| Social and economic development have an inseparable relationship with freight transportation, with the continuously adjustment of industry structure, especially the development of high-tech industry, the demand of express freight transportation increases year by year. In order to solve this problem, except for increasing the investment on transportation infrastructure to improve the construction of the transportation network, it also necessary to formulate a reasonable express freight transportation service network. Because the transportation capacity is an evaluation index of express freight transportation service network, it is necessary to calculate the of express freight transportation service network.The express freight is highly sensitive to transportation time. Therefore, for the shippers and freight enterprises, it is necessary to know the transportation time reliability of the express freight transportation service network. In order to production and investment, it is important to know the capacity of the multimode express freight transportation service network under the known transportation time reliability for the shippers. To enjoying a high reputation and raising the income, it is necessary to ensure the reliability of the transportation time and delivery goods as much as possible for the freight enterprises. Therefore, it is necessary to consider the transportation time reliability as a constraint while calculate the capacity of the multimode express freight transportation service network.Based on the summary of the domestic and foreign research on the network capacity, taking the reliability of transportation time into account, this paper researches the problem of the calculation of the capacity of the multimode express freight transportation service network. First, this paper introduces the concept, composition and characteristics of the multimode express freight transportation service network. Secondly, it discusses the capacity concept system of the multimode express freight transportation service network and analyses the factors of affecting the transportation capacity of the service network. Thirdly, this paper introduces the travel time reliability theory. Based on the these theories, the thesis build up a mathematical model considering the reliability of transportation time to calculate capacity of the multimode express freight transportation service network and designs an algorithm to solve the model according to its characteristics. In order to verify the validity of the algorithm, this paper analyzes the complexity of the algorithm. Finally this paper designs an example, and obtained an ideal result while solving this example. |
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