考虑回滞现象的可变元胞传输模型与仿真设计

摘要

A CTM road model in consideration of the hysteresis phenomenon is proposed based on CTM road model, which make up the large error caused by the description of the trafifc on congested roads by original model. To a certain extent, the true and reliability of CTM was improved by the new model. Simulation results show that in the traffic in the metastable zone, traffic density as phase transition from free lfow to congested lfow is often higher than that from congested lfow to free lfow.%交通流测量中的一个典型测量是流量-密度关系图，该关系图可用来展示交通流量和车流密度之间的函数关系。元胞传输模型中的流量-密度服从三角形形式的函数关系，然而实测的流量密度关系往往像是希腊字母λ的镜像，这是因为存在回滞现象的原因。文中在基于CTM路段模型的基础上，提出了考虑回滞现象的CTM路段模型，从而弥补了原始模型在描述拥挤路段上的车流传播所引起的较大误差，在一定程度上提高了CTM的真实性和可靠性。仿真结果表明：在车流处于亚稳态区时，自由流到拥挤流相变时的车流密度往往高于拥挤流到自由流相变的车流密度。