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FMEA and FMECA - Failure Mode, Effects, and Criticality Analysis

Overview

Failure Mode, Effects and Criticality Analysis
The FMEA is a reliability modeling method, based on an qualitative approach, whilst the FMECA (Extension of FMEA) takes a quantitative approach and assigns a criticality and probability of occurrence for each given failure mode. FMECA is a procedure, which should be implemented during the design phase to identify potential design weaknesses (failure modes) in a system and classify them according to their severity and probability of consequences.

The main objective of the FMECA is to improve design thus eliminating as many system failures and hazards as possible, to increase the probability of a fail-safe operating, and to reduce the risk and failure rate of consequential damage. The FMECA is a bottom to top analysis in which the designer assigns for each part a list of failure modes and the effects of those failure modes on the system behavior.

FMEA/FMECA requires the following steps in the design process :

  • Defining system block diagram and functional interrelationships
  • Identifying all potential failure modes in the system including effects of the failure mode from the basic function of the system up to the upper system function
  • Analyzing the system failure modes and their potential severity category
  • Defining all failure detection methods, including failure rates
  • Identifying and recommend redesign action to reduce the risk of critical failures
  • Identifying the problems that couldn't be reduced by the design and recommend the necessary action to control the failure risk.
FMECA Project

Datasheet

Key Features:
  • Handles hardware/software functional trees with no limit on function levels, number of assemblies, or number of failure modes
  • Calculates failure mode probabilities
  • Automatically propagates failure mode effects to the next-highest block. This methodology is utilized throughout the product tree to assign the system end effects.
  • Provides a new type of effect: Sibling Effect. A Sibling Effect propagates failure modes to an effect of a sibling block in a similar manner as described above for next-higher effects.
  • Allows defining good modes as well as failure modes.
  • Converts the FMECA tree into a Fault Tree (if the Fault Tree Module is available for the user) that includes all causes and effects.
  • Performs safety and hazard analysis with user defined severity & probabilities.
  • Contains libraries for components and assembly information. (Failure modes only- not reliability prediction rates)
  • Provides access to a library of both standard and user defined failure mode names, causes, effects, compensating provisions, and detection methods.
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