Research On Configuration Optimization Of Departure Transport System For Railway Arriving Passengers

As China’s transportation infrastructure has experienced great development and prosperity in recent years, the construction of transport hub in major cities shows the trends of integration and large-scale. Railway passenger hubs, as important anchors in both railway-transport-networks and urban-transport-networks, are playing significant roles in passenger conversion between the two networks. Usually, a variety of urban transport means are gathered in railway hubs, undertaking passenger-distribution. However, often due to unreasonable planning, different modes of transport can neither be rationally allocated at their transport capacities, nor compete and corporate well, which cause traffic chaos in rail hub regional, and even make it an evident congestion area in urban traffic. One major reason is that the passengers’distribution transport can not operate efficiently.From the perspective of urban traffic, railway passenger distribution can be divided into two parts:arrival transport of departuring passengers and departure transport of arriving passengers. The configuration issue in both directions is a unified, complex and systematic problem. However, there is no relevant academic achievement that can fully and thoroughly reveal the traffic problem in this complex transport process. The reason may be that each mode of transport in the process is a relatively complete subsystem itself, whose configuration on both directions is affected by many factors, and the configuration of one subsystem will have an impact on the others’at the same time. Thus, the study of transportation system configuration in railway passenger transportation hub should be based on both the intensive study of arrival transport system, departure transport system as well as the influence between each other, but also the in-depth study of configuration of each subsystem as well as their interactions. Taking into account the complexity and scale of this problem and the impact of distribution traffic on urban traffic, this paper focuses on the departure transport system of arriving passengers.In this paper, the feedback loop configuration optimization of railway station arriving passengers’departure transport system is studied. From the perspective of railway passenger hub, in order to improve the operational efficiency, to allocate resources of railway departure transport system rationally, and to relieve traffic stress of the hub area, this paper considers the affect between traffic structure optimization and traffic configuration optimization, which was ignored by the recent researchers. The main contents are summarized as follows:1. On the basis of combing the railway passenger hub functions in both railway passenger transport and urban transport, we discuss the reasons for railway arriving passengers’departure transport problem, which are mainly in three aspects:inadequate departure transport system capacity, irrational departure transport structure, and unreasonable departure transport system configuration. Through the analysis and synthesis of the literature, we indicate that the configuration of railway arriving passengers’departure transport system should be optimized by both taking full account of competition and cooperation between the different modes of transportation and achieving a feedback between system configuration and transport mode selection by taking the level of service as a link, which are on the basis of revealing arriving passengers’departure transport mode selection mechanism.2. By analyzing the departure transport process and content of departure transportation system, we find that the system has similar features with "symbiosis", and then present the definition of arriving passengers’departure transport system. According to the definition of the system, we propose that departure transport problem can be transformed into a problem to improve traffic efficiency or to shorten arriving passengers’departure time. To reflect the interaction between the arriving passengers’departure transport structure optimization and the system configurations optimization, a traffic information feedback mechanism is proposed, in which the entire transportation system optimization process can be linked together by transport information. On the basis mentioned above, a loop optimization mechanism of departure transport system configuration is proposed.3. On the basis of analyzing arriving passengers’departure transport mode selection mechanism, utility function of departure transport mode selection model is improved by introducing the service level expectations index, and then a NL model is established for a departure transport system which constitutes of such modes as normal bus, urban rail, taxi and private car, in order to solve the problem that traffic characteristics between railway passengers and urban travelers are not entirely consistent when predicting mode selection.4. A headway optimization model of the departure public transport system is established in order to, which aims to minimize the weighted sum of system operating cost and the traffic influence, constrainted by the NL model to optimize the departure transport construction to meet the level of service (LOS) condition. The model is built to solve the problem that the feedback is ignored between the configuration of departure public transport system and the optimization of departure transport mode selection.5. A desk-number optimization model for the departure taxi transport asynchronous single vacation queuing system is established, which takes the desk number as the decision variable and aims to minimize the weighted sum of system operating cost and the traffic influence, taking the NL model as the constraint conditions in order to optimize the departure transport construction to meet the LOS condition. The model is built to solve the problem that only single desk systems are considered in recent queuing system researches in departure taxi system of railway passenger hub, and that the feedback is ignored between the configuration of departure taxi transport queueing system and the optimization of departure transport mode selection.6. A configuration optimization model of departure transport system for railway arriving passengers is established, which aims to minimize the weighted sum of system contribution cost and the waiting time cost of passengers, constrainted by the NL model aiming to optimize the departure transport construction to meet the LOS condition. This model is built to achieve both capacity configurations for all transport modes from the perspective of the best overall system, but also the feedback loop optimization between traffic structure and system configuration; besides, the comparative analysis of the numerical example results between this chapter and the past 2 chapters shows that we also solved the problem that configure optimization of single transport mode is lack of considering the competition and cooperation within different modes.