Optimization Study On Train Formation Scheme Of Urban Rail Transit

Recently, with the rapid urbanization and the healthy economical condition, china’s urban rail transit is in rapid exertion. How to ascertain the train formation scheme of urban rail transit reasonably is a key problem no matter it’s in the stage of planning or in the stage of practical operation, because it enables to lower the project building expense and operation cost, and can optimize transportation operation as well as service.As the scale of the urban rail transit increases, so does the disproportion of passenger flow. New ways of operating for this disproportion has not been developed perfectly, particularly in hybrid operation of multiple train formations scheme. This study has analyzed train formation scheme and took a real line as an analysis case after built models for operation of singleness train formation scheme and hybrid operation of multiple train formations scheme respectively.The train formation scheme was classified and analyzed. This study did analysis discussion about the related influencing factors, such as passenger flow, urban rail transit vehicle, infrastructure, the social and economical benefits, service level, etc. Followed by the component analysis of passenger travel cost and company operation cost, two multi-objective integer programming models to optimize singleness train formation scheme and multiple train formations scheme were established based on the restriction of the train operation frequency and passenger traffic demand, with minimal cost considered passenger travel cost and company operation cost. Based on linear weighted method, Chongqing rail transit line6is analyzed to get the optimal solution in operation of singleness train formation scheme in planning periods with MATLAB software tool. From the point of purchase cost of vehicle and vehicle allocation, this study suggested and quantitative calculated the hybrid operation of multiple train formations scheme in the near future, considering of enterprises benefits and passenger’s interest. The simulation result showed that multiple train formations scheme can achieve a better optimization on the unbalanced passenger volume line, with passenger travel cost, company operation cost, combining cost decreased by2.29,34.51,10.31percent respectively. The results verify the validity of model and demonstrate the advantages of multiple train formations scheme.