3.5 Phased‐Mission System
Phased‐mission systems (PMSs) involve multiple, consecutive, and nonoverlapping phases of operations during the mission (Section 2.3.3). Based on the mini‐component concept (Section 3.5.1), this section presents an extension of the SEA method, called PMS SEA to consider effects of ELC in the reliability analysis of nonrepairable PMSs (Section 3.5.2).
3.5.1 Mini‐Component Concept
Esary and Ziehms introduced the mini‐component concept in 1975 for handling s‐dependence across phases for a given component in the PMS . The concept is to replace a component in each phase of the PMS with a series of s‐independent mini‐components. Specifically, a component A in phase i is replaced by a series of mini‐components a1, a2, …, ai performing s‐independently with logic relation of Ai = a1a2…ai, meaning that A is functioning in phase i (i.e. Ai = 1) if and only if (iff) this component...