Fluctuation Mechanism and Control on System Instantaneous Availability

General Continuous Availability Model ◾ 33

requirement (i.e., the error of any time within 20 days shall be less than 0.01). Such

objectives can be expressed with the following mathematical expression:

At At t

() ()

−≤∀∈











0.01 0, 20 .

First, determine the approximation number n according to accuracy requirement:

{}

()

=δ≤nN

N

inf|20 0.01

.

Table 3.1 shows corresponding error upper bounds of different approximation

numbers. To ensure intuitional instruction, in Figure 3.2, error bound functions of

system approximate availability for approximation number is equal to 2, 4, and 5

are presented. From the figure, it can be seen that in time interval [0, ...