Abstract
This paper presents a 0–1 programming model aimed at obtaining the optimal inventory policy and transportation mode for maintenance spare parts of high-speed trains. To obtain the model parameters for occasionally-replaced spare parts, a demand estimation method based on the maintenance strategies of China’s high-speed railway system is proposed. In addition, we analyse the shortage time using PERT, and then calculate the unit time shortage cost from the viewpoint of train operation revenue. Finally, a real-world case study from Shanghai Depot is conducted to demonstrate our method. Computational results offer an effective and efficient decision support for inventory managers.
Highlights
As an energy-saving and environmentally friendly transportation mode, railways have attracted much attention in recent years
Ever since the Beijing-Tianjin high-speed rail line was put into operation in 2008, the accumulative mileage of all high-speed electric multiple units (EMU) trains has reached more than 3.74 billion km and a considerable number of EMU trains have reached their overhaul cycles [3]
This issue is even trickier for occasionally-replaced spare parts (OSP) that are required within an EMU overhaul process because their demand is highly random, with little historical data and lacking in statistical samples
Summary
As an energy-saving and environmentally friendly transportation mode, railways have attracted much attention in recent years. China’s railway owns 2,395 electric multiple units (EMU) trains, providing more than 4,200 high-speed train services and delivering more than 4,000,000 passengers every day on the HSR network. Determining how many spare parts should be stored in EMU depots has become an urgent scientific problem for the high-speed railway system [6]. This issue is even trickier for occasionally-replaced spare parts (OSP) that are required within an EMU overhaul process because their demand is highly random, with little historical data and lacking in statistical samples. If the transportation costs of EMU spare parts are low, and the parts can be delivered in time, a zero inventory strategy is worth pursuing. As inventory and transportation are highly correlated [7], their joint optimization represents a critical and important task for inventory managers
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