城市物流网络演化模型与算法

基于城市空间结构与物流网络的相互影响关系，以宏观机制结合L-OD四阶段法构建城市物流网络演化模型与算法，研究城市物流网络的演化规律。在短期内，综合考虑运输时间、燃油费用构造广义物流费用函数，并建立流量分配模型；在较长时期，利用介数中心度、区域间经济联系等概念刻画物流网络演化机制，设计演化算法。仿真结果表明，随着城市物流网络的演化，网络总费用随之升高，但网络单位费用则呈现阶段性降低的现象；物流通道出现了层次现象并越来越清晰，物流网络逐渐向有序演化，物流系统性能得以不断优化。

Urban logistics network evolution model and algorithm

Based on the mutual effect of urban spatial structure and logistics network, an urban logistics network evolution model and algorithm to reveal the logistics network evolution laws are proposed according to the macroscopic mechanism and L-OD four-stage method. In the short term, travel time and fuel cost are taken into account to formulate generalized logistics cost function. Furthermore, a flow distribution model is established. In the long run, betweenness centrality and economic relation intensity are utilized to describe the evolutionary mechanism and algorithm. Simulation results show that with the logistics network evolving, the network total cost increases, but network unit cost reduces periodically. Hierarchy of logistics corridor emerges and turns clearer, and logistics network evolves to a more orderly structure with improving performance.