17-05-2013, 12:23 PM
FMEA Failure Mode and Effects Analysis
[attachment=54056]
What is an FMEA?
Description:
A procedure that examines each item in a system, considers how that item can fail and then determines how that failure will affect (or cascade through) the system
Acronyms
FMEA: Failure Modes and Effects Analysis
FMECA: Failure Modes and Effects and Criticality Analysis
Motivation for Conducting a FMEA
Improves design by discovering unanticipated failures
Highlights the impact of the failures
Potentially helpful during legal actions
Provides a method to characterize product safety
Often required (e.g. FDA and DOD procurement)
Method to Conduct an FMEA (taken from ASM Handbook Vol. 11)
Identify all components or systems at given level of the design hierarchy.
List the function of each identified component or system.
Identify failure modes for each component/system. Typically there will be several ways in which a component can fail.
Determine the effect (both locally and globally) on the system.
Classify the failure by its effects on the system operation.
Determine the failure’s probability of occurrence.
Identify how the failure mode can be detected (may point out what needs to be inspected on a regular basis).
Identify any compensating provisions or design changes to mitigate the failure effects.
DESIGN FMEA (DFMEA)
The Design FMEA is used to analyze products before they are released to production.
It focuses on potential failure modes of products caused by design deficiencies.
Design FMEAs are normally done at three levels – system, subsystem, and component levels
This type of FMEA is used to analyze hardware, functions or a combination
PROCESS FMEA (PFMEA)
The Process FMEA is normally used to analyze manufacturing and assembly processes at the system, subsystem or component levels.
This type of FMEA focuses on potential failure modes of the process that are caused by manufacturing or assembly process deficiencies.
[attachment=54056]
What is an FMEA?
Description:
A procedure that examines each item in a system, considers how that item can fail and then determines how that failure will affect (or cascade through) the system
Acronyms
FMEA: Failure Modes and Effects Analysis
FMECA: Failure Modes and Effects and Criticality Analysis
Motivation for Conducting a FMEA
Improves design by discovering unanticipated failures
Highlights the impact of the failures
Potentially helpful during legal actions
Provides a method to characterize product safety
Often required (e.g. FDA and DOD procurement)
Method to Conduct an FMEA (taken from ASM Handbook Vol. 11)
Identify all components or systems at given level of the design hierarchy.
List the function of each identified component or system.
Identify failure modes for each component/system. Typically there will be several ways in which a component can fail.
Determine the effect (both locally and globally) on the system.
Classify the failure by its effects on the system operation.
Determine the failure’s probability of occurrence.
Identify how the failure mode can be detected (may point out what needs to be inspected on a regular basis).
Identify any compensating provisions or design changes to mitigate the failure effects.
DESIGN FMEA (DFMEA)
The Design FMEA is used to analyze products before they are released to production.
It focuses on potential failure modes of products caused by design deficiencies.
Design FMEAs are normally done at three levels – system, subsystem, and component levels
This type of FMEA is used to analyze hardware, functions or a combination
PROCESS FMEA (PFMEA)
The Process FMEA is normally used to analyze manufacturing and assembly processes at the system, subsystem or component levels.
This type of FMEA focuses on potential failure modes of the process that are caused by manufacturing or assembly process deficiencies.