Research On Train Operation Oriented Modeling And Simulation Method

In the last years, Chinese railway has achieved great development, and the transportation organization pattern has been changing from "dispatching-based" to "planning-based". At the same time, many high-speed railway passenger dedicated line, will be operational in the future and the corresponding transportation organization pattern is also intensely carried out. Planning optimization is the key issue of railway operations, driving organization pattern of reform and development in the optimization objectives, constraints, sophistication, security, reliability and timeliness requirements, and other aspects for the railway traffic organizational plan to a new connotation. Organization pattern and the corresponding plans based scheduling method, technology and application make a series of higher new requirements of the railway transportation organization simulation.In this new context, we believe that the simulation aiming at transportation organization pattern has been mentioned on the agenda. The modeling and simulating decision-making process and methods, will provide strong support for research on the optimization and reliability of the traffic organizational plan, and analysis and organization of the new traffic patterns. Railway traffic organization pattern-oriented simulation will change dramatically in the systematic, complexity, intelligence, and the scale of operation, while the environmental adaptability requirements will be greatly improved. Therefore, this study will mainly face difficulties in two areas, the first is collaborative and evolutional simulation modeling methods which is focused on railway transportation organization intelligent decision-making activities, and the other one is simulation system constructing methods with high reusability and adaptability Simulations of the railway traffic organization in the past treat corresponding plans as output data. So, they are just the assessment of some scheduling results of the decision-making process. The corresponding research methods can not be used to solve the two difficult issues mentioned above, that means we have to explore new efficient ways.In this dissertation, we take complex adaptive systems theory as the theoretical basis for the study of development of railway transportation system, and unify modeling and system constructing on the basis. For such a complex scheduling issue, we realize the entire decision-making process based on the use of method of dividing collaborative tasks multi-agent modeling method, which divides the issue of the decision-making in the system of plans into multiple sub-tasks, and distributes to a number of decision-making entities, through independent interaction and decision-making process. The use of collaborative activities emerging from individual interactions, can naturally perform decision-making process under different traffic organization to support of evolution. Constructing simulation system in the context of the evolution, the dissertation on integrated simulation, uses the advantages of SOI loosely coupled way to coarse-grained support system processes to facilitate the reorganization and optimization, is based on the research results of advanced simulation technology in the HLA representatives, with SOA Simulation of the ideological framework to achieve integration between different levels of the unit interoperability and reuse, the protection system to explore the development of efficient and adaptive way. In this study procedure, the dissertation is organized as follows:1) According to the complexity and adaptability of the railway traffic organization, we presented a railway transportation organization simulation application method based on the structure model, the cell model and simulation integration. We also established the field - oriented modeling and simulation framework based on the systemic evolution of the railway traffic organization, which can achieve the evolution of the organization from the different levels of the simulation system, to meet the simulation research requirements of the traffic patterns in the context of changes.2) We presented a modeling method to realize the railway organization optimization via distributed transport entities and resource entities in self-decision making way. We studied the modeling method based on the decomposition of collaborative tasks and constructed multi-agent based railway transportation organization system framework. "Transport stream" and "transportation resources and resource management" model are treated as the two key points to realize plan scheduling through the collaborations among multi agents. That is to vehicular traffic Union in the form of traffic flow through the collaboration between the grouping to obtain reasonable program on the question of traffic flow modeling; subsequent alliance with the traffic stream train network described in the mission planning for the collaborative relationship and the establishment of the Union the main traffic flow and traffic flow for collaboration among the main model for different transport resources to achieve collaboration trains tasks, to put forward transport resource allocation methods based on the "compensation" synergy. 3) Under a multi-level integration simulation demand of railway traffic organizations, the dissertation introduces the services-based idea to achieve loosely coupled integration of coarse-grained simulation of integrated modules, proposes railway traffic simulation integration organization mechanism combined with HLA norms, and builds Simulation Integration Framework structure based on MAS. On the basis of simulation integration framework, combination of rail travel organizations simulation common areas, it builds simulation support environment which is based on the three levels of support functions.4) Based on the above studies, the dissertation combines the applications of assembly simulation of network truck, establishes a multi-level evaluation simulation model aimed at truck assembly strategy which is pointing assembly and assembly, gives the macro simulation assessment arithmetic, designs the corresponding simulation system, and analyzes the methods of examples.This dissertation studies the organization of the railway traffic-oriented simulation modeling methods, in the text of the framework for modeling and simulation, simulation modeling method and system integration methods help to solve the difficult problem of rail traffic simulation applied research organization in the context of the new development, to support demands of study of railway traffic organization which the changes adapt to the changes of outside world.