Expanded Applications of FMECA

Expanded Applications of FMECA

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This book expands the discussion of FMECA beyond the realm of the MIL-STD-1629A hardware approach. Commonly-used commercial standards (SAE J1739 and IEC 60812) are introduced. Hardware and Software FMECA (DFMEA), Process FMECA (PFMEA) and Human Systems Integration (HSI)-based PFMECA methods are discussed, with particular attention given to the process, required information, expected results and analysis alternatives. The concept of an Integrated FMECA (I-FMECA) is also introduced.

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Product Description

Failure Mode, Effects and Criticality Analysis (FMECA) is a reliability evaluation/design technique that examines the potential failure modes within a system and its equipment, in order to determine the effects on equipment and system performance. Historically, FMECA practice has revolved around MIL-STD-1629A and has been primarily limited to hardware. This book expands the discussion of FMECA beyond the realm of the MIL-STD-1629A hardware approach. Commonly-used commercial standards (SAE J1739 and IEC 60812) are introduced. Hardware and Software FMECA (DFMEA), Process FMECA (PFMEA) and Human Systems Integration (HSI)-based PFMECA methods are discussed, with particular attention given to the process, required information, expected results and analysis alternatives. The concept of an Integrated FMECA (I-FMECA) is also introduced.

Additional information

ISBN:

978-1-933904-68-9

Table of Contents

1. Introduction       1
  1.1 FMEA VS FMECA     1
  1.2 PURPOSE AND SCOPE     1
  1.3 FMECA BENEFITS     3
  1.4 FMECA LIMITATIONS     4
2. Common FMECA Characteristics       7
  2.1 TERMINOLOGY     7
  2.2 SEVERITY     8
    2.2.2 SCHEDULING   9
    2.2.3 FMECA TEAM SELECTION   10
    2.2.4 FMECA PROCESS FLOW   11
  2.3 INDENTURE LEVEL     13
  2.4 FAILURE EFFECTS     14
  2.5 MIL‐STD‐1629A VS COMMERCIAL STANDARDS     14
  2.6 SEVERITY     14
  2.7 FREQUENCY OF OCCURRENCE     18
    2.7.1 QUALITATIVE APPROACH   18
    2.7.2 QUANTITATIVE APPROACH   20
  2.8 DETECTION     23
  2.9 CRITICALITY ANALYSIS     24
    2.9.1 CRITICALITY MATRIX   25
    2.9.2 RISK PRIORITY NUMBER (RPN)   27
  2.10 FAILURE MODE CLASSIFICATION     28
3. Hardware FMECA       29
  3.1 HARDWARE FMECA METHODS     29
    3.1.1 PIECE‐PART APPROACH   29
    3.1.2 FUNCTIONAL APPROACH   30
  3.2 HARDWARE FMECA IMPLEMENTATION     33
    3.2.1 FAILURE MODES   33
    3.2.2 FAILURE CAUSES   34
    3.2.3 DETECTION   37
  3.3 HARDWARE FMECA EXAMPLES     38
    3.3.1 PIECE‐PART FMECA EXAMPLE   38
    3.3.2 FUNCTIONAL FMECA EXAMPLE   42
4. Software FMECA       45
  4.1 IDENTIFYING SOFTWARE DEFECTS VIA FMECAS     48
  4.2 SFMECA SEVERITY AND CRITICALITY ASSIGNMENT METHODS     52
  4.3 SUMMARY     58
5. Process FMECA       59
  5.1 INTRODUCTION     59
  5.2 BENEFITS OF THE PFMECA     59
  5.3 ELEMENTS OF THE PFMECA FORM     59
  5.4 ADDITIONAL ELEMENTS     63
  5.5 THE MOST IMPORTANT ELEMENT     64
  5.6 PFMECA EXAMPLE     64
  5.7 SUMMARY     65
6. Human System Integration (HSI) PFMECA       67
  6.1 INTRODUCTION     67
    6.1.1 HUMAN ENGINEERING   67
    6.1.2 HUMAN FACTORS   68
    6.1.3 HUMAN RELIABILITY ANALYSIS   68
    6.1.4 TASK ANALYSIS   69
    6.1.5 ERROR CLASSIFICATIONS   70
    6.1.6 HRA BASE FAILURE RATES   70
    6.1.7 PERFORMANCE SHAPING FACTORS   70
  6.2 PERFORMING THE HSI PFMECA     71
  6.3 BENEFITS AND DRAWBACKS OF HSI PFMECA     72
  6.4 EXAMPLE HSI PFMECA     72
  6.5 SUMMARY     73
7. Integrated FMECA       75
  7.1 GENERAL APPROACH     75
  7.2 SUMMARY     78
8. Summary and Conclusions       79
9. Bibliography       81