Study on optimal inventory strategy for worn spare parts on the Chinese space station

Xinian Jia, Jia-Chun Shi, Gong Wang, Mengying Zhang
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Abstract

The demand for spare parts on the Chinese Space Station is always uncertain, meaning that an inventory for parts is difficult to confirm. A key problem on the space station is how to minimize the expected backorder number with limited resources. In this paper, a multi-ECHELON inventory model for worn spare parts based on the METRIC (Multi-ECHELON technology for recoverable items control) model was proposed to solve this problem. First, the principle of the METRIC model was analyzed and some of the hypotheses of the traditional METRIC model were adapted to form a new METRIC model known as GENE-METRIC Next, the marginal analysis method was applied to find the optimal position and number of spare parts needed. Finally, a numerical example was given to illustrate the use of the new GENE-METRIC model. The paper argued that the new GENE-METRIC model could provide a quantifiable approach to confirm the stock level of worn spare parts and could therefore be used to inventory and allocate the worn spare parts as needed for the Chinese Space Station.
中国空间站易损件最优库存策略研究
中国空间站对备件的需求总是不确定的,这意味着零件的库存很难确认。如何在有限的资源条件下使空间站的预期缺货数量最小化是空间站面临的一个关键问题。针对这一问题,提出了一种基于METRIC (multi-ECHELON technology for recoverable items control)模型的易损件多级库存模型。首先,分析了METRIC模型的基本原理,对传统METRIC模型的一些假设进行了修正,建立了新的METRIC模型GENE-METRIC;其次,利用边际分析法求解了零件的最优位置和最优数量;最后,给出了一个数值算例来说明该模型的应用。该论文认为,新的GENE-METRIC模型可以提供一种可量化的方法来确认磨损备件的库存水平,因此可以用于库存和分配中国空间站所需的磨损备件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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