Study On The Improvement Of Car Frontal Body Structure Base On The New Version C-NCAP With The Simulation

In2012, the new version of the Chinese New Car Assessment Standards putforward higher demands to new cars, that the frontal40%offset impact speed isincreased from the2009version of56km/h to64km/h. That is greatly increased themoment impact and the vehicle body frame will suffer more impact than before. It ismeans that the vehicle impact resistance must meet more requirements. At the sametime, for China’s auto enterprises, it is a huge challenge and they have to improve thedesign level of the vehicle impact resistance. How to make up with more ideas and usevariety ways to add the capability of the vehicle impact resistance, which can help thecars passed the2009version of C-NCAP but failed in the new version test to gainmore stars. This is an important and urgent task.This paper with the CAE simulation technology which is the most advancedtechnology in the field of automotive research, established the simulation model of thefrontal40%offset crash based on the finite model of a hatchback. The all tests aremeet the2012version of the C-NCAP regulations. According to the analysis of thesimulation results, the innovative improvement which armed at to disperse the collisionenergy with new path was made out. Through the tests which the vehicle crashed in56km/h and64km/h collision speed, an outcome showed that the vehicle bodyacceleration peak in the64km/h is much higher than in56km/h. And the mostimportant energy-absorbing parts of the front of the body is the left stringer and itsenergy absorption is much larger than the right front side rail with the analysis. Then,adding a new beam connected the car left stringer from the distal end to the right sidesill rear end in the simulation model. Subsequently, the second optimization is focus onthe new oblique beam and put the most optimal solution of the orthogonal experimentinto the simulation experiments. Find out that the car body acceleration peak is lowerthan no beam. It proved that the new oblique beam is worked to decentralize thecollision kinetic energy and good for car to improve the capability of the vehicleimpact resistance. This thesis got the achievement which is an innovative optimization program toimprove the frontal40%offset impact crashworthiness. The test simulation processresearch in this field has a certain reference values. The optimization for the Chineseauto companies is useful for the stringent crash safety regulations.