Simulation Study On 3D Tunnel Pedestrian Evacuation Based On Agent

In the three dimensional tunnel,the environment is complex.Once disaster occurs,it will seriously threaten the safety of person.The simulation technology is used to simulate the evacuation problem in the three dimensional tunnel,which can provide auxiliary decision making support for emergency evacuation exercises and emergency rescue.In view of the lack of the existing methods for the study of the evacuation behavior in three dimensional laneway.By analysing the various evacuation models and the characteristics of the evacuation behavior of the three dimensional tunnel,this paper presents an evacuation simulation method of three-dimensional tunnel based on the Agent model.Each person in the tunnel is viewed as an Agent,and carrying out study based on Agent’s Perceptual modeling,decision modeling and behavior modeling.According to the density of personnel in different areas in three dimensional tunnel,the evacuation speed of Agent is calculated.Based on the Dijkstra algorithm,the shortest path of evacuation is searched.By linear interpolation and Cardinal interpolation,the real-time position of Agent in the tunnel is determined and the direction of the evacuation is calculated.The vision range of person is set by perceptual system based on Agent.By testing the number of person and characteristics in the vision range,the walking speed of person is calculated.And the collision detection and response between agent and agent,between agent and tunnel is avoided.During the evacuation process,in order to avoid the increase of the person number in the tunnel local areas,the scheduling model is adopted to control the number in the short time through the local area to improve the evacuation efficiency.Based on the theory and method mentioned above,this paper develops an emergency evacuation simulation system for 3D tunnel,which includes three dimensional model construction,path generation,visual simulation,and evaluation and analysis function.The system architecture and class relationship are designed,and the evacuation process in three dimensional tunnel is simulated and analyzed.By setting up evacuation simulation experiments under various conditions,real-time visual analysis of evacuation process is carried out based on viewpoint tracking technology.The experimental results show that the system can effectively simulate the evacuation process in the three dimensional tunnel under emergency disaster,and provide a reliable simulation platform for the evacuation of the three dimensional tunnel.