系统可用度是可靠性和维修性的综合反映，常用的马尔可夫方法无法给出可修复机电产品的系统可用度计算公式。
System availability is the comprehensive reflection of reliability and maintainability. The system availability calculation formula cannot be derived by common Markov method.
以设备许用可用度为约束条件，以维修成本最低为目标，以维修周期为变量，建立设备维修优化模型。
The allowable availability was selected as constraint, the maintenance cost was identified as optimization objective, the maintenance cycle was as optimal variable, the optimization model was set up.
并在寿命、修理延迟和维修时间均服从指数分布的情况下，用马尔可夫更新过程理论导出了系统的可用度。
When the distribution of life, delayed repair and imperfect repair time are all exponential, Markov renewal process for educing the availability is presented.
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