
180 ◾ System Instantaneous Availability
e calculation results of Schemes 1 through 8 in Table 6.3 show that with
a → 0, the volatility of system instantaneous availability range will gradually
decrease until it disappears. erefore, this verifies the conclusion that as long
as the failure rate or repair rate is time variant, the system instantaneous avail-
ability may have volatility.
6.4 Volatility Control of System Instantaneous
Availability during Equipment Life Cycle
e concept of equipment life cycle management (LCM) was proposed by the
U.S. Department of Defense in the 1970s and was used for procurement man-
agement of weapons; this w