PROFILE

To create a custom Criticality Profile:

Select

Enter Profile Name: Custom ARP Profile

Select a Criticality Profile Type: ARP 4761 (Rev A)

Select to create the new Criticality Profile

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Session 3.2: Criticality Analysis

EXERCISE 3.2.6 CREATION OF CRITICALITY PROFILE (CONTINUED)

In the Application Preferences, double click the newly created profile. Select to unlock profile and enable customization of the profile Terms, ranges and colour can be adjusted

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Session 3.2: Criticality Analysis

EXERCISE 3.2.6 CREATION OF CRITICALITY PROFILE (CONTINUED)

When Criticality Profile has been customized, return to the Overview/Management Tab Select the Customer ARP Profile and select to copy the Custom ARP Profile to the Project Profiles Confirm details by selecting The Custom ARP Profile will be copied to Project Profiles To set the profile as the Active Project Profile, select it from the drop-down menu

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Session 3.2: Criticality Analysis

SESSION 3.2 SUMMARY

3.2.1: Criticality Analysis Definitions 3.2.2: Criticality Analysis � Risk Priority Number (RPN) 3.2.3: Assigning RPN Criticality Parameters in MADE 3.2.4: Generating a FMECA (RPN) report 3.2.5: Alternative Criticality Analyses in MADE 3.2.6: Criticality Profile Editor