FMEA - Failure Modes and Effects Analysis
The main goal of the FMEA (Failure Mode and Effect Analysis) is to prevent failures. Therefor it belongs to the important tools of the quality planning. It is assumed that the general meaning is known.
iQ-FMEA has been developed under various aspects:
the system has to meet the practical requirements according to the VDA series of publications
it has to support the structured process of FMEA sessions through algorithms, tables and methods the history of a FMEA is to be shown for every step of improvement
experiences (knowledge base) of previous FMEAs have to be able to enter in current FMEAs. Therefor certain parts of a FMEA are emphasized as standard. They are independent of the current product or process.
employees without a lot of knowledge about information processing have also be able to use the FMEA
FMEA header, that contains general information for the most common standard forms FMEA versions; each version describes a segment of the FMEA-development
system elements as units for analysis functions of a system element possible malfunctions of a function integrated knowledge base
extensive provisions for action management
The structure elements in detail
FMEA id and short description FMEA type
method of evaluation material
initial part/process or optimization analysis extensive text description
entire status of the FMEA
FMEA can have several versions.
One version describes the FMEA progress from the realisation of corrective actions to the recommendation of further actions. A new version closes the predecessor.
cost input after each session; time and money investments in persons; direct costs cost cumulation over all sessions of a version and over the whole period of a FMEA divers further management data on version level
System elements (SE)
any number of system elements in a version
assignment of a system element to a SE class. This makes it possible to define arbitrarily structured search criteria (knowledge base).
SEs can be ordered hierarchically in a parts list structure
Function and error tree
SEs within the SE hierarchy are in following relationship with each other: the function of the inferior SEs (rubberlip) builds a chain to the superior (sealing ring), the function tree
one FMEA may contain several function trees
the function tree can be set up top down or bottom up
errors on a lower level can automatically be taken as a failure cause on a higher level complete support of system FMEA (see form)
failure analysis can be considered in isolation for each malfunction failure analysis can be made within the function tree
a failure can cause several consecutive failures
a failure can result from several reasons
you can assign the RPZ factor meaning to a failure sequence
you can assign the RPZ factor occurrence probability and detectability to a failure cause B, E and A from a catalogue, which can be created by the user (VDA, DGQ etc.)
The complete feature set of iQ-Projekte is used differentiation in preventive actions (design engineer) and detecting actions (later quality assurance) information about responsible person, appointments, performance, estimation of planned improvements etc. appointment traceability, follow-up actions in case of missed deadlines etc.
form for complete FMEA
form for certain system elements
structure and identification of FMEAs and SEs, which appear similar in other constructions or processes (for example bore for fit, rotation and parallel translation)
search algorithms based on class systems
adoption of already described SEs, depending on RPZ-experiences
history of a FMEA about the version Pareto-diagram to a version over RPZ
graphic comparison of the RPZs over SEs and functions between two versions standard forms