Inventory management model of metro vehicle repairable spare parts based on METRIC

Abstract

Aiming at the inventory management problem of metro vehicle repairable spare parts, a two-echelon inventory model based on METRIC (Multi-Echelon Technique for Recoverable Item Control) theory is proposed. Firstly, analyze the state transition process of metro vehicle repairable spare parts. Secondly, establish the two-echelon inventory management model according to the inventory characteristics of metro vehicle repairable spare parts. Thirdly, take the lowest cost of spare parts as the objective, take metro availability and spare suffice rate as the constraints, apply marginal analysis method to find the optimal position of spare parts among the base and depots. Finally, take the initial spare parts of Guangzhou Metro as the research, use the optimization model based on METRIC theory to optimize the initial spare part number. The results show the model proposed in this paper has a certain significance and reference value to general metro spare part inventory management problem, and can be used in actual operation to provide decision support for the metro managers.