| 城市快速路交通流速密关系模型优化研究 |
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| 引用本文： | 吴正,郭明旻,许谦.城市快速路交通流速密关系模型优化研究[J].力学学报,2012,44(4):709-717. |
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| 作者姓名： | 吴正 郭明旻 许谦 |
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| 作者单位： | 1. 复旦大学力学与工程科学系, 上海 200433;
2. 嘉兴广播电视大学, 嘉兴 314000 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 从实测得到的210920中国城市快速路“车速-车头间距”数据中, 选取包含26773条数据的3个样本作为不同类型交通流的代表, 对多个交通流“速-密关系”模型 进行参数优化和拟合优度比较研究, 给出优化模型参数的定性和定量规律. 修正形式的 Kerner-Konhauser平衡函数和Payne平衡函数通过参数优化, 分别在畅通和拥挤条件下具有 优度相对最高的拟合结果, Greenshields模型(等价地, m=3时的一维管流模型)则对介于 两种条件之间的实测数据具有优度相对最高的拟合结果.
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| 关 键 词： | 交通流模型 实测数据 参数优化 拟合优度 |
| 收稿时间： | 2011-12-19 |
| 修稿时间： | 2012-02-22 |
STUDY ON OPTIMIZATION OF TRAFFIC FLOW VELOCITY-DENSITY MODELS FOR URBAN FREEWAY |
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| Wu Zheng,Guo Mingmin Xu Qian.STUDY ON OPTIMIZATION OF TRAFFIC FLOW VELOCITY-DENSITY MODELS FOR URBAN FREEWAY[J].chinese journal of theoretical and applied mechanics,2012,44(4):709-717. |
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| Authors: | Wu Zheng Guo Mingmin Xu Qian |
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| Affiliation: | 1. Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China;
2. Jiaxing TV and Radio University, Jiaxing 314000, China |
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| Abstract: | Traffc flow models are important means to describe various complex traffc procedures and to establish intelligence traffc systems of urban freeway.Generally the formation of a traffc flow model requires massive observation as well as in-depth analysis of real road traffc.Empirical data are indispensable to identify the parameters of the corresponding model.It is drawn in this paper that 210 920 "car velocity-headway distance" data pairs are obtained from the long time video recordings of urban freeway in four Chinese cities.Three traffc flow data-samples are made up of parts of these measuring data and are applied to an optimization study of several manifold well-known traffc flow velocity-density models.Some qualitative and quantitative results of the optimal free velocity value in the models have been obtained.The superiorities of modified Kerner-Konhauser equilibrium function and Payne’s one are found in simulating the measuring data under the traffc condition of be free and be crowd,respectively,while Greenshields model(i.e.1D pipe fluid model when m = 3) can give the satisfying results for the measuring data when the traffc condition is between free and crowd. |
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| Keywords: | traffic flow model measuring data optimization of parameter superiority of simulation |
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