Research On Indoor Three-dimensional Emergency Evacuation Routing For Fire

With the continuous development of digital city,the internal structure of large buildings becomes more and more complex.When an emergency such as a fire occurs,it is often accompanied by a large number of casualties and property losses,so the demand of how to plan safe and effective routes of emergency evacuation becomes more and more urgent.The traditional indoor navigation algorithm mainly considers the geometric information of the indoor model,and less considers the structural semantics of the building and the fire parameter semantics that are important for the evacuation decision in the case of fire,so it is difficult to find an indoor path according to the fire field change dynamically.For demand of the emergency evacuation in case of fire,taking into account the multi-dimensional semantic information with the fire scene,the indoor three-dimensional emergency evacuation path-finding method with multiple semantic constraints is studied.The main research contents of the thesis include:(1)This paper proposed an extended indoor three-dimensional expression model for fire emergency evacuation.According to the analysis of indoor emergency evacuation factors in case of fire and the model requirements for indoor fire emergency evacuation,the paper expands the indoor components for fire emergency evacuation which the traditional indoor three-dimensional models lacks and defines the position of indoor components based on IndoorLocationGML,and construct the indoor three-dimensional expression model for fire emergency evacuation,which provides navigation model support for the indoor three-dimensional emergency evacuation routing method with multiple semantic constraints;(2)This paper established the expression of semantic expression for three-dimensional emergency evacuation routing in case of fire.In view of the accessibility,high efficiency and safety requirements of the indoor three-dimensional emergency evacuation path in the case of fire,through the semantic analysis of indoor environment for fire,the paper considers the effect of the path accessibility,path easy recognizability and fire parameters considering the fire scene and establishes an expression of three-dimensional emergency evacuation routing semantic model for fire,which provides a quantifiable semantic information description for the indoor three-dimensional emergency evacuation routing method with multiple semantic constraints;(3)This paper proposed an indoor three-dimensional emergency evacuation routing method with multiple semantic constraints is proposed.In order to meet the require of fire emergency evacuation,this paper establishes an indoor routing cost function considering the path accessibility of the fire scene,the path identification of the fire scene and the fire parameters,and combines indoor 3D road network model with the 3D grid model,and optimizes the evaluation function of the A* algorithm,and then proposes the indoor 3D emergency evacuation routing algorithm with multiple semantic constraints;(4)Experimental design and implementation.Based on the indoor three-dimensional expression model for fire emergency evacuation proposed in this paper,this paper takes the Liren Building of the University of Electronic Science and Technology of China as the experimental object to carry out indoor three-dimensional modeling and expression,and then abstracts its road network model for fire emergency evacuation,and uses FDS fire simulation software to simulate and calculate the fire parameters of the A district of the Liren Building.And based on the emergency evacuation semantic model established in this paper,a variety of different environment semantics and user semantics are simulated to verify the effectiveness of the indoor three-dimensional expression model for fire emergency evacuation and the indoor three-dimensional emergency evacuation routing method with multiple semantic constraints proposed in this paper.