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供需不确定条件下的预算-超额用户平衡模型

, PP. 113-120

Keywords: 交通工程,预算-超额用户平衡,变分不等式,交通分配,行程时间预算,可靠性,不可靠性

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Abstract:

?为更加全面、准确反映随机路网中出行者规避风险的择路行为,以预算-超额行程时间作为出行者选择路径的依据,提出了一种供应及需求不确定条件下同时考虑可靠性和不可靠性的交通分配模型——预算-超额用户平衡模型,推导了需求服从Gamma分布、路段通行能力服从均匀分布条件下预算-超额行程时间的解析表达式,并以此为基础建立起用等价变分不等式表示的平衡模型。利用一个小型测试网络比较了用户平衡模型、基于可靠性的用户平衡模型以及预算-超额用户平衡模型的性能。研究结果表明:提出的模型是有效、可行的;其平衡流量模式不同于用户平衡模型和基于可靠性的用户平衡模型;随着需求水平、可靠度以及路段通行能力退化程度的增加,预算-超额行程时间随之增加。

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