摘要
对城市交通网络客流疏散安全性进行评估,能够实现城市交通安全稳定运行,对客流疏散安全的评估,需要分析交通网络客流参数以及它们之间的关系,并对其进行计算。传统方法采用背景差法获取交通背景和前景,对轨迹跟踪获得的交通流参数之间的映射关系,但忽略了对基本交通网络客流参数的分析,导致评估精度低。提出一种城市交通网络客流疏散安全评估方法。上述方法对影响评估结果的基本交通网络客流参数以及它们之间的关系进行分析和计算。将城市交通网络客流疏散安全评估问题看做支持向量机最佳超平面求解问题。对于交通网络客流参数同类样本采用相同的权值,给出两类样本数的比例关系并确定城市交通网络客流疏散数据样本重要度权值,实现客流疏散安全评估。仿真结果表明,所提方法评估精度高,对城市交通网络客流疏散安全状态的评估结果与实际调查结果相吻合。
To assess the safety of passenger flow evacuation in urban traffic network can achieve safe and stable running of urban traffic. To evaluate the safety of passenger flow evacuation needs to analyze passenger flow parameters in traffic network and calculate them. The traditional method ignores the analysis of passenger flow parameters in basic traffic network, which results in low accuracy of assessment. Therefore, a method to assess safety of passenger flow evacuation in urban traffic network was proposed. The method analyzed and calculated the passenger flow parameters in basic traffic network impacting assessment result and the relationship among parameters. Then, this method regarded safety assessment problem of passenger flow evacuation in urban traffic network as the optimal hyperplane solution of support vector machine. Moreover, the method used the same weight values for similar samples of passenger flow parameters in traffic network and gave the proportional relation between two kinds of sample numbers. Finally, we determined the importance weight values of data sample of passenger flow evacuation in urban traffic network. Thus, we achieved safety assessment of passenger flow evacuation. Based on simulation results, we can see that the assessment accuracy of proposed method is high. Meanwhile, the assessment results of safety status of evacuation of passenger flow in urban traffic network are accordant with actual survey findings.
作者
陈之强
王辛岩
CHEN Zhi - qiang1 , WANG Xin -yan2(1.College of Continuing Education, Tibet University, Lhasa Tibet 850000, China; 2. College of Engineering, Tibet University, Lhasa Tibet 850000, China)
出处
《计算机仿真》
北大核心
2018年第10期226-229,308,共5页
Computer Simulation
基金
基于驾驶员交通特性的高原公路线形安全设计研究(51768063)
关键词
城市交通
客流疏散
交通事件
评估
Urban traffic
Passenger flow evacuation
Traffic incident
Assessment
