Research And Practice For An Automatic Fare Collection Clearing Central System Of Rail Transit Network

With fast development of rail transit, coupling degree among lines of city rail transit network would be higher and higher, and interchanging among lines is becoming frequence more and more. Due to high investment, long work period and etc. of rail transit construction, different main body of business operation and profit would be concerned in rail transit construction and business operation. An automatic fare collection (referred as AFC below) clearing central (referred as ACC below) system of rail transit network is the core of the entire rail transit system that is usually located on the top of the rail transit network. It is charged with more tasks such as management, profit allotment, clearing with outside system and etc. of the AFC system of the entire rail transit network. Hereby, research for ACC system of rail transit network has a quite important significance.Through making definitude of the functions for ACC system of rail transit network first, its architecture pattern, reference model and reference architecture have been designed by using of the idea of layer and grouping in this thesis, and the software architecture and its implement method have been also described for ACC system of rail transit network.The main reaserch work of the author in this thesis is as the followings:(1) An idea and its algorithm for simplified modeling of rail transit network have been researched and practiced, in which repairing overlap edges, identifying edges with common stations and the method for replacing back of keyless nodes in the simplified modeling are also included.(2) Research and compare on the methods to calculate the K^th shortest path by using of "based on the shortest path and its deviation Path" and "based on the shortest path and deleting its adjacent edge". (3) Describe the method to generate clearing rates among different lines' stations by using K(≤3) shortest path between different lines' stations.(4) Describe the technique and approach in which a main memory database is applied to an ACC system of rail transit network in order to enhance the process efficiency in real time and to reduce I/O frequency.The studied results described in this thesis can be expediently applied to the technical implementation of an ACC system for multi-lines of city rail transit network and have good reference and practical values. The practice in this thesis made by author is opened out base on the topology structure of related lines and stations, and its data of the actual operation rail transit network in Shanghai at present.