Analysis of one-server two-unit parallel system subject to degradation

A two-unit parallel system supported by (n− 2) standbys with general and non-identical lifetimes

“…consider situations of a two-unit system where the standby unit does not operate instantaneously, but a fixed preparation time is required to put standby and repaired units into operation. Several workers including Gopalan et al (1986), Gupta and Goel (1990), and Murari and Maruthachalam (1981) have analysed two-unit system models under a variety of assumptions using the regenerative point technique. In all these system models, it is assumed that the lifetimes are uncorrelated random variables.…”

A two-non-identical-unit parallel system with correlated lifetimes

“…Several workers including Gopalan et al (1986), Gupta and Goel (1990) , Murari and Maruthachalam (1981) two-unit parallel system models under di erent sets of assumptions using the regenerative point technique. In all these system models it is assumed that the lifetimes are uncorrelated random variables, but in practical situations this seems to be unrealistic because in many cases there may be some sort of correlation between the lifetimes of operating units.…”