摘要
考虑到新进入网络的交通需求不了解路径的完备信息,可能随机地选择出行路径,提出一个改进的网络交通流演化模型,并分析了该模型及其不动点的一些特性.该模型不动点不是传统意义下的用户均衡态或部分用户均衡态,它能更好地反映现实中交通流分配结果.格子网络上完成的数值模拟结果表明,模型可用来近似刻画实现用户均衡态的过程,模型中初始可行路径流量可以为零,交通流能够收敛到不动点,但可能存在多个不动点.
Considering such a fact that the traffic demand freshly entering a network doesn＇t have perfect information about traffic condition and may then choose routes randomly, we present an improved network tragic flow evolution model in this paper. The model＇s properties and fixed points are investigated. The fixed points of the model, which are different from traditional user equilibrium state or part user equilibrium state, can better formulate the result of traffic flow assignment in realization. Simulation results obtained from a grid network show that the model can be used to approximately model the process of realizing user equilibrium state, the network flow can in deed evolve to one or more fixed points and the initial values of all available path flows can be zero.
出处
《系统工程理论与实践》
EI
CSCD
北大核心
2009年第1期118-123,共6页
Systems Engineering-Theory & Practice
基金
国家自然科学基金委创新研究群体基金(70521001)
国家"973"计划(2006CB705503)
关键词
OD需求变异
网络交通流
演化模型
不动点
OD demand mutation
network traffic flow
evolution model
fixed point
