基于实测的三车道交通流扰动波数值模拟研究  

Numerical simulation on three-lanes traffic flow disturbance wave based on observation

作　　者：朱辉[1] 吴正[1] 

机构地区：[1]复旦大学力学与工程科学系,上海200433

出　　处：《水动力学研究与进展（A辑）》2008年第3期301-308,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(10772050)

摘　　要：在录像观测数据的基础上,提出了更为符合实际的三车道不同车道间车辆换道的源汇项。在此基础上完善了三车道车辆换道的连续性方程,并与动量方程一起组成完整的数学模型。对三车道扰动问题与单车道进行模拟比较,发现扰动波传播速度几乎相同,只是三车道扰动更容易衰减。对不同形式的三车道交通流数值模型进行对比分析后,发现不同模型下扰动波的定性发展趋势几乎相同:中低密度扰动幅度逐渐衰减,中高密度扰动幅度有先衰减后增大的趋势,且各向异性模型下扰动波幅度增大的趋势更强烈。According to video data,the source and sink function of different vehicles changing lanes on the three-lane was proposed,that is more close to the real situation. On the basis of the function,the three-lane continuity equation was improved. Together with momentum equation,the three-lane continuum traffic model was set up. By comparing disturbance wave speed in three-lanes with that in single lane,there is little difference between them. But the fluctuation range in three-lane declines more quickly. Numerical results show that the models based on different source-sink item and momentum equation have similar characteristics. The fluctuation range under middle-lower vehicle density declines gradually,the fluctuation range under middle-higher vehicle density declines first and increases later,and the trend of amplitude grows much stronger in anisotropic model.

关 键 词：交通流 扰动波 三车道 数学模型 数值模拟 

分 类 号：TV131[水利工程—水力学及河流动力学] U491.112[交通运输工程—交通运输规划与管理]