Simulation On The Front Impact Of Vehicle And Optimization Of Energy-absorbing Members In Front-end Of Car Body

Car frontal crash accidents are the most frequent traffic accidents. On the one hand, agood energy absorption characteristic of the vehicle front structure is required. Thisstructure is able to absorb the kinetic energy of the vehicle rely on their own deformation,playing the role of the collision impact mitigation; On the other hand, the body structureshould also has good stiffness to prevent the front part of the passenger compartmentintrusion, and to remain occupant survival space. Designers have to optimize theconfiguration of material in the body structure, so as to achieve a balance between the twoperformances.Due to the development of computer-aided analysis techniques, the Car collision isrealized in computer simulation, so the design cycle is greatly shorten. The results of theseanalysis contribute to other aspects of vehicle performance parallel development, to avoidirreparable wrong; the accurate simulation even quantitatively guide the design. In thispaper, the study is based on the national "12th Five-Year" project of the Ministry of Scienceand Technology Support Program. An independent brand cars100%positive overlap rigidbarrier crash test simulation is carried on, which references to the provisions of the2012version of the C-NCAP.In this paper, an effective Car frontal crash finite element model is established. TheCAE collision modeling key technologies and standards is systematically exposited. Thecrashworthiness of the conditions is analyzed and evaluated from changes in acceleration,impact force changes, structural invasive amount, and so on. Simplified vehicle model,which greatly improves the efficiency of the optimization design, is performed. A secondarydevelopment of software in HyperWorks environment is performed. It is for thecumbersome operational problems encountered in the process of car crash finite elementanalysis. The mature experience is programmed into automated computer processes toimprove the efficiency of finite element analysis. The sequence optimization and reliabilityassessment method is introduced in this paper. The Kriging mathematics agent models ofthe finite element simulation are built through the design of experiment. A reliability optimization design is processed to improve the crashworthiness without weight gain.Through the optimization design, thicknesses of the vehicle body front-end energyabsorbing components are used as design variables.A simplified method of car head-on collision on finite element simulation model issummed up, a number of automated pre-processing tools are developed, and the SORAmethod is introduced in crashworthiness analysis. Eventually an effective optimizationproposal is proposed, which consider the reliability of the design variables and otherindicators do not drop the case. The vehicle collision peak acceleration is lowered by13.9m/s2. The expected optimization consequent is achieved.