区域综合货运枢纽布局优化模型研究

区域综合货运枢纽布局优化是区域综合运输体系规划的重要内容之一。首先，基于区域货运系统运输费用最小，建立了区域综合货运枢纽布局优化模型。然后，提出了基于联合运输的区域货物综合运输网络构建方法，并在一般联合运输路径概念的基础上，提出了货物联合运输合理可行路径的三个约束条件，即合理的方式序列、合理的运距和合理的换装次数。其次，提出了基于超级网络和遗传算法的模型求解方法，并在枢纽之间增加了虚拟专用路径。最后，通过算例对模型及求解方法进行了验证。

Study of optimal location of regional multi-modal freight hubs

The layout optimization of regional comprehensive freight hubs is one of important parts of the planning of regional comprehensive transportation system. In this paper, first, a layout optimization model of regional comprehensive freight hubs is established to minimize the total cost of the freight transportation system. Next, a method based on intermodal transport is proposed to describe the regional comprehensive freight transportation network. Then, with the concept of normal intermodal transport route, three constraints, namely reasonable mode sequence, reasonable transport distance and reasonable transfer number, are presented to search for an optimal route. Moreover, a solving method of the proposed model is given based on the super network and the genetic algorithm, and a virtual special route is introduced in the hubs. The proposed model and its solving method are finally verified by a hypothetical analytical example. The results indicate that the model coincides with practical situation, and that it is an effective path of the layout optimization of regional comprehensive freight hubs.