
Analysis of Instantaneous Availability Fluctuation ◾ 237
As β
3
further increases to another critical value, the system adaptation time gradu-
ally becomes steady at a certain specified value. As MLDT increases, the corre-
sponding critical value increases, and so does the specified value.
2nd set: Suppose α
1
= 0.99998, β
1
= 2, α
2
= 0.95, and β
2
= 0.85; the failure rate
of the unit monotonically increases, and its repair rate monotonically decreases,
with MTBF = 198.6654 and MTTR = 36.3307. is numerical simulation set is
further divided into three subsets as MLDT varies:
1. Suppose MLDT = 40.1283, then the steady-state availability A = 0.7221