User Documentation

6
Scope and standards
1438130000/02/07-2018
FMEDA(FailureMode,E󰀨ectsandDiagnostic
Analysis):
Systematic way to identify and evaluate the e󰀨ects
of di󰀨erent component failure modes, to determine
what could eliminate or reduce the chance of failure,
and to document a system in consideration.
Failureratesλ:
λ
SD
Total failure rate for safe detected failures
λ
SU
Total failure rate for safe undetected failures
λ
DD
Total failure rate for dangerous detected fail-
ures
λ
DU
Total failure rate for dangerous undetected
failures
MTTF(MeanTimeToFailure):
Mean time between two failures. MTTF is a basic
measure of reliability for non-repairable systems.
Proof-test interval (T
proof
):
Interval between periodic tests performed to detect
failures in a safety-related system.