考虑横向转运的线状需求物流节点选址研究

铁路线路建设需要大量物资，沿拟建线路布局物流节点对成本控制具有重要意义。为决策物流节点的位置及其相应的服务区域，考虑拟建线路物资需求的不确定性，引入物流节点间的横向转运策略，以运营总成本最小为目标，建立了线状需求下的设施选址?库存模型。在分析模型性质的基础上，设计了基于线搜索的求解算法。算例分析表明，横向转运增加一定的转运成本和运输成本，但大幅降低了物流节点的库存成本，进而降低运营总成本，考虑横向转运对物流节点的选址和服务区域决策有一定的影响。

Logistics Node Location with Curved Demand and Lateral Transshipment

Location of logistics nodes along the proposed railway is of great significance to provide logistics service because a lot of materials are required in a railway construction project. With the uncertainty of the material demand, a lateral transshipment strategy between two logistics nodes is applied to optimize the location of the logistics nodes and their corresponding service area, so as to control the logistics cost of the project. To minimize the total operation cost, a facility location-inventory model is developed with curved demand. On the basis of analyzing the properties of the model, an algorithm based on linear search is developed. The computational experiment shows that lateral transshipment induces to an increase of transshipment and transportation cost, together with more reduction of inventory cost. As a result, the total operation cost goes down. The optimal location of logistics nodes changes with lateral transshipment considered, and so does their corresponding service area.