
160 ◾ System Instantaneous Availability
Step two:
Judge whether the value of A(t) is less than that of A when t ∈ [0, M
1
].
From Formula 6.28, eorem 6.5, and
<1,
1
2
M
M
we can know that
AM Af
M
M
M
M
e
M
M
e
M
M
M
M
M
M
−=
=−
++
−
+
<
−
()
1
2
1
1
2
1
1
0.
1
1
2
2
1
2
1
1
2
1
1
2
1
2
So the volatility of instantaneous availability exists.
en, verify the validity of method by the simulation.
Using Formula 6.28, take M
1
= 20 and M
2
= 40, 60, 80, 100, respectively, and
then
=
1
,
1
,
1
,
1
A Simulate the curves as follows: From four groups of curves
in Figure 6.12, the volatility of A(t) exists at one time by the continuity and mar-
ginal stability because the instantaneous av ...