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Numerical study of inventory management under various maintenance policies

机译：各种维护策略下库存管理的数值研究

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Capital assets, such as manufacturing equipment, require maintenance to remain functioning. Maintenance can be performed when a component breaks down and needs replacement (i.e., corrective maintenance), or the maintenance and part replacement can be performed preventively. Preventive maintenance can be planned on a periodic basis (periodic maintenance), or it can be triggered by a certain monitored condition (condition based maintenance). Preventive maintenance policies are gaining traction in the business world, but for many companies it is unclear what their impact is on the resulting inventory requirements for the spare parts that are used for the maintenance interventions. We study the impact of the maintenance policy on the inventory requirements and the corresponding costs for a setting that is realistic at an OEM in the compressed air industry. Preventive policies increase the total demand for spare parts compared to corrective maintenance, since the former do not exploit the entire useful life of the components. This leads to higher inventory requirements. At the same time, the preventive policies inhibit advance demand information, as the interventions, and correspondingly the spare parts demands, are planned in advance. Using a simulation study, we show that by using this advance demand information in managing the spare part inventory, the increase in inventory requirements of preventive maintenance policies can to a large extent be offset; for condition-based maintenance, we find that inventories can even be lower compared to corrective maintenance, provided that the advance demand information is used correctly when managing inventories. Our analysis sheds light on the behaviour of the inventory related costs under various maintenance policies. (C) 2017 Elsevier Ltd. All rights reserved.
机译：资本资产（例如制造设备）需要维护才能保持运转。可以在组件发生故障并需要更换时进行维护（即纠正性维护），也可以预防性地进行维护和零件更换。预防性维护可以定期进行计划（定期维护），也可以由某些受监视的状况触发（基于条件的维护）。预防性维护策略在商业世界中越来越受欢迎，但是对于许多公司而言，尚不清楚它们对维护干预所用备件的最终库存需求有何影响。我们研究了维护策略对库存要求的影响以及在压缩空气行业OEM可以实现的实际设置中的相应成本。与纠正性维护相比，预防性策略增加了对备件的总需求，因为前者并未利用组件的整个使用寿命。这导致更高的库存要求。同时，预防措施会抑制事先的需求信息，因为干预措施以及相应的备件需求是事先计划好的。通过仿真研究，我们表明，通过使用这些预先需求信息来管理备件库存，可以在很大程度上抵消预防性维护策略的库存需求增长；对于基于状态的维护，我们发现与校正维护相比，库存甚至可以更低，只要在管理库存时正确使用预先需求信息即可。我们的分析揭示了在各种维护策略下与库存相关的成本的行为。 （C）2017 Elsevier Ltd.保留所有权利。

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