Research On The Optimization Of The Train Diagram Of Express Freight On High-speed Railway

With the vigorous development of e-commerce,China’s express freight market shows great potential.The existing modes of transport organization,such as freight carried by passenger train,high-speed railway confirmation vehicle,and passenger and freight Cocompilation are difficult to meet the needs of freight development in the express market.With the rapid development and network operation of China’s high-speed railway,the transportation capacity of the high-speed railway network has been released.And it is possible to carry out the large-scale high-speed railway freight EMU special trains.Train diagram is a comprehensive plan for the train operation and a key technical document for the transportation organization.And it is also the basis theoretical for organizing the operation of large-scale high-speed railway freight EMU special trains.The traditional freight train diagram compilation method is difficult to meet the dynamic changes and timeliness requirements of high-speed railway freight market.Based on this,this thesis presents a "dynamic route selection" strategy for the train diagram considering the dynamic demand of the market from the perspective of the high-speed railway freight demand and the transportation mode of the high-speed railway freight EMU special trains.In this way,when there is a demand for the high-speed railway freight or freight product changes,the route can be selected directly from the set of running routes.It avoids the need to reformulation the train diagram after the freight demand changes,which fundamentally improves the ability of the high-speed railway to adapt to the dynamic changes of the freight market.The main contents of this thesis are as follows:(1)Analysis on the basic principle of train diagram compilation of high-speed railway express freight trains.Through the analysis of the transport organization of China’s high-speed railway express freight,the necessity of compiling the high-speed rail express freight train diagram is proposed.According to the characteristics of the compilation of the high-speed railway express freight train diagram,the key problems of train diagram are proposed.And focusing on this problem,the optimization ideas and key technologies for the compilation of train diagram considering the robustness of train line,the dynamic demands of the market,the EMU routing plan are proposed.(2)Departure time calculation model of high-speed railway express freight train.It is proposed that the interval of high-speed railway is regarded as interrelated multiple decision intervals in time order.The problem of calculating the departure time of high-speed freight EMU trains is transformed into a multi-interval decision problem.In order to meet the requirements of maintenance window,the train departure time model of the freight EMU special trains is established.And a heuristic algorithm is designed to solve the model.(3)Compilation and optimization model for train diagram of high-speed railway express freight transportation.Based on the departure time of each freight products,the maximize robustness of train diagram of the freight EMU,the minimize total running time of freight products and the minimize number of EMU maintenance are taken as the objectives.A compilation and optimization model for train diagram of high-speed railway express freight is established.And the heuristic search algorithm of ’dynamic route selection’ is designed to solve the problem.(4)Example analysis.Taking the Beijing west station to Guangzhou south station of Beijing to Guangzhou Railway as an example.The reasonable departure time of freight products such as ’the same day’,’the next morning’ and ’the next day ’ are calculated.Completed the compilation of 18 train lines for high-speed railway freight products.And the results show the feasibility of the model and the algorithm.