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Optimal replacement policy and inspection interval for condition-based maintenance

机译：基于状态的维护的最佳更换策略和检查间隔

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摘要

In condition-based maintenance (CBM), replacement policy is often defined as a rule for replacement or leaving an item (or a system) in operation until the next inspection, depending on monitoring results. The criterion for determining the optimal threshold for replacement, also known as optimal control limit, is to minimise the average maintenance costs per unit time due to preventive and failure replacements over a long time horizon. On the one hand, higher frequency of inspections provides more information about the condition of the system and, thus, maintenance actions are performed more effectively, namely, unnecessary preventive replacements are avoided and the number of replacements due to failure is reduced. Consequently, the cost associated to failure and preventive replacements are decreased. On the other hand, in many real cases, inspections require labour, specific test devices, and sometimes suspension of the operations and, thus, as the number of inspections increase, the inspection cost also increases. In this paper, preventive and failure replacement costs as well as inspection cost are taken into account to determine the optimal control limit and the optimal inspection interval simultaneously. The proposed approach is illustrated through a numerical example.
机译：在基于状态的维护（CBM）中，替换策略通常被定义为替换项或替换项（或系统）在下次检查之前仍处于运行状态的规则，具体取决于监视结果。确定最佳更换阈值的标准，也称为最佳控制极限，是为了在较长的时间范围内将预防性更换和故障更换所引起的每单位时间的平均维护成本降至最低。一方面，较高的检查频率提供了有关系统状态的更多信息，因此，可以更有效地执行维护操作，即，避免了不必要的预防性更换，并减少了由于故障引起的更换次数。因此，降低了与故障和预防性更换相关的成本。另一方面，在许多实际情况下，检查需要人工，特定的测试设备，有时需要中止操作，因此，随着检查次数的增加，检查成本也增加。在本文中，考虑了预防和故障更换成本以及检查成本，以便同时确定最佳控制极限和最佳检查间隔。通过数值示例说明了所提出的方法。

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