Study On Evaluation And Optimization Of Service Ability Of Pedestrian Facilities In Transportation Hub

To promote the construction of the transportation hub, it has a positive practical significance in improving the service level of public transit system, and optimizing the overall layout of city space. In the process of building a transportation hub in some city has the following problems:on the one hand are the poor coordination and the low efficiency in the pedestrian facilities in the existing transportation hub. It is lack of the analysis of evaluation and optimization based on the characteristic of passenger flow. On the other hand is configuring the number and the scale of pedestrian facilities to apply the passenger flow peak prediction in the planning year for designing the new transportation hub. Therefore, there is a very important significance that how to scientific and rational guide the configuration of pedestrian facilities in the transportation hub.At the first, this paper study on the basic characteristics of pedestrian walking in the transportation hub.(1)For the pedestrian connection facilities, this paper fits relationship between flow-density, velocity-density.(2)For the pedestrian service facilities use MMC queuing model when in the non-peak of passenger arrival rate and use the method of trigonometric approximation when in the peak of passenger arrival rate to analyses the delay time and the number of queues.Secondly, this paper using the knowledge of graph theory to abstract the transportation hub and using delay time to describe the road impedance and node impedance. The introduction of the streamline for the whole process in the transportation hub, it is based on traffic demand of the whole hub network. By analysis the OD requirements of path and the corresponding to the cost of path time under the current condition one by one, and establish the game payoff matrix of different passenger flow assignment and the cost of path time. On the basis of solving the game payoff matrix is the passenger flow distribution ratio in OD.Thirdly, this paper proposed the concept of adaptability of pedestrian facilities to evaluate the service level of pedestrian facilities in the current passenger flow distribution results, and this paper use Particle Swarm Optimization to get the optimal configuration of pedestrian service facilities, on the other hand this paper uses the general optimization method in pedestrian connection facilities, in order to optimize targeted the bottleneck pedestrian facilities, which is a low degree of adaptability.Finally, this paper takes the Beijing JianGuoMen subway station to collect the actual traffic demand as example, then using the algorithm of the passenger flow streamline of the whole process to complete the assignment of passenger flow. Through the comparison with the actual situation of passenger flow distribution in corresponding transportation hub, the algorithm of assignment of passenger flow is in higher consistency. In the current passenger flow distribution, it can calculate the adaptability of pedestrian facilities. At the same time, it can targeted optimize the low degree adaptability of pedestrian facilities, and the simulation shows that,before and after optimization, the method can be used to guide the configuration of the pedestrian facilities in the transportation hub and can provide reasonable reference for transportation management.