The Study Of Mass Evacuation Problems Based On Weighted Voronoi

At present, our country is in a period of social transformation. With the rapid increase of urban population, frequent social activities and large gatherings, public safety has become a major issue to be resolved currently. Therefore, study the phenomenon of collective gathering in public places, grasp the characteristics of the group evacuation, explore the reasonable organization and evacuation mode, and then find ways to reduce the risk of accidents is of great importance. In the process of mass evacuation, because of the difference of the space position of the evacuation object,the corresponding emergency situation is different. How to optimize the space-time path of large scale evacuation object so as to improve the system’s emergency performance is also a problem to be solved. The main contributions of this paper are shown as follows:(1) This paper studys the characteristics and the behavior of the group, especially the relationship among the speed, density and flow rate of the population. The interconnection among complex systems can be reflected by the geometric characteristics of Voronoi. The method of point by point programming is proposed to generate weighted Voronoi in this paper. On the base of Voronoi theory, the social dynamics model and population characteristics are combined to establish the model of individual in the group. The feasibility of the model is verified through the comparison of MATLAB simulation experiment with actual population evacuation.(2) The concept of dangerous density area is proposed to get the potential danger area. Thus, the guidance rule of the complex group system is made to guide the relevant regional groups timely so that the existence of hidden crisis and occurrence of the stepping event can be prevented.(3) The experiments illustrate that different population distribution and export situation directly affect the evacuation process. In addition, this paper presents the concept of complex network attraction strength, and according to the intensity of attraction to adjust the weight of exit. The weighted Voronoi region of each outlet is divided through the combination of the weighted Voronoi with the certain weight. The experimental results prove the feasibility of the proposed method, in which the evacuation efficiency is greatly improved under the reasonable adjustment of the outlet weight, which provides a feasible method for the evacuation of the actual group.