在现有的计划更换模型的基础上，研究了一种备件有限及部件可修的更换策略问题。

Based on the present models of planned replacement, this paper studies on the problem of replacement policy with repairable units and limited spares.

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在假定故障部件不能“修复如新”的条件下，基于几何过程模型研究可修串联系统的最优更换策略。

An optimal replacement policy for series repairable system is studied assuming that the component after repair is not "as good as new" by using the geometric process model.

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利用几何过程，以系统大修次数N和大修时间间隔T为更换策略，选择最优策略（ N ， T）使系统经长期运行单位时间的期望费用最小。

The problem is to determine the optimal replacement policy ( N , T )? such that the long-run expected cost per unit time is minimized.

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