Research Of Personnel Evacuation Training System In Public Building Fire Based On Virtual Reality Technology

With the development of economy and social progress in building technology in China, themodern large public buildings appear more and more in the city. Public buildings to meet thegrowing demand, while its fire accident has increasing trends. In recent years, major fireaccidents occurred in public buildings. The reason for this situation, on one hand, is due to thatpublic buildings has large fire hazard itself and great difficulty in preventing fighting. On theother hand, people make mistakes in the evacuation process, and lack of effective daily trainingsystem. Therefore, an urgent need to build low cost, re-use virtual reality public building fireescape training system exists. This paper analyzes the characteristics of X3D virtual realitymodeling language on public buildings for virtual modeling, virtual fire scene modeling, virtualreality evacuate scene modeling and a personnel escape training system in public building firewith several training scenario were studied.This paper builds a full-size model of virtual public buildings and auxiliary evacuationfirefighting equipments on the based of X3D virtual reality modeling language basic geometrynodes, combined with3D Studio Max software. Light node and Background node are used toestablish a virtual environment. Viewpoint node and node NavigationInfo navigation informationnode are used to establish a virtual navigation system. Studies shows that: the use of spacecoordinate transformation technique, texture mapping technique, living example technology andexternal references technologie can avoid complex coordinate calculations in the modelingprocess, and have more realistic without increasing the number of polygons in the premise, andreduce memory share for improving rendering speed and quality, and achieve a structured,hierarchical modeling.This paper uses large eddy simulation software FDS to simulate public buildings firescenarios. The finite cell method is presented to present fire and smoke development results inthe virtual space. SFPE model-based Pathfinder simulation software is used to simulate freedompersonnel evacuation under fire, combined with the virtual modeling language X3D’s positionand orientation interpolators can show up the simulated results effectively. X3D virtual modelinglanguage KeySensor button sensor node, Collision node and Script node are used to establishcontrolled evacuation model. Studies show that: finite cell method can accurately create virtualmodel of the fire scene. Using X3D virtual modeling language detector nodes, interpolator nodes,nodes, collision node and script node can establish an evacuation model with strong sense ofimmersion.Taking a typical high speed rail station for example, a personnel escape training system inpublic building fire with several training scenario are established. By the training of trainees canfind that: the public virtual reality training system for building fire escape has strong sense of reality to achieve the purpose of training. What’s more, the improvements of fire protectiondesign for building are proposed.