低碳运输下陆路运输系统货流转移及流量分配综合优化

Integrated optimization of transfer of freight flow in land transportation system and transportation flow assignment based on low carbon emissions

基于公路网和铁路网在货物运输过程中的不同特点,研究了可以实现低碳交通运输目标的陆路运输系统货流转移及流量分配的综合优化问题,并构建了相应的0-1规划模型.该模型以包含碳排放成本在内的陆路运输总成本最小化为目标函数,约束条件设置为节点的转移能力限制、公路运输弧段和铁路运输弧段的通过能力限制以及铁路网流量分配的树形径路特点等.通过算例对该模型进行验证.结果表明:鉴于铁路运输在成本和碳排放方面的优势,公路网货流转移至铁路后,可使包含碳排放成本在内的陆路运输系统总成本大大降低;通过对铁路网货流进行重新分配,优化了铁路货流的运输路径,提高了铁路运输能力的利用率.

Based on the different characteristics of highway and railway freight transportations,the integrated optimization of transfer of freight flowin the land transportation system and the transportation flowassignment was studied to achieve the goal of lowcarbon transportation,and the corresponding0-1 mathematic model was put forward. The objective function of the proposed model was to minimize the total cost of the land transportation system including the cost of carbon emission. The constraints of the model were set as the transfer capacity limitation of the railway nodes,the transportation capacity limitation of highway and railway transportation arcs,and the tree-type routing characteristics of railway transportation flowassignment and so on. A numerical case was given to solve the proposed model. The results showthat due to the advantages of rail transport in terms of cost and carbon emission,the total cost of the land transport system,including the cost of carbon emission,is greatly reduced after the transfer of freight flow. In addition,through the reassignment of freight flowof railway network,the transport paths are optimized and the utilization rate of the railway is improved.