Research On Critical Technologies Of Line Planning And Development Of Computer-aided Decision System For High-speed Railways

Train service plan is the basis of working out train timetable, and its quality can directly affect the level of transportation service and the benefit of railway enterprises. Currently, railway management department in China is basically following the traditional mode by experiences for line planning. Therefore, it is a pressing need to improve optimization theories of line planning adapting to Chinese High-speed Railways(HSR). The critical technologies of line planning and computer-aided decision platform are researched in this thesis.Technologies and computer systems for line planning in domestic and foreign countries are summarized. And overall procedure of high-speed line planning in China is designed. According to the order of subprocedure, the overall procedure is divided into three stages, preparing work before planning, line planning and feedback adjustment after planning.In preparing work, transport modes are built firstly, according to passenger flow scheme, transport resource and railway network conditions. And based on different transport modes, generate potential line set, under human-computer interaction decision and optimization by mathematics models.Line planning is the core theories of the thesis, which contains two parts, one for initial plan generation, the other for plan interative optimization.(1)Initial plan generation. This process contains two steps, origination-destination trains building and train stop schedule making. With or without potential line pool input, analyse origination-destination trains building methods respectively, obtaining original and terminal stations, routes, compositons and other informations of operated trains. Through passenger flow assignment on train service network of origination-destination trains, arrange initial travel plans of passengers. Analysing non-stop and stop passenger flow between two stations, calculate train service frequency demand between the two stations. Set train stop styles possible, based on classification of stations, trains and origination-destination passenger flow in HSR network. According to train service frequency demand, decide frequency of non-stop trains, set frequency of stop trains and its combination plan properly, which is initial stop trains schedule.Assigning passenger flow on train service network of initial stop trains, generate initial train service plan under human-computer interaction according to passenger flow assignment result and remain train service demand.(2)Plan interative optimization. Using mathematics models or human-computer interaction or two ways combination, evaluate line plan when optimizating. Through passenger flow assignment to train service network repeatedly, adjust the plan according to realtime informations, for example passenger flow on train, travel plan of passenger, remain section density, until meeting the conditions for the termination of interative optimization or satisfying the plan. And the optimized plan is generated.In feedback adjustment, adjust the plan from the angle of matching relationships between plan and train schedule, transport resources and train service demand.Based on the critical technologies, computer-aided decision system is designed and developed using platform Visual Studio 2008. The system, window style adopted in the interface to users, is suit for line planning on the high-speed railway network. Line plan management, initial line plan generating and optimizating under human-computer interaction are realized by the system. The system can be the application platform of the line planning for HSR providing reliable decision support and basically meet the needs of high-speed railway transport planning.