摘要
在研究了现有的交通流宏观模型的基础上,采用差分方法对BD型交通流模型进行了数值模拟。为保证计算的精度和稳定性,引入“声速”概念;提出了时间和空间步长的改进算法,使得在时间步长的计算中考虑了地点平均车速和交通流密度的影响。数值模拟结果表明了改进算法的可行性。
Thls paper, on the basis of studying the existing macroscopic model of traffic flow, applied difference method to simulating traffic flow model of Model BD. In order to guarantee the precision and stability of the calculation, the paper introduced the concept of＂velocity＂, and proposed an improved algorithm of time and space steps, taking into consideration the influence of place average speed and traffic flow of density in making time step calculation. The numerical simulation result indicates that the improved algorithm is feasible.
出处
《交通与计算机》
2006年第3期14-17,共4页
Computer and Communications
关键词
交通流
离散格式
数值模拟
traffic flow
discrete format
numerical simulation
