In theSemi-Markov model with time omission,it is difficulttoobtain analytical solution of the systems reliability.Although the analytical solution can be obtained,the explicit expression is very complicated.Based on this,numerical simulation about availability of theSemi-Markovmodel with repair time omission will be introduced by usingMatlab.Meanwhile,gives figures of availability,which provide help for reliability analysis.%在具有时间忽略的半马尔科夫模型中，系统的可靠性指标很难得到解析解。即使得到解析解也是非常复杂的。利用Matlab对具有维修时间忽略的半马尔科夫可修系统的可用度进行了数值模拟，并给出了可用度的图形趋势，为系统进行可靠性分析提供了帮助。
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