Research On Roll Sensitive Factors Of Car Oblique Rear End Collision

According to the latest global road safety status report statistics,the number of casualties due to traffic accidents still occupies a large proportion.According to the statistics,the proportion of car collision rollover accidents in all traffic accidents is not high.But the process of car collision rollover,accompanied by the contact of two cars,car and ground contact collision,vehicle deformation damage and casualties,and also lead to high property damaged.Although modern society is gradually improving road monitoring facilities,but still do not achieve full coverage.So how to make the establishment of the car diagonal rear-end collision rollover theoretical model and accident reproduction analysis method,can be faster and more accurate reproduction of such traffic accidents,and the responsibility of the accident to deal with objectively,become an urgent problem.Based on the theories of domestic and foreign automobile collisions and vehicle rollover,the thesis focuses on the analysis of the theoretical model of the car diagonal rear-end collision rollover,based on the actual requirements of the laws and regulations governing the handling of road safety accidents,the following research works was carried out.First,the application of theoretical mechanics,automobile dynamics,automobile collision mechanics and other related theories,analysis of the motion of the car in the collision process,the establishment of the car diagonal rear-ended collision rollover mechanics model and critical rollover collision force model.Secondly,combined with the cases of the National Automobile Accident In-Depth Investigation System（NAIS）database,the PC-Crash automobile collision simulation reproduction software is applied to simulate the car diagonal rear-ended collision rollover accident to verify the correctness of the simulation model and reveal the change law of the accident vehicle mechanical parameters in the collision simulation process.Finally,based on the above diagonal rear-end collision simulation scenario applying random forest method,the sensitivity ranking of 15 factors affecting the car diagonal rear-end collision;simulation study of high sensitivity factors on the impact law of collision rollover.