Research On The Optimization Design Of Functional Gradient Structure For Occupant's Lower Limbs To Resist Explosion Impac

Under the environment of explosion impact,the lower limbs of the occupants will face huge impact and become the most vulnerable part of the occupants in the war.In this paper,the occupant lower limb protection system of military vehicle is taken as the research object,combining with function gradient structural,the structural response and occupant lower limb injury response under explosion impact are deeply studied by finite element simulation and experiment study with the function gradient structure.The main research contents and methods are as follows:First of all,explosion test and finite element simulation analysis of a military vehicle,extracted the floor acceleration and the lower limb response of occupants are extracted.Secondly,according to the shock wave action mechanism,Dummy-seat-floor was extracted as local equivalent model,and the consistency between equivalent model and vehicle model was verified.According to the established local equivalent model,the leg impact test was carried out to verify the effectiveness of the local equivalent model.Then,the protective performance of different explosion protection foot pad was analyzed.The honeycomb aluminum explosion protection foot pad had better protective performance.Based on partial equivalent models,taking to occupant injury of lower limbs and MATS sandwich layer suction can measure,cellular aluminum MATS cell parameters and the relationship between different gradient structure and occupant response of lower limbs,Lastly,the floor mat for multiobjective optimization design of lightning protection for cellular aluminum,optimized the thickness gradient type honeycomb aluminum lightning protection performance of floor MATS have significantly increased,It not only meets the requirements of protection under explosion impact environment,but also meets the requirements of lightweight protection devices for lower limbs.The research methods and results of this paper provide some reference and guidance for the design and research of the functional gradient structure of the lower limb to resist explosive impact.