Crowd Behavior Simulation Research In Unexpected Multi-hazard Situation

Accompanied by the rapid development of economic and society,group aggregation activities increased gradually,a variety of dangerous events occur inevitably in crowd movement.The emergence and development of these hazards poses a great threat to the safety of life and property of this crowd,and also seriously affect social security and stability.Depth analysis and study the crowd movement behavior after the danger,and the achievement of the crowd evacuation simulation under this complex scene have become an important issue to be addressed urgently in the current social management area.Regarding the issue above,this thesis presents a novel crowd behavior simulation method with emotional contagion in unexpected multi-hazard situation.This method takes into account the mental state and crowd behavior in the stress movement process,the psychological state of crowd is reflected in the movement in real time based on the emotional contagion mechanism under the multi-hazard situation.Specifically,we first classify hazards into different types based on their inherent characteristics.Then,we introduce the concept of perilous field for each multi-hazard situation and define the transformation function of the dangerous intensity in different places in the dangerous field to the individual invoked-panic value.Afterwards,we propose an emotional contagion model to simulate the evolving process of panic emotion caused by multiple hazards in these situations.Finally,we introduce an Emotional Reciprocal Velocity Obstacles(ERVO)model to simulate the crowd behaviors by augmenting the traditional RVO model with emotional contagion,which combines the emotional impact and local avoidance together for the first time.In addition to emotional factors,the changes of the individual psychological state will also affect the crowd evacuating process.Based on this,we presents a crowd evacuation method integrating energy expenditure in the unexpected multi-hazard situation,which obtains a crowd evacuation method integrating psychological and physiological mechanisms w.r.t the individual physiological factors and emotional state in the crowd evacuation process.In particular,this method first models the physical condition of the crowd,and realizes the energy expenditure in the process of crowd movement.Subsequently,it correlates the energy expenditure with emotional contagion through the quantitative analysis of the relationship between individual physical and emotional states.Finally,the evacuation process is simulated using an ERVO model with considering energy expenditure.Experimental results show that our method can soundly generate more realistic group behaviors in the multi-hazard situation,as well as the sufficient reflection of the dynamic evolution of individual panic and physical condition.Under the collective effect of psychological factor and physical factor,this crowd evacuation method is more close to actual situation,which makes the simulation authenticity more credible.