دانلود رایگان مقاله طراحی شبکه اکسپرس هوایی بر اساس انتخاب مسیر اکسپرس مطالعه موردی چینی

abstract

Due to the shortage of cargo aircraft, Chinese express companies have to provide transportation services with a hybrid method that consists of “rented bellies and self-owned cargo aircraft”. Because the bellies are rented from air passenger companies and because the cargo aircraft are owned by the express companies, it is important for the express companies to use their cargo aircraft as effectively as possible. This paper constructs a bi-level model to optimize the flight transportation network of an express company. The upper model designs the network and allocates the transportation capacity with the objective of minimizing the total transportation cost, and the lower model calculates the link flows in user equilibrium. Data from ShunFeng (SF) Express Company (China) are used to conduct the case study. Using the model outputs, the flows on links and at nodes are analyzed to illustrate the transportation and transshipment situations.

7. Conclusions

This paper constructs a bi-level model for optimizing the flight networks of express companies. We use data on the SF express company to conduct this case study to test the model. In the case study, we represent a physical flight network so that link flows and node flows can be analyzed. Through the analysis of the calculation results we can draw the following conclusions: 1) With our network abstraction method, we can analyze the paths of cargos more exactly. 2) Cargos may be transshipped at some airports to reduce the transportation costs. 3) The bi-level model in this paper may be generalized to other fields, such as road transportation. In reality, the numbers of passenger flights are quite different in different time periods of the same day. In the future, we will study the express transportation cases in each time period of one day