All opportunity-triggered replacement policy for multiple-unit systems
All opportunity-triggered replacement policy for multiple-unit systems
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DOI：
10.1109/24.475996
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发表时间：
1995-12
影响因子：
5.9
通讯作者：
Xitong Zheng
中科院分区：
文献类型：
--
作者：
Xitong Zheng
提出了一个由n个单元组成的系统的模型。这些单位的危险率随着时间的推移而增加。当设备出现故障或使用年限超过T时，以先发生者为准更换。更换机组时，更换机龄在（T-w，T）区间内的所有运行机组。故障更换和主动更换都为预防性更换其他部件创造了机会。该政策允许关节更换，避免了更换新单元、停机时间和对单元寿命分布的不切实际的假设所带来的缺点。提出了一种计算稳态成本率的算法。以最小的平均总重置成本率为目标，求出最优的T&W。通过数值算例说明了结果的应用和分析。
A model is presented for a system which consists of n i.i.d units. Hazard rates of these units are increasing in time. A unit is replaced at failure or when the age of a unit exceeds T, whichever occurs first. When a unit is replaced, all the operating units with their age in the interval (T-w,T) are replaced. Both failure replacement and active replacement create the opportunities to replace other units preventively. This policy allows joint replacements and avoids the disadvantages resulting from replacement of new units, down time, and unrealistic assumptions for distributions of unit life. An algorithm is developed to compute the steady-state cost rate. Optimal T&W are obtained to minimize the mean total replacement cost rate. Application and analysis of results are illustrated through a numerical example.