Stopping Schedule Optimization Of Express/Local Train In Urban Rail Transit Based On Station Classification

The constant evolution of the development form about urban and the continual extension of spatial structure,makes the outer suburb be broaden to satellite towns,the city from single center turn into multi-center.The traffic demand in the corridor linked with satellite towns and central regions increased unceasingly,it makes temporal and spatial distribution of passengers become more diverse.The turn tide of satellite city puts forward new requirements to the development of urban rail transit system,it needs provide the passengers service not only the capability turn into "big",and all service speed into "fast".Urban rail transit not only must solve the traffic jam problem which has big capacity and high density in an inner-city,but also the convenient travel problem which has middle capacity and long distance between the outskirt.Therefore,the express/local train system via offering the faster service to residents travel become the more travel path and becomes a key development direction of relative studies in urban rail transit.After the station classification,the main works and research conclusions of this paper based on the previous theories and applications of the express/local train system in homeland and abroad are stated as follows:(1)Related issues for the express/local train were outlined,the concept,advantages and disadvantages it was implemented and benefit were elaborated,and the necessity and feasibility also be analyzed.And then the key factors affecting the express/local train operation were analyzed and expounded such as station dwell time,additional time of start-stop,headway,operation structure of express/local train,over-taking modes,and so on.(2)The main properties of station classification were set up includes 5 target such as passenger volume of get on-off in peak hours,number of convergence direction,public location,evacuation capacity,complex network indicators.Then,the multi-attribute error-eliminating sorting method was adopted to classify the stations and the process of grading methods were described includes 6 tidbits i.e.the basic data analysis?error value calculation of classification attribute?limit error loss value calculation of classification attribute?determination of error loss sequence?aggregation value calculation of station classification?station classification based on the SPSS-cluster analysis.(3)According to the grading results and the analysis on total passenger travel time savings and operating earnings of operating enterprise,stop sequence and operation frequency of express/local train as the decision variables,the most total travel time saving and maximize profits of transportation enterprise as optimization objective,and with the constraint of operation conditions of express operation condition express,train load factors and passenger flow coordination of express/local train,passenger direct features,and through capacity and so on,the optimization model about stop sequence of express/local train was built based on the station grading,and the implement illustration of algorithm was described in detail.(4)Taken the metro line X in a certain city as the object,it conduct the station classification and stop scheme optimization,numerical example results shown that:(1)Compared to the optimization results based on unrated station,the optimization stop scheme can cover all important station,in addition,due to the optimization stop scheme considering the station classification takes into account the technical foundation of stations conditions and network function,it will guide the specific implementation about express/local train operation more conducive.Nonetheless,compared to the optimization results based on unrated station,although lead to increasing to some extent of total passenger travel time,but caused the reduce of enterprise cost,it also brought more corporate earnings increase.(2)According to the sensitivity analysis about the price of a ticket,when the express passenger fares increase constantly by 0.25 yuan to 0.50 yuan,the fitness value first rise and then drop.Corporate earnings first rise and then drop,this is due to the express train keeping a certain amount of passenger flow increased the enterprise passenger fares when the fares preliminary growth,and with the ticket prices rise again,due to the rapid loss of express passenger flow,enterprise profits down again,and determined the optimal express ticket rate was 0.30 yuan per mile on this line.The total travel time is characterized by sustained growth mainly due to the fares growth to the express train will lead to the express passenger flow down to the local train.The passenger coordination coefficient first drop and then rise mainly due to the fares growth to the express train will lead to the express passenger flow first down to suitable volume,then for capacity,reduce traffic coordination coefficient,and then with the persistent loss of express passenger flow,so as to make the carrying passenger flow increased higher on local train,passenger coordination coefficient increases again.Therefore,used the economic leverage of express ticket can obtain the traffic control to a certain extent based on the state of passenger coordination coefficient in the concrete express/local train operation in order to realize the better passenger balance between the express and local train.