Research On Capacity Coordination Of Station And Line Based On Railway Freight Transportation Operation Process

With the leapfrog development of Chinese railway and the great variation of transportation demand in structure and scale, capacity coordination of railway station and line has become a vital and urgent problem. As railway is a complex and dynamic system with all the sub-systems connecting closely to each other, it is far from practical need to simply measure capacity coordination of railway stations and lines by theoretical capacity or projected capacity. However, it is very important and desired to do that by the real capacity load and interation between adjacent stations and lines caused by the railway freight transportation operation process to provide feasible and effective theory and technology to improve the capacity coordinating situation of railway station and line as well as to enhance the integrated efficiency of railway system.Railway freight transportation operation process consist of several processes belonging to two logical layers, and upon that this thesis explores the capacity coordinating problem of railway station and line based on the two key processes of different layers, namely the processes of car flow routing operation and marshalling station operation, focusing on the following contents:(1) The hierarchy of railway freight transportation operation process is defined by the basic idea of hierarchical network analyzing frame, and the critical roles of the key processes above mentioned and the incidence relations between the key processes and others are clarified to lay a foundation for other research content of the thesis.(2) On the basis of summarizing and refining the existing research results related to capacity coordinating problem of railway station and line, the connotation and important characteristics of capacity coordination of railway station and line based on railway freight transportation operation process are systematically explained, and the criterion and its determining tactic is discussed.(3) In line with the analysis on the capacity coordinating problem based on the car flow routing, the problem are decomposed into two sub-problems, i.e. Line-Capacitiy-Constrained and Load-Balanced Car Flow Routing Plan Problem (LLP) and Node-Line-Capacity-Constrained and Load-Balanced Car Flow Routing Plan Problem (NLLP). Two multi-objective models minimizing the transportation cost and rationalizing the capacity load are respectively constructed, and then some corresponding solution strategies are proposed based on the k-shortest route algorithm and Lagrangian relaxation algorithm. The effectiveness of those models and solution strategies are verified, and meanwhile the effect of car flow routing on the capacity coordination of railway stations and lines is delved.(4) Due to the appropriate allocation of operating elements in marshalling station being a prime condition to realize capacity coordination between marshalling station and its adjacent line, a Time-Slice Capacity Coordination Evaluation Method for Marshalling Station and the evaluating criterion are presented based on the time-slice car flow balancing equation and workload calculating method for marshalling station. Declassification simulation system and departure simulation system are developed subjecting to the evaluation method, and then the effect of different allocation program on the capacity coordination of station and line is analyzed by the a dozen times of simulation experiment to provide technical guidance for optimizing allocation of operation elements in marshalling station oriented to capacity coordination of railway station and line.