基于模糊旅行时间的动态交通分配模型.pdfVIP

2005 10 Oct ber 2005 31 10 J urnal f Beijing University f Aer nautics and Astr nautics V l. 31 N 10 王 力 王川久 沈晓蓉 范跃祖 ( , 100083) : 提出了一种新的模糊动态交通分配( FDTA) 模型, 采用模糊集合理 描述动态旅行时间, 应用模糊h 截集的最短路径方法找出模糊最短路径集合, 计 算各条路径的隶属函数, 并采用CLOGIT 模型实现网络加载, 最后比较了FDTA 模型 和经典的随机动态交通分配( SDTA) 模型. 仿真结果显示: 在正常交通状况下FDTA 模 型能够获得与SDTA 模型非常接近的分配结果, 并更加符合实际的交通状况; 当有交 通拥堵事故施工管制等动态交通状况发生时, FDTA 模型能够解决动态交通状况 的建模问题; 当交通网络结构复杂时, 通过改变 h 值可以有效减少模糊最短路径的 数量, 提高计算效率. : 动态交通分配; 模糊旅行时间; 最短路径; 截集 : U 491 : A : 2005) Dynamic traffic assignment model based on fuzzy travel time Wang Li Wang Chuanjiu Shen Xia r ng Fan Yuezu ( Sch l f Aut mati n Science and Electrical Engineering, Beijing University f Aer nautics and Astr nautics, Beijing 100083, China) Abstract: A new fuzzy dynamic traffic assignment ( FDTA) m del was pr p sed. Firstly, the fuzzy the ry was used t describe the realtime link travel time and path travel time. Sec ndly, fuzzy sh rtest path sets were f und based n hlevel sets, and then their membership functi ns were calculated. Thirdly, the CLOGIT m del was used f r netw rk l ading. At last, FDTA m del was c mpared with classical st chastic dynamic traffic assignment ( SD TA) m del using a small traffic simulati n netw rk. The simulati n results sh w that FDTA m del can achieve m re reas nable netw rk traffic fl w, and the retically res lve the pr blem f traffic netw rk dynamic traffic fl w m deling as the c ngesti n, traffic incidents r c nstructi n happened. Further, when the traffic netw rk bec mes c mplex, by changing the value f h , the number f fuzzy sh rtest paths c uld be decreased and the c mputati n efficiency c uld be impr ved greatly. Key wor