Research On The Influencing Factors Of Pedestrian Head Injury Based On MADYMO

The rapid development of the automobile industry and the continuous introduction of new models.In recent years,the number of automobiles in my country has continued to rise,which facilitates people’s travel,but also causes road congestion and an increasing number of traffic accidents.According to statistics,the fatality rate of pedestrians has reached 25%.According to the accident analysis in the NAIS database,pedestrian injuries mainly come from frontal collisions with cars.Among them,head and leg injuries occurred the most,and 64% of pedestrian deaths were caused by heavy blows to the head.Therefore,it is of practical significance to study and analyze the law of pedestrian injury for reducing pedestrian injury.This paper investigates traffic accidents involving people and vehicles that occurred in Harbin from January 2020 to December 2020.Through statistical analysis of accident cases,it analyzes the vehicle type,collision speed,vehicle collision position,pedestrian orientation and pedestrian emergency posture in the collision of people and vehicles.and other accident characteristics.Based on the theory of collision mechanics,a multi-body model of the crashed pedestrian and a mathematical model of the collision mechanics between the pedestrian and the vehicle are established.Introduce pedestrian head injury grade and evaluation standard,introduce MADYMO software dummy library and dummy scaling method,use MADYMO software to establish multi-rigid body simulation model of pedestrian collision based on actual typical cases,carry out typical case accident simulation reproduction,and based on actual accident Vehicle and pedestrian movement process,vehicle damage and pedestrian injury report to verify the validity of the established model.Based on the mathematical model of human-vehicle collision mechanics and the multi-rigid three-dimensional simulation model,using the orthogonal test method and the variance analysis method,it is concluded that the collision speed,the collision position of the vehicle,the steering angle,and the braking deceleration are the high sensitivity factors for pedestrian head injury.,revealing its influence on pedestrian head injury,as follows: in a pedestrian collision,the HIC values of the pedestrian’s head in the primary collision and secondary collision are basically linearly related to the collision speed;in a collision,when the collision position of the vehicle is different,the squat The pedestrian head HIC value of the pose is the smallest.Combined with the driver’s driving mode,information processing process and emergency response,the influence of the vehicle steering angle and braking deceleration on the pedestrian’s head injury is analyzed.In a collision,the influence of the vehicle’s steering is the HIC value of the pedestrian’s head in a squatting posture.Minimum;different braking has little effect on pedestrian head injury;the larger the steering angle of the car and the greater the braking deceleration,the smaller the pedestrian head HIC value;the car steering and braking have little effect on the pedestrian head secondary collision HIC value The effect is not large,but it can also be observed that the head injury of pedestrians decreases with the increase of the braking force of the car.