Modeling And Simulation Of Pedestrian Flow Movement In Urban Rail Transit

The law and basic characteristics of pedestrian flow movement in rail transit are closely related to rail transit construction and operation. With China's large-scale rail transit construction and expansion of operation, the safety and organization of mass and high-density pedestrian flow movement in rail transit is worthy of attention. As the pedestrian flow is a complex movement form, whether or not the organization in rail transit environment is reasonable, it is related to the pedestrian flow movement efficiency and safety. Therefore, an improved social force model is proposed for rail transit pedestrian flow's movement features and model, based on the detailed reviews on state-of-art of researches on the pedestrian flow characteristics, flow model and the existing researches on urban rail transit pedestrian flow movement at home and abroad, The model, in perspective of the individual movement needs and based on behavior characteristics analyzes the characteristics of pedestrian flow and how the infrastructures affect the flow, and implement simulation on computer. The main research works in this paper are as follows:In the first place, observation and analysis on pedestrian movement properties in straight flat corridor of rail transit station are completed, the fitting curve of velocity and density is finished, the experimental results well be as input and validation for pedestrian simulation system and model. In the second place, a pedestrian flow movement simulation model based on the social force model is established, the model is introduced rules of forces decomposition in the optimal velocity model, some judges is added for reducing a lot of unreasonable and unnecessary calculations, the introduction of excessive overlap eliminating mechanisms, rules for interaction with walls and random deviation rules can produce more realistic simulation of flow movement. In the third place, the model algorithm is optimized, a rectangular interaction area is introduced, pedestrian outside the area won't effect the pedestrian and thus can be neglected for force calculation, an array for psychological forces and array for forces with walls are defined and memorized, so that results can be reused, which are greatly improved the computational efficiency. Ultimately, SubPeds pedestrian flow simulation system is built for some common environment in the rail transit, which provides a basic experiment platform for studying pedestrian flow characteristics with the application of social force model, it can simulates pedestrian self-organizing phenomenon and studies the model parameters setting which have an effect on the simulated phenomenon, the comparison and analysis with actual observation data and other data proves that the improved model can be more accurately simulate pedestrian movement.