Train Traffic Optimization Scheme Of Urban Rail Transit Y-type Line Under Virtual Coupling Condition

With the rapid development of urban rail transit in China,multiple contradictions and conflicts between passenger transportation demand and line network capacity supply Increasingly,it has become a stubborn operational problem that restricts urban rail transit to exert its network efficiency and improve its service level.The virtual coupling technology uses wireless communication technology to replace the traditional mechanical coupling,which can realize real-time and fast recoupling or decoupling in the process of train operation.This technology has brought about an innovation in the operation organization mode,which can greatly improve the transportation capacity of the wire network.This paper proposes a new transportation organization mode for Y-type lines under virtual coupling technology,and builds an optimization model for the intersection scheme of Y-type lines.The main research work in this paper is as follows:(1)Research on the new transportation organization mode of urban rail trains under virtual coupling technology.First,the development background of virtual coupling and its transformative effect on the organizational model of train transportation are introduced.Then,the transportation organization mode of virtual coupling trains under the unbalanced passenger flow time distribution and the virtual coupling train transportation organization mode under the unbalanced passenger flow spatial distribution are respectively introduced.The decoupling/reconnecting operation process of several typical scenarios of Y-type lines is also introduced.(2)Analysis of Y-type line transportation organization mode under virtual coupling technology.This part first introduces the basic theory of Y-type line and the current situation of Y-type line construction in China,lists and analyzes a series of factors affecting Y-type line traffic planning.Then it introduces the transportation organization mode of Y-type line under virtual coupling technology,prescribing the operation rules of virtual coupling trains of Y-type line in this paper,and explaining its advantages.Finally,the line is divided into sections and the travel behavior of passengers on Y-type line in the new mode is analyzed in detail.(3)Construct an optimization model of Y-type line crossover scheme under virtual coupling technology and verify the validity of the model with a case.First,solve the optimal traffic scheme under the virtual coupling technology,and then select the indicators such as passenger waiting time,train travel kilometers,number of vehicles in use,maximum section full load rate,section average full load rate and other indicators.plans to compare.Finally,the sensitivity analysis is carried out on the frequency of train operation,the location of the branch line intersection and the turnaround station and the number of trains.It is concluded that the Y-type line interchange scheme under the virtual coupling technology has absolute advantages in passenger waiting time and train travel kilometers,and can achieve the effect of improving service level and reducing operating costs,but the full load rate index is different from traditional technology.Each scheme has advantages and disadvantages.26figures,12 tables,and 61 references.