Research On Evacuation Modeling And Simulation Of Crowd In Street-alley Attractions

With the continuous development of social economy,tourism and commercial activities are increasingly prosperous,street-alley attractions of large cities may appear "blowout" phenomenon,especially during the holiday.The study of the crowd evacuation simulation is extremely important.The evacuation and simulation of intensive people for street-alley attractions is a complex system engineering,traditional experiments are mostly large-scale manoeuvre under approximate conditions,which needs to consume manpower,material resources and most likely causes unnecessary losses due to improper evacuation.The application of computer simulation technology provides a new method for the evacuation simulation of street-alley attractions of crowded.The evacuation modeling and simulation to tourists of street-alley attractions are based on the model of agent evacuation in this paper.Take South Luogu Lane as an example,the spatial characteristics and crowd characteristics of street-alley attractions are analyzed,the rule to avoid obstacles was added to describe the interaction between agents and the environment.And the dynamic process of simulated evacuation is realized under B/S architecture.The main work and innovation are as follows:(1)This paper proposes an evacuation model of street-alley people based on the agent.The spatial characteristics and crowd characteristics of street-alley attractions are analyzed,and the spatial object design and agent object design are carried out according to the attribute characteristics respectively.The spatial characteristic parameters include the geographic feature distance and area attributes of the street-alley attractions for the actual scene modeling.The crowd is abstracted as an agent in the computer,consider the population's gender and age attributes to design the speed of the agent and define the area radius parameters.(2)Completed the construction of the Boids model considering the obstacles.Boids model basic rule separation,alignment,cohesion behavior describes the interaction between agents,the interaction with the evacuation environment of agent did not consider,that is to say the collision between the agent and the environment will have an impact on the simulation results.This paper designs the rules of the agent to avoid the obstacle,which in the evacuation simulation,the agent can avoid obstacle in the environment.(3)Implemented the street-alley attractions evacuation modeling based on the agent,achieved the work of the evacuation simulation platform based on the canvas technology,the platform is a lightweight version based on B/S.The basic rules of Boids and the rule avoids the obstacle was implemented.The simulation results of the South Luogu Lane show that the developed platform can play an important role in the actual emergency command work,and provide the basis for the actual evacuation command work.The spatial characteristics and population characteristics of South Luogu Lane are analyzed in this paper,and the design of evacuation scene and the design of agent are completed.The rules of agent behavior and the rule of agent avoidance in evacuation simulation are defined through the Boids model.Finally,the evacuation simulation experiment is carried out in the lightweight version of the evacuation simulation platform based on the B/S architecture,which shows the practicability and effectiveness of the evacuation model.The platform has the advantages of simplicity and easy operation,which is beneficial to the integration into the intelligent scenic area management system,and provides reference for the emergency command and decision of the scenic area manager.