Optimization method and system for obstacle geometry in crowd evacuation simulation process

Abstract

The invention discloses an optimization method and system for obstacle geometric shapes in a crowd evacuation simulation process. According to the method, an initial crowd is created randomly; an obstacle type is selected, and the size of each obstacle is set; a video of a designated region is acquired, and a KLT tracing algorithm is utilized to extract crowd evacuation simulation data from the video; a social force model is adopted to perform local path planning, motion tracks of all individuals in an evacuation scene are obtained, and crowd evacuation simulation is performed; whether all shape parameters of each type of obstacles are set is judged; whether a termination condition is met is judged, and if yes, the type and sizes of the obstacles are output, the evacuation time of people is set, the evacuation population in the time is set, and the step is ended; and otherwise an improved DE algorithm is utilized to perform variation, intersection and selection, and a new crowd is generated. The obstacles with certain geometric shapes can shorten the leaving time of all pedestrians, and appropriate shapes can effectively increase crowd evacuation speed.

Description

technical field [0001] The invention relates to the field of crowd evacuation computer simulation, in particular to a method and system for optimizing the geometry of obstacles in the crowd evacuation simulation process. Background technique [0002] In recent years, with the rapid development of social economy and the continuous acceleration of urbanization, the number, scope and density of urban population have increased rapidly, and the number of large-scale events represented by large-scale cultural and sports activities, exhibitions, and commercial promotions in large and medium-sized cities in China has increased. , the number of large shopping malls and entertainment venues is also increasing; their common feature is that the number of people gathering is very large. The greater the total flow of people and the higher the crowd density, the greater the possibility of accidents, especially stampede accidents caused by pedestrian congestion. Although the probability of...

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Problems solved by technology

[0003] In order to improve the pedestrian outflow problem in panic situations, setting appropriate obstacles in front of the exit can effectively improve the evacuation efficiency. In addition, it is found that all geometric parameters of obstacles can significantly affect the pedestrian evacuation efficiency; existing literature has proved that, Placing a barrier in a panic situation does not reduce or absorb the pressure in the exit area, on the contrary, it increases the pressure to a higher level, so the physical mechanism behind the increase in discharge efficiency is not a drop in pressure in the exit area, but through the effective space Separation significantly reduces high-density areas, which ultimately leads to escape velocities and evacuation outflows

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