Expanded Applications of FMECA

  • 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

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