Abstract: |
Explosion shock of mines or improvised explosive devices below a vehicle will directly endanger the safety of occupants’ lower limbs. Therefore, with a shell shape section as the prototype, this paper designs a bionic protection device for lower limbs through the principle of structural bionics.Based on the local equivalent model of the occupant restraint system, protective performance of six kinds of protective devices are analyzed, such as traditional double circular tubes, circular ribs, bionic shell thin walled tubes, bionic shrimp claw thin walled tubes, bionic bamboo thin walled tubes and bionic horsetail thin walled tubes.Single factor analysis is carried out on the structural parameters of the lower limb bionic protection device, and the preliminary design scheme is determined.Taking the axial force of the left and right lower tibias of the dummies as the optimization target and the total deformation of the protective device as the constraint condition, this paper uses the NSGA Ⅱ genetic algorithm to carry out multi objective optimization of the bionic protective device to obtain the optimal parameter combination of its protection performance. The results show that, after the bionic protection device is installed, the peak axial force of the left and right lower tibias reduces by 66.76% and 66.22% respectively, which meets the requirement of AEP 55 limit of 5.4 kN and can provide effective protection for occupant lower limbs. |