RELIABILITY MODELING OF 2-OUT-Of-3 REDUNDANT SYSTEM SUBJECT TO DEGRADATION AFTER REPAIR
This paper has been designed with an aim to study a reliability model for 2-out-of-3 redundant system in which unit becomes degraded after repair. There is a single server who plays the dual role of inspection and repair. The system is considered in up-state if any of two original and/or degraded units are operative. Server inspects the degraded unit at its failure to see the feasibility of repair. If repair of the degraded unit is not feasible, it is replaced by new one. The original (called new) unit gets priority in operation over the degraded unit. The distributions of failure time of the units follow negative exponential while that of inspection and repair times are taken as arbitrary with different probability density functions. Various reliability and economic measures are obtained by using semi-Markov process and regenerative point technique. Graphs are drawn to depict the behavior of MTSF, availability and profit of the model for a particular case.