Download 191-16-06

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50(191) 0 IEC
LIST OF SYMBOLS
l(t)
n(t,, f2)
P Cl)
.ü (fl, t21
(Instantaneous)
failure rate.
Mean failure rate.
(Instantaneous)
repair rate.
Mean repair rate.
Asymptotic availability.
A
Instantaneous availability.
A(t)
Asymptotic mean availability.
A
A(?,, f2) Mean availability [in time interval (fi, tu)].
Fault modes and effect analysis.
FMEA
Fault modes, effects and criticality analysis.
FMECA
Fault tree analysis.
FTA
M(tl, rd Maintainability.
Mean accumulated down time.
MADT
Mean administrative delay.
MAD
Mean down time.
MDT
Mean logistic delay.
MLD
Maintenance man-hours.
MMH
Mean repair time.
MRT
Mean operating time between failures.
MTBF
Mean time to failure.
MTTF
M’I-TFF Mean time to first failure.
Mean time to restoration.
MTTR
Mean up time.
MUT
R(~I, tu) Reliability.
Asymptotic unavailability.
u
Instantaneous unavailability.
u(t)
Asymptotic mean unavailability.
ü
vtt,, 12)Mean unavailability.
(Instantaneous)
iailure intensity.
z(t)
ict,,fz) Mean failure intensity.
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AND ABBREVIATIONS