Secure Evacuation Algorithm Apply In The Three-Dimensional Buildings

With the rapid improvement of the urban construction level,the crowded buildings,such as commercial offices,are becoming more and more complex,which puts forward higher requirements for the building fire safety and evacuation in emergencies.Based on the development of building firefighting systems,fire evacuation algorithm and 3D map technology,in this paper,a three-dimensional secure evacuation algorithm aiming at building fire evacuation problems is proposed.In the meantime,this paper tries to build a complete building secure evacuation system.Aiming at the limitations of the traditional static evacuation algorithms,this paper extends the fire evacuation questions into the three-dimensional environment.According to the development process of indoor fire,and regular patterns of the actual crowd evacuation,the evacuation algorithms proposed in this paper,preferentially protects the personal safety of the people in the fire buildings.It improves the safety performance of the evacuation path,by introducing the influence of heat,flue gas concentration and channel flow density on evacuation into the algorithm.Besides,this paper builds some prediction models of the field temperature and flue gas concentration at the base of three-dimensional space to make the evacuation path securer.In this paper,the ant colony algorithm is used to get the shortest evacuation path under the premise of security.According to the fire evacuation in reality,this algorithm takes the influence of the fire state parameters on the safety and evacuation speed into account,and then puts forward a concept named equivalent evacuation time,taking place of the channel length in the traditional algorithm,as the heuristic function.Aiming at the characteristics of the evacuation of the three-dimensional buildings,this paper proposes some optimization strategies,such as artificial potential field optimization,adaptive pheromone updating strategy optimization,and the optimization of search process,to improve the algorithm's time performance and evacuation path qualityAnd this paper also attempts to apply the evacuation algorithm to solve the actual fire evacuation,then discusses the technical framework of the building safety evacuation system,and the safety verification process of evacuation paths.Use AutoCAD and some other modeling software to achieve the real building modeling work,meanwhile,use FDS command programming to simulate the real fire development process,and the automated testing tools to verify the effectiveness of evacuation paths.At the same time,this paper tries to build an evacuation system including the background server and mobile client applications.Based on the technology of the jPCT-AE rendering engine,the system can provide users who needs evacuated with the navigation service.