Simulation Of Evacuation Considering Dynamic Guidance Under Artificial Attack Event

Artificial attacks seriously threaten people’s lives,destroy social stability to a great extent,and hinder social development.Therefore,evacuation under artificial attacks is a scientific problem that needs to be solved urgently.In the case of emergency evacuation,pedestrians in a highly dangerous environment are prone to irrational evacuation behavior,so it is necessary to guide the crowd in the evacuation process,and the selection of reasonable guidance mode is the primary link to ensure the effectiveness of guidance intervention.Evacuation commanders have professional guidance knowledge and literacy,and can effectively calm the panic of pedestrians.Their actions run through the whole evacuation process,which is the key to improve the overall evacuation efficiency and reduce the number of casualties.Therefore,it is of great practical significance to study the influence mechanism of the dynamic guidance of facilitators under artificial attack events on evacuation.In view of this,based on the shortcomings of existing research,this paper firstly analyzes the key factors affecting personnel evacuation under artificial attack events,and determines that "evacuation guidance" is one of the key factors.Compared with the basic model,the floor field model is selected as the underlying framework.Then,the existing evacuation model is improved.Taking the artificial attack event as the background,combined with the physics idea of self-driving force,the attacker’s movement behavior model is established.The dynamic guiding factors of the evacuation commander is introduced,and a cellular automata model of crowd evacuation dynamics is constructed with the combined effect of coupled evacuation commander/pedestrian attraction factors,environmental factors and attack threat factors.Based on the above modeling ideas,this paper describes the information response mechanism of pedestrians from two perspectives.On the one hand,pedestrians directly respond to the guiding role of the nearest evacuation commander.The evacuation commander optimizes the guidance strategy in real time according to the dynamic position changes of pedestrians and attackers in the scene,and makes movement decisions according to the guidance strategy at all times.Based on this,an evacuation model considering the guiding role of the evacuation commander under the artificial attack event is constructed.On the other hand,consider the intelligent behavior of pedestrians’ independent decision-making,clarify the process of pedestrians receiving and processing information,quantify the information interaction mechanism between pedestrians and evacuation commanders,and further build a dynamic personnel evacuation model that couples information dissemination under artificial attack events.Finally,simulations are performed based on the two constructed models.The paper reveals that in the particular context of an artificial attack,the influence mechanism of key factors on evacuation efficiency and casualty number,such as the guiding role of the evacuation commander,the attacking threat of the attacker,the attacking preference of the attacker,the initial position of the evacuation commander,the number of the evacuation commander and the information transmission radius of the evacuation commander.The results of this study provide theoretical support for people to have a deep understanding of the movement rules of people under artificial attack,the characteristics of evacuation behavior and the interaction between various individuals,and provide technical support for the emergency decision response of relevant departments in response to artificial attack.