论文部分内容阅读
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“音速”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。数值模拟结果表明改进算法可行。
Based on the research of the existing macroscopic model of traffic flow, the difference method is used to simulate BD traffic flow model. In order to ensure the accuracy and stability of the calculation, the concept of “sonic velocity” is introduced. An improved algorithm of time and space step is proposed to consider the influence of average speed and traffic density in the calculation of time step. Numerical simulation results show that the improved algorithm is feasible.