Reliability Analysis of 2-Unit Cold Standby Redundant Systems with Repairable and Non-Repairable Failures

This paper discusses the 2-unit cold standby redundant systems with repairable and non-repairable failures. It is assumed that the system has 3 operation modes, 2 repairable failure modes and some non-repairable failure modes. As one repairable failure mode takes place, the system will be repaired and the repairs are perfect, otherwise, it would never operate again when attaining one non-repairable failure mode. Thus, many classical reliability indices may become meaningless for having both repairable and non-repairable failures. For example, the steady state availability and failure frequency would become zero. This paper proposes the definitions of new reliability indices and corresponding calculating methods of the system with repairable and non-repairable failures