Research On Coordination Analysis Of High-speed Railway Point Line System Capability

China is forming a high-speed railway network with the main channel as the skeleton,the regional connection line connected,and the inter-city railway supplemented.However,China's railway transportation capacity is still in a state of shortage at this stage,which cannot fully meet the long-distance travel demand promoted by the people's economic growth.The points and lines of the high-speed railway transportation system have organic links under the influence of different internal and external factors,but in some places there are conflicts that restrict the development of high-speed railway transportation.In order to ensure efficient transportation operations and improve the comprehensive capability of high-speed railways,the level of coordination of high-speed railway points and lines should be improved.Therefore,this paper analyzes the coordination problem of high-speed railway point-line capability from two aspects of point system and point-line composite system.According to the research results,it is the focus of research to analyze the factors that limit the coordination of high-speed railway point-line capacity and propose improvement measures for these factors.Firstly,analyze the background and significance of the coordination problem of high-speed railway point-line capacity,and expounds the research status of domestic and foreign scholars on this issue from three aspects:high-speed railway transportation capacity,high-speed railway point line capacity coordination and high-speed railway transportation organization.Summarize the shortcomings of the current research results,and put forward the main problems to be solved in this paper.Summarize the structure of high-speed railway capability system,expound the theoretical knowledge of the connotation of high-speed railway line-line capability coordination,and focus on the main research method selected in this paper:stochastic petri net theory.Then,combined with the technical operation content of the high-speed railway station,the technical operation of the high-speed railway station is divided into 4 parts:the initial passenger train station operation subsystem,the final passenger train station operation subsystem,the stop station through the passenger train station operation subsystem,and the present reentry passenger train station operation subsystem.The workflow diagrams of these four subsystems are drawn respectively.The petri net model is established according to the flow chart,and the validity of the model is verified by three methods:accessibility,activity and boundedness.According to the petri net model,construct the corresponding Markov chain,and combining this Markov chain,the corresponding equations for calculating the steady state probability are listed.Combining the characteristics of the column flow and operation of a station on the Beijing-Shanghai high-speed railway,calculate the implementation rate of each change.Thus,the busy probability of the library,the probability of the library being idle,and the busy probability of the system equipment are obtained.Finally,the coordination degree of the point system is calculated according to the busy probability of the four subsystems.According to the calculation results,the factors leading to the busy line and throat are analyzed,and the countermeasures for the coordination level between the equipment of the enhanced point system are proposed based on the calculation result of the coordination degree.Finally,based on the concept of high-speed railway point-and-line composite system,the DEA-based high-speed railway point-and-line composite system coordination degree model is established.Taking the Beijing-Shanghai high-speed railway point-line composite system as the analysis object,each time period from 6 o'clock to 24 o'clock is the decision-making unit.The selected point system indicators are:the number of lines available for the Beijing-Shanghai line,the number of lines occupied by the Beijing-Shanghai train,and the proportion of the total number of trains occupied by the Beijing-Shanghai train;the selected line system indicators are:different speeds The proportion of the class train,the total number of stops,the sum of the stop time,and the total travel time.The point system and the line system are respectively used as input and output systems of each other,and the DEA method is combined with the deap2.1 software to obtain the DEA result and the system efficiency evaluation result,calculate the coordination degree of the point line composite system,and the point line composite system.And the coordination degree of the point line composite system and the scale efficiency of the system are analyzed.Analyze point system and line system calculation results separately.According to the calculation results of the point system,the coordination degree of the station to the hairline and the throat device is in a good coordination state and a basic coordination state,respectively.And the technical inspection on the hairline,the water on the train,and the probability of passengers boarding and dropping are relatively high;From the calculation results of the point-and-line composite system,it can be seen that from 6:00 to 9:00 am and from 20:00 to 24:00 in the evening,the EMU is in a busy storage and storage stage,and the coordination degree of the point-line composite system is not high,and the degree of coordination is combined.The low decision-making unit analyzes the factors affecting the coordination of the point-line composite system,and proposes corresponding countermeasures for the problem.