Inventory planning for spare parts networks with delivery time requirements

Abstract

Motivated by real life, we introduce a new inventory model for spare parts where we\nexplicitly take delivery time requirements into account. In this single-echelon, multilocation\nnetwork, demand of a customer can be satisfied from multiple warehouses,\nbut only if the customer can be reached from a warehouse within a time limit that is\nspecified in the service contract of the customer. A delivery to a customer from a warehouse other than the closest one is referred to as a lateral transshipment. We develop\na fast and accurate approximate algorithm to evaluate the performance of the network\nunder given base stock levels and propose a fast and effective heuristic to set base stock\nlevels. Numerical experiments show that planning with lateral transshipments can lead\nto cost savings up to 47% when compared to planning without lateral transshipments.\nFurthermore, we show the importance of taking lateral transshipments into account\nwhen designing a spare parts network.