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Age-related maintenance versus reliability centred maintenance: a case study on aero--engines

机译：与年龄相关的维护与以可靠性为中心的维护：航空发动机的案例研究

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摘要

Reliability Centred Maintenance (RCM) is a procedure carried out as part of the logistic support analysis (LSA) process and is described in the US Department of Defence Military Standards (Mil Std 2173). RCM allows logisticians the opportunity to determine the best main- tenance policy for each component within a system. However, the only data that are available to carryout RCM using Mil Std 2173 are of MTBF. This implies that all the necessary mathematical models need to be based on the exponential distribution. This is a serious drawback to the whole concept of RCM as the exponential distribution cannot be used to model items that fail due to wear, or any other mode that is related to their age. In this paper, a new approach to RCM is proposed using the concepts of soft life and hard life to optimise the total maintenance cost. For simplicity, only one mode of failure is considered for each component. However, the model can be readily applied to multiple failure modes. The proposed model is applied to find the optimal maintenance policies in the case of military aero-engines using Monte Carlo simulation. The case study shows a potential benefit from setting soft lives on relatively cheap components that can cause expensive, unplanned engine rejections.
机译：以可靠性为中心的维护（RCM）是作为后勤支持分析（LSA）流程的一部分执行的程序，在美国国防部军事标准（Mil Std 2173）中进行了描述。 RCM使物流人员有机会确定系统中每个组件的最佳维护策略。但是，使用Mil Std 2173进行RCM唯一可用的数据是MTBF。这意味着所有必要的数学模型都必须基于指数分布。这是RCM整个概念的一个严重缺陷，因为指数分布不能用于建模由于磨损或与年龄相关的任何其他模式而失败的项目。本文采用软寿命和硬寿命的概念，提出了一种新的RCM方法，以优化总维护成本。为简单起见，每个组件仅考虑一种故障模式。但是，该模型可以很容易地应用于多种故障模式。所提出的模型适用于使用蒙特卡洛模拟的军事航空发动机情况下的最优维修策略。案例研究表明，通过在相对便宜的组件上设置软寿命来带来潜在的好处，这会导致昂贵的，计划外的发动机报废。

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