Characterization And Assessment Of Transportation Situation In Railway Marshalling Station

As the "processing factory" for freight trains,marshalling station is an important part of the railway transportation industry.It undertakes the classification and marshalling task of a large number of freight trains in the railway network.In recent years,affected by the gradual construction of high-speed railways and the policy of "Road to Railway",the traditional method of traffic dispatching control of marshalling stations is difficult to adapt to the changing railway transportation system.At the same time,with the continuous advancement of the railway intelligentization,it is necessary to continuously improve the intelligent technology level of the marshalling yard.In order to efficiently carry out the traffic control work of the marshalling station,improve the intelligent level of the operation organization of the marshalling station,and comprehensively grasp the working status of the marshalling station transportation organization,based on the basic theoretical knowledge of marshalling station,and with the situation theory combined,this thesis carries out the characterization and assessment of marshalling station transportation situation.The following studies were mainly conducted:Firstly,the transportation situation of railway marshalling station was defined,and its connotation and composition were analyzed.According to the existing situation research,the concepts of transportation situation and railway marshalling station transportation situation were given.The specific connotation of the marshalling station transportation situation was analyzed.By summarizing the main technical operations of the marshalling station and analyzing the relationship between the operations,combined with the characteristics of the series connection of the train flow between the operations,the transportation situation of the marshalling station was divided into five subsystems: arrival,classification,assembly,marshalling,and departure transportation situation,and the transportation situation between subsystems.And from the perspective of train flow input-operation itself-train flow output,the constituent elements of the transportation situation of each subsystem were extracted.Next,the railway marshalling station transportation situation characterization system was constructed,and the characterization indicators were quantified.The constituent elements were concretized to select and analyze 18 transportation situation characterization indicators,and each index was mathematically quantified.At the same time,the reference pros and cons of index values were delineated in combination with relevant research.The railway marshalling station transportation situation characterization index system was established.Finally,an assessment model of marshalling station transportation situation was established and an example analysis was carried out.Using the comprehensive weighting method combining the Order Relationship Analysis method and the Entropy Weight method.The marshalling station transportation situation combining the SPA-TOPSIS method and the Cosine Similarity was constructed from the relative distance and relative trend.Based on the transportation data of the Chengdu North marshalling station,a calculation example was constructed to evaluate the transportation situation of the marshalling station in 12 moments of one certain day,the relative distance data and cosine similarity data results and ranking of each time period were obtained,and the evaluation results were analyzed.Compared with the traditional entropy weight TOPSIS method,the effectiveness and sensitivity of the improved evaluation method were verified.