利用在更换周期点上具有的马尔可夫性质，以系统首次故障前平均工作时间最大为目标建立了确定最佳更换周期的模型。

Using the property of Markov at the points of replacement period, a model of determining the optimal period is developed with objective of maximizing the mean time to first failure of system.

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在此情形下，利用几何过程和补充变量法求得了该系统首次故障前的平均时间及另一些感兴趣的可靠性指标。

Under these assumptions, some reliability indices are derived by using the geometric process and the method of supplementary variable.

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方法二针对状态空间巨大的情况，先以一定的标准对状态空间进行截尾，再应用马尔可夫模型获得系统的稳态可用度、首次故障前平均时间、稳态故障频度等可靠性指标。

The other first truncates the state space according to some criterion in view of the explosive number of states. Markov model is introduced to obtain some important reliability indexes.

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