Research On The Optimization Of EMU Rolling Stock Scheduling And Daily Maintenance Efficiency For High-Speed Railway

With the development of high-speed railway(HSR)network,China ’ s high-speed railway(CHSR)operation has entered a new development cycle,and railway transport organizations are facing a new situation of improving quality and efficiency.As a key factor restricting the efficiency of HSR transportation organization,the EMU rolling stock scheduling and maintenance are faced with challenges such as uneven distribution of EMU capacity resources and insufficient maintenance capacity of EMU depots.How to formulate reasonable and efficient EMU rolling stock scheduling and maintenance plan to support the improvement of HSR transportation efficiency has become an urgent problem for HSR transportation organization under the new situation.To solve this problem,this paper takes the development of HSR network as the background,and aims to optimize the efficiency of EMU rolling stock scheduling and daily maintenance operation.This paper puts forward the optimization strategies of EMU rolling stock scheduling and daily maintenance operation efficiency under the condition of HSR network from different perspectives.The optimization strategies of EMU rolling stock scheduling and daily maintenance operation efficiency under different application scenarios are studied in detail,mainly includes the following four aspects:(1)This paper reveals the internal relationship between EMU rolling stock scheduling efficiency and daily maintenance operation efficiency of HSR,and puts forward the optimization strategy of EMU rolling stock scheduling and daily maintenance operation efficiency under the condition of HSR network.Based on the current situation of CHSR network development,this paper starts from the definition and relationship between EMU rolling stock scheduling efficiency and daily maintenance operation efficiency,summarizes the new challenges faced by EMU rolling stock scheduling and maintenance plan,formulates the optimization strategy of EMU rolling stock scheduling and daily maintenance operation efficiency,and takes this as the breakthrough point to establish the main research content of the paper,which lays a theoretical foundation for the subsequent research on the optimization method of EMU rolling stock scheduling and maintenance operation efficiency.(2)An integrated optimization model of EMU rolling stock scheduling and flexible train formation based on passenger demand is constructed to optimize the rolling stock scheduling efficiency with fixed segment mode.Based on passenger demand,combined with the relationship between EMU train formation and EMU rolling stock scheduling plan,the concept of ’ flexible train formation by time period ’ is proposed,which links passenger demand with EMU rolling stock scheduling and train formation.On this basis,the factors such as turnaround and connection mode and train formation are considered,and the integrated optimization model of EMU rolling stock scheduling and flexible train formation based on passenger demand is constructed with the minimum direct and indirect costs of EMU rolling stock scheduling as the goal.Through the linearization of the model,the Gurobi solver is used to solve the model.Taking Beijing-Tianjin intercity HSR and its extension line as an example,the effectiveness and efficiency of the constructed model and solution method are verified.By comparing with the fixed train formation mode,it is found that flexible train formation mode can reduce the cost of EMU and improve the EMU rolling stock scheduling efficiency on the basis of meeting the needs of passengers.(3)An optimization model of EMU rolling stock scheduling plan with unfixed coupling/decoupling position based on variable train formation is constructed to optimize the rolling stock scheduling efficiency with unfixed segment mode.Based on the concept of variable train formation,this paper proposes a remarshalling method of ’unfixed coupling/decoupling position ’,which links the EMU rolling stock scheduling with train formation.Combined with the factors of train formation,first-level maintenance operation and connection mode,aiming at minimizing the acquisition cost,operation cost and first-level maintenance cost of EMU,an integrated optimization model of EMU rolling stock scheduling plan with unfixed coupling/decoupling position based on variable train formation is constructed,and a branch-and-price algorithm based on path search is designed to solve the model.Taking the high-speed railway transportation task of EMUs attached to Taiyuan EMU depot as an example,the validity of the constructed model and algorithm is verified.By comparing with the fixed coupling/decoupling position mode,it is found that the unfixed coupling/decoupling position mode can improve the EMU rolling stock scheduling efficiency.(4)The optimization model of EMU first-level maintenance operation plan based on flexible job-shop sequence scheduling is constructed to optimize the daily EMU first-level maintenance efficiency in EMU depot.Aiming at the current situation of heavy maintenance workload and low maintenance efficiency in EMU depot,a flexible job-shop sequence scheduling(Flexible-JSS)mode for the first-level maintenance is proposed.Taking the completion time of all first-level maintenance operations as the goal,considering the number of operation tracks,track capacity,operation sequence and rolling stock scheduling plan and other factors,an optimization model of EMU firstlevel maintenance operation plan based on Flexible-JSS is constructed.The improved genetic algorithm is used to solve the model.Taiyuan EMU depot is selected as an example to verify the effectiveness of the constructed model and algorithm.Through the comparative analysis of the fixed job-shop sequence mode and the one-section operation track mode,it is found that the Flexible-JSS and two-sections maintenance track mode can effectively improve the maintenance efficiency of the EMU depot,improve the utilization rate of the EMU depot track,reduce the operation completion time and improve the daily maintenance ability of the EMU depot.The optimization method proposed in this paper provides a theoretical basis for the optimization of EMU rolling stock scheduling and daily maintenance plan,and improves the theoretical system of rolling stock scheduling and maintenance optimization.The optimization strategies such as ’ flexible train formation by time period ’,’ unfixed coupling/decoupling position ’ and ’ flexible-JSS mode for first-level maintenance ’ break the traditional mode of EMU rolling stock scheduling and daily maintenance operation plan,and provide a new idea for the optimization of rolling stock scheduling and maintenance efficiency under the condition of HSR network,which has certain theoretical and practical guiding significance for realizing railway ’ cost reduction and efficiency increase ’.72 Figures,33 Tables and 133 Reference Literatures.