Study On The Optimization Model And Application Of Urban Rail Transit

After 30 years of reform and opening-up,great changes have taken place in China's economic and social features turn the world upside down.The achievements of economic development,transportation development is more advanced,the achievements are also very beautiful gratifying.Even so,city traffic situation is still far behind the reality needs,especially in city traffic network planning and construction etc.along with the rapid development of economy,city construction has been accelerated,the enlargement of city scale,more and more large population gathered to the city,the number of motor vehicles increased exponentially,traffic congestion,environmental pollution and high energy consumption enterprises of city disease is becoming very serious.Because the city rail traffic carrying a large amount of energy,low consumption,high transport efficiency,environmental friendly and other unique advantages,the main direction of development has become an important means to solve the traffic problems of public traffic problems of domestic city and the future of the city.Firstly,analysis of existing train routing in urban rail transit and its characteristics,on the basis of this,focusing on urban rail transit train in AC mode the train plan,passenger travel time costs and operating costs of the transportation enterprise is calculated.Analysis of passenger travel costs,taking into account not only the average waiting time for passengers on the platform,and for upstream and downstream flows are starting from the passenger station and ending at the station to categorize passenger flow,detailed study of the different categories of passenger travel time and waiting times at stop of the train during the journey,and as a basis for the calculation of passenger time costs.Analysis of operating costs,mainly on the purchase cost of the vehicle and the fee for the use of the train.After careful consideration of the passengers 'travel time costs and urban rail transport enterprises ' operating costs,establish the cost minimizing objectives mentioned above,line capacity,passenger demand constraint model,in order to achieve routing optimization scheme of urban mass transit train and better train plan.As the model for non-linear models,and belong to a mixed-integer programming,target multiple and difficult to solve.For easier solution,using the interests of passangers attention-weighted method,the original models of diversity goals into a single goal,and the use of appropriate algorithms,solving by means of software.As examples,model.Examples based on also the turn-section passenger station and pay a small road and passengers interests focus on factors such as the sensitivity analysis.Study finds small cross road turn stand selection and cost implications are obvious,small road section the higher the proportion of passenger flow,routing plan more beneficial to reduce travel time costs and business operating costs;firms are more concerned about the interests of passengers,company higher operating costs,but there is a simple linear relationship.Based on the above findings,discusses the beginning of Chongqing light rail line Line 1,the current and long-term optimization of routing plan.