Environmental Engineering Reference
In-Depth Information
-
1. 18
Curves
f
(
t
) and
f
(
t
).
[
]
l =
()
t
f t Pt
()/ ()
=
f xS
( )/
0.5
−Φ
( )
x t
=l
().
The TND for the positive operating time to failure - the range of
(0; ∞) has the c.d.f.
ft cft
()
=
(),
0
where
c
0
is the normalising factor determined by the condition:
∞
∫
c f t dt
( )
=
1,
0
t
and is equal to (as above):
1
1
1
1
c
=
=
=
=
.
0
∞
Q Q
(
∞−
)
(0)
Φ∞−Φ−
(
)
(
TS
/
)
0.5
+Φ
(
TS
/
)
∫
0
0
f t dt
()
t
Reliability indices of the UNR (0;
∞
)
ft cfx S
( )
=
( )/
;
0
[
]
Pt c
( )
=
0.5
( ) ;
x
−Φ
0
Search WWH ::
Custom Search