论文部分内容阅读
为了更好地研究道路危险品运输网络的拓扑特性,通过分析危险品道路运输路径选择模型特点和所面临的问题,建立了适用于危险品道路运输网络的、规范的、准确的一套体系和标准。以成都市为例,使用Arc GIS和Matlab软件初步设计和建立了道路危险品运输拓扑网络,统计了相关拓扑基础数据,并仿真生成相同规模的随机拓扑网络。对比发现:成都市危险品道路运输拓扑网络具有随机网络特性,主要表现为节点度频次分布服从泊松分布。分别通过线性拟合、高斯拟合、幂律拟合,以拟合优度值选择发现:节点度累积概率分布服从泊松分布;节点度分布中的主要集中节点度为2~4,平均节点度为2.968 2。这些表现特征可为危险品运输相关政府部门、运输公司提供危险品道路运输网络设计相关的科学有效方法。
In order to better study the topological characteristics of the road transport network of dangerous goods, by analyzing the characteristics and problems of road transport route selection model of dangerous goods, a set of normative and accurate system for road transport network of dangerous goods standard. Taking Chengdu as an example, the ArcGIS and Matlab software were used to preliminarily design and establish a road transport network of dangerous goods, and the basic data of the relevant topologicals were calculated and simulated to generate a random topology network of the same scale. It is found that the topological network of dangerous goods road transport in Chengdu has random network characteristics, which is mainly that the frequency distribution of nodes follows Poisson distribution. The results of fitting goodness-of-fit values show that the cumulative probability distribution of node degree obeys Poisson distribution, the degree of main concentration node in node degree distribution is 2 ~ 4, the average node The degree is 2.968 2. These performance characteristics can provide relevant scientific departments and transport companies with relevant scientific and effective methods for the design of road transport network of dangerous goods.