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多种Logit路径选择模型对多层次交通网络的性能影响

, PP. 129-134

Keywords: 交通工程,交通网络,层次特征,Logit路径选择模型,数学规划,行程时间

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Abstract:

研究了多种Logit路径选择模型应用于多层次交通网络时对网络性能的影响。依据网络层次特征定义了广义路径费用;选取4种典型的Logit模型——单层的多项式Logit(MNL),C-Logit(CL),Path-SizeLogit(PSL)以及双层的交叉巢式Logit(CNL)模型,对它们分别构建了适用于多层次网络的等价数学规划模型(MP);对不同层次结构和分散参数取值,利用VC++编程求解4个等价数学规划模型,并计算了系统最优的流量分配。分析表明3种OD需求下的所有Logit模型所得网络总行程时间费用(NTTC)都高于通过系统最优分配得到的NTTC;利用考虑重叠的CL、PSL、CNL模型所得NTTC皆大于不考虑重叠的MNL模型,且构造越复杂的Logit模型所得NTTC越高;对各个Logit模型而言,层次性交通网络的NTTC要小于没有层次性的情况且层次越高时NTTC越小。

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