基于随机运输路径选择的物流中心选址模型

摘要

旨在以物流系统总费用最小化为目标进行物流中心选址规划.政府做出物流中心选址规划后,客户会选择合适的供应商进行交易,并根据已有物流中心与交通流分布进行货物运输路线决策,使其总费用最少.论文提出了物流中心选址双层规划模型,考虑投资费用的约束,保证用户平衡的同时使整个物流系统总费用最低.其中上层规划目标是使物流系统总费用最小化,下层规划建立了一个Logit随机用户均衡模型,并构造了一个等价的凸规划问题.最后针对模型提出了一个算法,并通过算例说明其可行性.%In the paper, distribution center location planning is studied, with the goal of minimizing the total cost of the logistics system.The government determines the distribution center location plan.The clients choose appropriate suppliers and travel routes to minimize the total cost, given the distribution center plan and traffic flow conditions.A bi-level programming model is proposed to minimize the total cost of the logistics system, considering user's equilibrium and investment constraints.The upper level program aims at minimizing the total cost of the logistics system, and the lower level program describes a Logit-based stochastic user equilibrium.The lower level problem is then transferred into an equivalent convex programming model.An algorithm is developed to solve the bi-level model, and is demonstrated by a numerical example.