Simulation And Application Of Two-wheel Electric Vehicle Traffic Accidents Based On Combined Dummy Model

With the rapid growth of the number of electric vehicles in China,the incidence of traffic accidents caused by two-wheeled electric vehicles ranks first in road traffic accidents in various cities in China.It causes a lot of loss of life and property every year.It helps to explore the causes of accidents.The traffic police department conducts scientific accident liability appraisal,analyzes the damage mechanism of the victim to prevent and protect the safety of the cyclist,and the simulation research work on the two-wheeled electric vehicle traffic accident becomes particularly urgent and significant.In order to solve the conflict between the calculation accuracy and computational efficiency of the dummy model,this paper proposes to apply the multi-rigid body-finite combination dummy model to the simulation of two-wheeled electric vehicle traffic accidents.By splitting the standard multi-rigid dummy model and the standard finite element dummy model,a multi-rigid body and finite element local dummy model combining module is used to split the multi-rigid body model and finite element using the hinge connection and constraint method.The model is assembled.In view of the differences in the shape of the victim's human body and the differences in the damage location in different accidents,this paper proposes a combined parametric model customization system based on the actual victim shape feature,and uses the finite element model to obtain accurate damage characteristics at the victim's injury site.A multi-rigid model was used to save the calculation time at the same location.Three sets of simulation tests were also performed to verify the correctness and rationality of the combined dummy model.In order to avoid the influence of vehicle model geometry on the simulation results,this paper proposes an accident vehicle model customization system,establishes a rigid finite element Facet vehicle model based on the real accident vehicle appearance characteristics,and establishes a tire model to simulate the kinematics performance of the vehicle.The multi-rigid body and FEM contact algorithm were used to define the restraint between the cyclist and the electric vehicle.The cyclist's grip on the electric handlebar was also considered and a human-vehicle-road dynamic model was established.Through the simulation of the car driving turn,the cyclist's electric vehicle uphill,collision obstacles,and more steps of simulation tests have verified the driving stability of the vehicle tire model and the accuracy of the human-vehicle-road coupling dynamics model.Through statistical analysis of 297 two-wheeled electric vehicle traffic accidents with case files of Shanghai Traffic Police Corps,the general laws of two-wheeled electric vehicle traffic accidents were obtained,and three typical accident cases were simulated and analyzed.The measurement method reconstructs the accident site in three dimensions and obtains the initial relative position and initial velocity of the vehicle before the accident.The simulation parameters are set according to the MADYMO multi-rigid body and finite element algorithm for simulation.The simulation results of the simulation and the accident monitoring video are simulated.Basically the same,the damage characteristics and damage degree of the dummy model obtained according to the human injury index are also basically consistent with the damage situation of the victim in the accident,which further validates the proposed multi-rigid body-finite combination manikin model for two-wheeled electric Vehicle traffic accident simulation can not only simulate and reproduce the accident process,but also accurately infer the damage of the cyclist,which has a high application value.