元胞自动机交通流NS模型中走停车辆的相变研究

On the Phase Transition by go—and—stop cars in NS model

为了研究单车道NS元胞自动机模型中的相变问题,定义了走停车的比率,通过计算机模拟的方法,讨论了利用走停车比率作为序参量时车流从自由流到堵塞流的相变特征,并与利用紧挨车辆密度作为序参量时的情况进行了比较,发现走停车比率更适合作为描述交通系统相变的序参量.

In this paper,the problem of phase transition in NS traffic model is studied.The ratio of go—and—stop cars to all cars is defined,and the character of phase transition from free flow to jammed flow is studies through computer simulation.Compared with the ratio of closer cars to all cars,the ratio of go—and—stop cars to all cars is more appropriate to describe the phase transition.