A note on the cost analysis of an n-unit system with

This paper deals with the cost analysis of a non-repairable standby system consisting of(n + m) identical units; n-units are needed for the system to function, while the remaining m units are warm standbys. The online and standby units have different constant failure rates. There is no facility for repair. Functions expressing the probability that in (O, t) there are i on-line failures and j standby failures and thereby the reliability of the system. MTTF and the expected profit are obtained. Finally, a numerical example with graphs is also given to highlight important results like the reliability of the system,MTTF and the expected profit. Copyright (C) 1997 Elsevier Science Ltd.