| Abstract: | Markov models are used to obtain closed form solutions of the reliability of a series-parallel system. The system consists of two identical equipment in series. Each equipment has one component. To improve equipment reliability, extra component is connected in parallel with the original one. Therefore; each equipment is considered as 2-component fault-tolerant one. The component has a Poisson failure, and a repair of contant rate. The system fails if at least one equipment is out of order. |
