Application Of Virtual Reality In Subway Station Fire Simulation

With the development of society and economy, a lot of medium-sized and large cities in China are accelerating the construction of urban subway. The urban subway is playing an increasingly important role in urban development and the urban residents' daily work and life. But in the course of operation, security accidents often occur, it causes not only tremendous loss of lives and property but also serious effects. Therefore, to research subway safety has become a subject of great concern.Aiming at characteristic of subway fire, the reason of subway fire and protective measures are analyzed. The virtual reality technique and its advantage in subway fire safety management are introduced.Virtual Reality is one kind of technology that can produces a highly real simulation environment by using computer algorithm to make users immerse into the virtual environment. In this system, man-machine interfaces are used to accomplish interaction between users and virtual environment. Compared with the traditional planform and computer animation, the immersion, interaction and real time function of virtual reality is unapproachable. Based on virtual reality, fire simulation of the subway station provides a technological guarantees for researching subway operation safety and visualization simulation. Aiming at the environment simulation of the subway station, the basic function such as three-dimensional scene of the subway station, roaming and fire simulation are developed by applying the virtual reality technology. Providing a new method for the traditional subway safety simulation and laying a foundation of visualizing security protection of the subway station.By using 3DS MAX software and OpenGL graphics programming techniques, the rendering pipeline of virtual subway station scene is designed Based on the 3DS file format, virtual subway station scene is rendered and can be roamed and implemented in real time. By applying AABB - Axis Aligned Bounding Box algorithm, the collision detection is implemented and strengthened the realistic effect.The fire simulation methods and its technical features is introduced. According to the fire simulation model, the real time fire simulation algorithm based on particle system is studied. The dynamical fire effect is rendered, by using the polygon-patch and texture mapping techniques. Finally, the fire model is used in the virtual subway station, and the locomotive and subway station fire are simulated. Preliminary fire simulation framework of the virtual subway station is established.