Research On Optimizing The Setting Of Maintenance Time Window In Train Working Diagram

Railway is the backbone of my country’s comprehensive transportation system,and it has the highest status and role in economic and social development.The railway train chart is the general program of all railway production plans and production activities.As my country gradually moves toward a leading modern railway power,the level of railway product supply,transportation safety,modern governance capabilities,technological innovation capabilities,railway service quality,and the efficiency and comprehensiveness of the compilation of train diagrams have become a new aspect of railway transportation organization.test.Therefore,in-depth basic theoretical research,improving the efficiency of working diagram compilation,ensuring the safe and effective of maintenance time window,and improving the level of railway intelligence are important tasks for the current transportation organization.Based on the full analysis of the existing research results at home and abroad,this article focuses on the long operating mileage of dual-track electrified railways in China,the complex types of trains on existing lines,the co-line operation of trains of different grades and different speeds,and the compilation of train operation diagrams.The situation of mixed freight trains;in the preparation of the maintenance time window plan,it is considered that different vehicles have different requirements for track and line infrastructure.There are many types of maintenance operations in the comprehensive maintenance time window,and the speed limit operation conditions of the trains after different maintenance time operations are different.After the issue of the unequal release speeds of different grades of trains,research has been carried out around the train working diagram and integrated compilation.The main research work is as follows:(1)Firstly,the contents of the train working diagram and the comprehensive maintenance time window plan are sorted out,the relationship between the train working diagram and the comprehensive maintenance time window is clarified,the train working diagram preparation process is analyzed in detail,and the suitable for my country’s double-track electrified railway Comprehensive maintenance time window opening method.Then it analyzes the influence of factors such as train operation organization method,train operation line layout,partition setting of time window,station storage capacity,railway transportation cost and other factors on time window installation,and analyzes the complexity of maintenance time window installation.(2)Construct a nonlinear mixed integer programming model for the integrated compilation of train working diagrams and maintenance time window.Taking the minimum total travel time of all trains in the planned time period,the most densely arranged train working diagrams,and the minimum waiting time of trains at stations as the objective function,comprehensive consideration of train speed constraints,tracking train interval time constraints,station operating time constraints,and maintenance time window constraints And the allowable number of stops;on this basis,focus on the analysis of the impact of station storage capacity on train operation diagrams and maintenance time window,that is,the number of arrivals and departures occupied by certain types of trains at any station in the road network at any time cannot be greater than The number of arrival and departure lines used to receive and dispatch this type of train at this station.In summary,an integrated compilation model of train working diagram and maintenance sunroof is constructed taking into account the constraints of the departure route.(3)On the basis of analyzing the complexity of the integrated compilation model of train working diagram and time window,focus on comparing the scale and difficulty of solving the problem with row generation algorithm and row generation algorithm,and choose row generation algorithm to solve the train working diagram and maintain the time window.Develop the model.First,aiming at the nonlinear problem of the arrival and departure line constraints in the integrated compilation model of train working diagram and time window,linearize the arrival and departure line constraints,and establish the corresponding relationship between the line generation algorithm and the integration problem of train working diagram and maintenance time window.Using the line generation algorithm to decompose the integrated compilation model of train working diagram and time window,the main problem and sub-problems of the restriction after model decomposition are obtained.Finally,the specific solution process of the integrated compilation of train working diagram and maintenance time window problem using the line generation algorithm is given.And design a simple case to verify the correctness of the model construction.Based on the Python+ Gurobi solution environment,design a large-scale case to verify the effectiveness of the algorithm using the Tianshui-Lanzhou section of the Longhai Line as an example.The above research analyzes the influence of the opening of comprehensive maintenance time window on the passing capacity of railway sections and the compilation of train working diagrams,which can lay a theoretical foundation for the study of the integration of train working diagrams and maintenance time window;at the same time,the integration of railway train working diagrams and maintenance time window in our country The design and development of the decision support system for the establishment of a chemical system also has a certain reference value.