| At present,the operating mileage of China’s railway,especially the high-speed railway,is growing,the topological structure of the road network is becoming more and more complex,and the difficulty of railway transportation organization is gradually increasing.On the one hand,as one of the key documents to command the railway transportation organization,the preparation of passenger train operation scheme is also the key to affect the efficiency of railway transportation organization,so the problem of passenger train operation scheme needs to be further studied.On the other hand,China’s railway is often affected by emergencies in operation.In order to ensure the normal operation of railway transportation organization in emergencies,the optimization of passenger train operation scheme is studied.The main work is as follows:Firstly,the definition of operation scheme and vulnerability evaluation method of railway network are described.Firstly,it defines the definition,basic characteristics and classification of train operation scheme;Secondly,the vulnerability evaluation method of passenger train network nodes is elaborated in detail.The vulnerability evaluation method of power grid is optimized to that of railway network nodes,and then the classification methods of nodes of different passenger stations are obtained;Thirdly,the principle of train operation between nodes of passenger train network is elaborated,and the initial principle of train operation scheme based on node vulnerability is obtained.Secondly,the paper analyzes the problem of train operation scheme based on node vulnerability in detail,and makes different analysis on the impact of different nodes under the macro conditions.Then,based on the node classification of vulnerability,it puts forward specific measures for different types of nodes after being affected.On the one hand,the paper analyzes the complexity and feasibility of the train operation scheme based on node vulnerability,and demonstrates its feasibility for the design of passenger train operation scheme based on node vulnerability.On the other hand,through the in-depth study of the starting and ending point,operation section,operation number,operation type and stop scheme of the train,the paper gives the design method of operation scheme from the service frequency of passenger train,operation section division of passenger train,stop type and operation pair of passenger train.Based on the above analysis,the passenger train stop scheme is designed according to the vulnerability index and train service frequency,and the principle of train operation scheme is considered.In order to minimize the service frequency deviation and maximize the vulnerability index,a vulnerability based train operation scheme model is established.The model variables,constants,objective functions and constraints are discussed in detail.Then,combined with the characteristics of the model,the coding method and selection operator of the traditional genetic algorithm are improved,the improved genetic algorithm is designed,and the specific steps and program block diagram of the algorithm are given.Finally,we design the method and steps to solve the model.Taking a passenger line as an example,we use the algorithm and model to optimize the operation scheme,verify the effectiveness and efficiency of the model,and analyze the effectiveness of the algorithm of the example.Through the research on the train operation scheme of node vulnerability,we can find out the weak links in the railway network,provide decision-making basis for the future railway network planning and transformation,in order to ensure that the railway network can maintain good accessibility and smoothness in the future development planning,and provide decision support for the preparation of passenger train operation scheme. |
