Research On Modeling Of 50 Percentile Human Whole Body In China

Lower limbs are one of the most vulnerable parts in vehicle-pedestrian collision accidents,which can often lead to long-term motor dysfunction,disability and even paralysis of pedestrians,resulting in serious social and family burdens.In 2018,the pedestrian lower limb protection performance of vehicles was officially included in China’s new car safety evaluation procedures.At present,most pedestrian lower limb models and all pedestrian integration models used in studies on pedestrian injury mechanism and tolerance limit are based on European and American body signs,while previous studies have shown that body signs significantly affect pedestrian injury.Therefore,the purpose of this study is to establish a Chinese whole-body model based on the 50 th percentile human signs in China,focusing on the modeling and injury research of pedestrian lower limbs,to provide a theoretical model basis for the improvement and improvement of pedestrian protection evaluation rules and vehicle pedestrian protection design in China.The main research work is as follows:Firstly,the development of pedestrian lower limb model and personalization model in the past 20 years was reviewed,as well as the tolerance limits and criteria of pedestrian lower limb injury.Based on the pedestrian lower limb model constructed by the previous team,personalized scaling modeling was carried out based on medical image data of 50 Chinese male volunteers.At the same time,in order to match the grid and computing efficiency of the whole person model,the grid,material and modeling mode of the model were adjusted accordingly,and the interface program of post-analysis of pedestrian lower limb injury index was edited.Thus,the construction of the lower limb of the Chinese personification model is completed.Secondly,the overall modeling of the first version of The Chinese integral human model was carried out and completed,which mainly included geometric extraction of human anatomical structure based on the 50 percentile volunteer scanning data,grid modeling,connection and material assignment of the integral human model.Finally,the head,shoulder,pelvis,chest and abdomen,lower limbs and other parts of the whole human body model were comprehensively verified based on the single organization verification of previous models and the experimental data of local anatomical structures of pedestrian collisions.The results show that the simulation results of local anatomical structure of The Chinese personification model are in good agreement with the experimental results,and the model has high biological fidelity.Finally,based on the general front structure model of family car(FCR)issued by The European New Car evaluation regulations,a vehicle-pedestrian collision analysis model is constructed by coupling the above Chinese integral model.The human body dynamic response and injury risk in typical vehicle-pedestrian collision conditions were studied,and the similarities and differences between the human body response data and the European new car evaluation procedures were analyzed.The results show that the overall dynamic responses of the head,chest and lower limbs of the Chinese pedestrian model match the experimental data published in the European new vehicle evaluation procedures to a certain extent,but there are some differences.In conclusion,based on the medical scan data of 50 percentile volunteers in China,this study constructed and comprehensively verified the Chinese human body integration model,and further analyzed the similarities and differences between the biomechanical response of typical vehicle crashes and the experimental data of European new vehicle evaluation procedures.This study provides a theoretical and model basis for the evaluation of pedestrian protection and the improvement of vehicle front structure design in China.