Research On Collision Compatibility Of MPDB And CAE Optimization Of Body Structure

Among traffic accidents,the multi vehicle accidents are the main accident form that causing passenger casualties.The differences of vehicles in the appearance,weight,structure and stiffness result the different degree of car body injury and passenger injury.The difference of the front-end structure of the two size of cars prevent the bodywork structure from effectively functioning which results in the energy of collision can not be rationally absorbed,therefore the miniature vehicle may suffer more serious damage.So the design of exerting the crashworthiness of car structure to protect passengers and improving the car crash compatibility in collision accidents has to be the critical link of automotive safety design.While there are relatively few researches directing at the structure design of the crash compatibility in domestic,and the MPDB(Mobile Progressive Deformable Barrier)experiment of the newly released 2021 C-NCAP(China New Car Assessment Programme)puts forward the corresponding inspection index for collision compatibility,therefore,the research of this paper has great theoretical and engineering application value.This paper takes Ford as the research object and normatively builds the finite element model of vehicle collision according to the MPDB of C-NCAP,analyzes the influence characteristics of the mass and stiffness on the crash compatibility.Basing on the studies mentioned above,this paper will propose the structural improvement approach of the vehicle compatibility.Multi-objective optimization of the front structure of vehicle will be carried out based on the requirements of 100% frontal collision and MPDB experiment on the vehicle body structure.The optimal design scheme will be selected and the optimization effect of the scheme on the vehicle will be evaluated.The research result indicated that the crash compatibility can be improved through the adjustment of the stiffness and geometric characteristic of the automobile’s front structure.Reducing the stiffness of the front of the vehicle improves the distribution of energy between the vehicle and the barrier,which can effectively improve the compatibility of the vehicle.In this paper,on the premise of ensuring the crashworthiness of the vehicle itself,the multiobjective optimization design was carried out,which reduced the peak acceleration of vehicle in 100% frontal collision by 3.6%;and reduced the OLC of the barrier trolley in MPDB experiment by 5.3%;and reduced the standard deviation of the barrier deformation by 43.8%;improved MPDB experiment compatibility score by 59%.The research results are contribute to the vehicle enterprises to launch the safety design and optimization of MPDB experiment.