| As the main artery of the national economy,the railway occupies an important position in China’s existing transportation system.With the continuous improvement of the quality of life,people’s requirements for railways have gradually increased.The term"high-speed railway" has become familiar to people,and the construction and development of high-speed railways in the world has gradually become a trend of railway development.The advantages of high speed,safety,convenience and comfort have been recognized by various countries.In recent years,China’s high-speed railway has achieved rapid development,and has become the country with the longest operating mileage,and gradually shows the characteristics of networked operation.Therefore,there is an urgent need for research on the utilization of EMUs under network conditions.In the view of this background,this paper do some related research on the utilization of EMU.First of all,this article recommends use periodic operation mode on the basis of combine the analysis of EMUs operational modes and maintenance system with the current situation of EMU operation under circumstances of high-speed rail network.The EMU adopts the periodic operation mode to improve the efficiency of the EMU.In addition,the analysis of the influencing related factors of the efficiency of the EMU lays the foundation for the modeling of the EMU scheduling optimization problem.Secondly,this paper transforms the EMU scheduling problem into a typical multiple traveling salesman problem(MTSP).Taking the minimum number of EMUs and the highest degree of equilibrium as the objective function.The constraint conditions include the connections of time and space,mileage-constrained maintenance and time-constrained maintenance.All the train running lines on the train running map are ed into nodes,and the connecting lines between the running lines are abstracted into paths,and develop multi-objective programming model based on periodic operation mode.Finally,this paper designs a genetic algorithm to solve the mathematical model above.In the design process,the initial solution is obtained by introducing the tabu search idea,and the genetic operator is improved to further optimize the solution.The fixed iteration number is used as the termination condition.Taking Beijing-Shanghai,Shanghai-Hangzhou and Nanjing-Hangzhou passenger dedicated line network as the research object,and the MATLAB software programming program is used to solve the optimization problem of the EMU.The obtained results are analyzed to verify the effectiveness of the model and algorithm. |
