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
(
TS
/
)
0
0
f t dt
()
t
Reliability indices of the UNR (0; )
ft cfx S
( )
=
( )/
;
0
[
]
Pt c
( )
=
0.5
( ) ;
x
−Φ
0
 
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