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地理学报  2007 

旅行分布的重力模式与交通模型的关系

DOI: 10.11821/xb200708006, PP. 840-848

Keywords: 交通问题,双约束重力模型,对偶规划,平衡因子,旅行成本调整

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Abstract:

从交通问题的对偶规划出发,引入由Beckmann和Wallance,Golob和Beckman等提出的不确定性效用方法,建立交通问题和双约束重力模型的关系。证明当旅行者效用概率分布密度函数的标准差趋于零时,双约束重力模型中的距离摩擦系数趋于正无穷,由双约束重力模型确定的旅行分布使得总的交通成本达到最小。在这种关系中,双约束重力模型中平衡因子的作用是市场调整旅行终点服务价格进而调整旅行者消费者剩余的结果。通过建立的分析方法对北京、上海、广州、西安、武汉、成都和昆明等七个城市间航空交通的应用,发现多数航线的模拟较好。结果表明各终点的差异性、消费者偏好的不同、交通工具的替代性和旅行目的之差异性等可以导致一些较大的误差,这些差异性可以采用对起终点对的单位交通费用的调整来体现,从而达到较好的模拟和分析效果。

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