有时间约束的城市配送网络结构研究

城市配送网络结构设置应考虑服务水平和成本两个影响因素。针对有时间限制的货物配送，以城市配送网络总费用最小化为目标，研究不同配送需求下的最优城市配送系统结构，建立非线性混合0—1规划模型。用蚁群算法求解，得出满足时间约束且使系统成本最小的城市配送网络层数和节点设置情况。对城市配送网络的设置进行实例分析，以验证模型和算法的可行性，为城市配送网络的建设、运营和优化提供理论依据。

Urban Distribution Network Structure with Time Restrains

Setting urban distribution network structure should consider service level and cost. For the city goods distribution with time limit, a nonlinear O-1 integer programming model for optimal urban distribu- tion network structure analysis under different distribution requirements is created with the target of mini- mizing the total cost of urban distribution network. The model is solved by ant colony algorithm to obtain urban distribution network layers and the setting of nodes that meet the time constraints and minimize the cost of the system. The setting of urban distribution network is proved by a practical example to verify the feasibility of the model and algorithm. It can provide theoretical basis for construction, operation and opti- mization of urban distribution network.