An In-depth Investigation Technique Of Vehicle-vehicle Collisions

In recent years,with the rapid development of China's automobile industry,with the rapid increase of automobile amount,it results in road traffic accidents continue to occur,this brings many difficulties at the same time for traffic management,but also a serious threat to people's life and property safety.In the road traffic accident,the collision accident is the most frequent and most serious consequences,therefore,the use of computer simulation technology is efficient,timely and accurate processing of car to car collision accident,it is an important topic of social significance.In order to capture vehicle collision accident scene important trace information quickly and accurately,the process of traffic accident investigation is introduced firstly,and the traces of the scene of the accident analysis,sensitivity analysis,and then introduce the car to car collision accident scene traces.first got 10 sensitive parameters required immediate attention and related to collision speed through theoretical analysis,then,a method based on random forest model for analyzing the sensitivity of these parameters was proposed,based on the random forest model make 10 sensitive parameters in order,the results show that the influence of automobile braking distance and vehicle collision angle is the most significantIn order to reconstruct and analyze multiple vehicle collision accident,a fractional-step reconstruction method about multple vehicle collision was proposed on Pc-Crash.By dividing the multiple vehicle collision process into some collision of two vehicles,the first collision of two vehicles is simulated firstly,and the next collision of two vehicles in the accident will be simulated when the instant motion parameters of the previous collision are obtained.Do this step a few times over,make sure all of the collisions' simulation results accord with the true traces.Finally,a three vehicle collision accident was given,the steps of the method were demonstrated,and result show that in the simulation of vehicle trajectory and vehicle damage is consistent with the actual.In order to make full use of the occupant injury information related to the accident reconstruction,first,using Pc-Crash software to simulate a real case with join the movement simulation of occupant,and the simulation damage is consistent with the actual damage,it is proved that the occupant injury can effectively guide the accident simulation.Then,got key impact factor of different occupant injury site by random forest,the results showed that the greatest influence on the head injuries are speed;the greatest influence on the chest is collision angle;the greatest influence on the knees and femur are the friction coefficient of the vehicle;the greatest influence on the leg is vehicle deceleration.The completion of this study will promote the study of road traffic accident reconstruction in our country,and provide a new method for traffic accident analysis and reconstruction,and provide a strong basis for accident prevention and responsibility.