The Dynamics Simulation Of Aircraft Cabin Emergency Evacuation

Aircraft cabin emergency evacuation can not only reduce casualties when aircraft accident happened,is also one of the important reference for evaluation of passenger safety.Using computer simulation technology to simulate the process of emergency evacuation,can make up for the shortage of the real practice,such as spending more and posing a safety hazard.Most of existing emergency evacuation simulation models are the discrete model,they are not very suitable because of pedestrian's continuous moving.And these models is still relatively rough when they simulate pedestrian interacting with others or obstacles,combined with that the individual property is not comprehensive enough to consider.Therefore,this paper constructs the continuity dynamic model of cabin emergency evacuation.In this model,the change of pedestrian's moving state is continuous,and individual property differences are considered more.Firstly,it simplifies the cabin environment,which is put as a two-dimensional space,and divided into several partitions according to pedestrians' movement characteristics.Then,it defines the partition(virtual)exit center coordinates as fixed nodes,and pedestrians' current locations are defined as variable nodes.The nodes is the fundamental element of pedestrian's path selection.In the evacuation,pedestrians chose the shortest path to exit,the(virtual)exit width and pedestrian density are considered too.And analyzing individual property differences is an important content before modeling.Pedestrian has three aspects of geometric,dynamics and psychological attribute,which are discussed in this paper.Gender and age is the basic attribute,and establish the relationship with other attribute by means of statistical analysis.In the cabin,pedestrian's movement is caused by force,which contains pressure,friction,self-drive force and psychological force.The mathematical expressions are presented and the related parameters are discussed and corrected by use of experimental data.For pedestrian moving from the seat to the aisle has particularity,it makes the further analysis,establishes the kinematics equation and discusses the reasonable parameters by using the experimental in this study.Pedestrian's desired speed and the probability of overcrowding will be increased when cabin emergency evacuating in a state of panic.Based on the dynamic model,the emergency evacuation simulation system is programmed with MATLAB platform.The system which has the advantages of simple operation and adjustable parameters,can simulate a variety of models and dynamically display the realtime situation of the evacuation simulation.The system is used to simulate the emergency evacuation drill of ARJ21-700(90-seat)and A320(150-seat),and the results is very close to the real value.The result of further using the system simulation in a state of panic cabin emergency evacuation situation shows that the total evacuation time will be shortened when panic degree is low.But high panic degree will reduce the evacuation efficiency,even lead to evacuation failure.