城市复杂交通网络道路重要性评估方法

Importance Evaluation Method in Urban Complex Traffic Road Network

提出了一种基于场论的复杂路网路段重要性评估方法,与现有场论评估方法的区别在于:利用引力场理论,在节点间的引力定义中模拟了拥堵排队现象;在路段节点的引力场定义中考虑了路段节点的引力场表示不仅仅和邻接节点相关还和周围其它节点都相关;利用路段节点的引力场表示方法定义了路段重要性的评估函数。由于路段重要性评估函数是一个衰减指数函数,其取值在路网发生拥堵时会产生大量的0值或趋于0的相同值而无法对这些节点进行重要性评估,因此评估函数引入了参数μ,β用于引力场取值的调节。仿真实验在成都市路网上验证了该评估方法,结果表明:该方法能动态反应路网关键路径上路段节点的拥堵程度,并且参数μ,β的取值在增加时能在路网十分拥堵的情况下调节节点的引力场的取值,提高了评估的准确性和精度。

This paper presents an evaluation method of section importance based on the field theo- ry in complex network of roads. The main differences with respect to previous evaluation method of field theory are as follows. Using the theory of gravity, gravity between the nodes in the defi- nition to simulate the congestion queuing phenomenon; Sections of gravitational field node said not only associated with adjacent nodes, and other surrounding nodes. Based on this considera- tion, defines the gravitational field of the road node representation method~ Using the gravita- tional field of the road node representation method to define evaluation function of importance Considering the evaluation function in the network congestion occurs will produce a large amount of 0 or tends to zero to evaluate the importance of these nodes in same, evaluation function pa- rameters are introduced. The importance of the experimental results in Chengdu city road net- work show that the proposed road evaluation method on the dynamic response to the key network node congestion degree, and the parameters, the increase in value of time can very congestion in road network when adjust the value of the gravitational field of the node, improve the accuracy and precision of the assessment.