Method |
Kind of method |
Events at the beginning |
Failures combination |
Figure aids
|
Advantages |
Disadvantages |
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in duc tive |
de duc- tive |
mix -ed |
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Failure modes and Effects |
yes |
|
|
Ways of failure of components |
no |
Analytical tableaux |
give a first list of defects can be developed under some classification of failures |
non quantitative can be too long just for simple defects |
Diagram of Success |
|
yes |
|
Functions of the systems |
yes |
Diagrams of successes |
can be deduced from functional diagram, liability calculus, repair calculus |
not proper for complex situations, nor complex maintenance treatments |
Causal Tree |
yes |
|
|
Ways of failure of components |
yes |
Tree of causes |
allows to identify all causes lead to a given failure, shows some hidden relations, wide applicability |
too huge tree hard to examine, some gaps in complex systems or complex maintenance systems |
Table of truth |
|
yes |
|
Undesirable events |
yes multiphase |
Table of truth |
study systematically all combinations of failure, probability calculus, other then bi |
for system with few components, not for complex relations, not for repairing systems |
Summarize of breakdown combination |
yes |
|
|
Event of the beginning |
yes multiphase |
Tree of consequences |
identify any abnormal function-ning, detailed analysis of failures, study of interacting subsystems |
difficult and can be very long, not for too sequential systems, not much for quantitative analysis |
Tree of Conse -quences |
yes |
|
|
Ways of failure of components |
yes |
|
identify all consequences of a generic event, shows interactions, possible quantitative simulations |
non exhaustive, needs other methods for analyzing generic events, not for complex systems |
Causes Conse -quences diagrams |
|
|
yes |
Event of the beginning |
yes |
Causes -consequences diagrams |
simultaneous study of causes and consequences, shows dependant relations between causes and consequences |
not for complex systems, in some ways specific |
Space of States |
yes |
|
|
Working and breakdown states of the systems |
yes multiphase |
Graph of states |
identify all states of functioning and break down, quantitative measures of liability, availability |
can turns very complex, easier just for markovian and half-markovian processes. |
Source: nfm |
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