Finite Element Analysis And Optimization Of Front Anti-collision Beam System And Bulletproof Armor For A Special Vehicle

With the continuous development and expansion of the domestic automobile industry in China,the market demand of special vehicles is also increasing year by year,becoming a new highlight in the automobile market.Among which the special bulletproof vehicles have developed rapidly.Under the premise of ensuring the vehicle mobility,it is imperative to improve the overall passive safety of vehicles.Regarding the special bulletproof vehicles,it is particularly important to improve their low-speed collision safety performance and bulletproof performance.In this paper,a special bulletproof vehicle is taken as the specific research object,and CATIA,Hyper Mesh and LS-DYNA programs are used to carry out the finite element analysis and structural optimization of the bulletproof beam and armor.The main research contents of this paper are as follows:Firstly,the paper analyzes the research status of anti-collision beam system and bulletproof armor at home and abroad,and make a comparison of the low-speed collision safety regulations and bulletproof standards formulated by the countries.Based on the enterprise design process and relevant regulations,it proposes the evaluation method of anticollision beam collision safety performance and bulletproof performance,laying a foundation for the follow-up research in this aspect.Secondly,it establishes the finite element model of low-speed impact of the original anti-collision beam and verifies the reliability of the finite element model by the drop ha mmer impact test.Based on the relevant laws and regulations,it carries out the low-speed impact analysis of the original anti-collision beam under two working conditions,thus proving that low-speed impact performance of the anti-collision beam meets the design requirements.Thirdly,it sets up the three-point bending finite element model of beam and analyzes the flexural behavior of beam.It also established axial crushing finite element model of the energy absorption box and analyzes the energy absorption features of the energy absorption box.By comparing the energy absorption features of beams with different structures and energy absorption boxes,it selects the optimal solutions to form the optimized new anticollision beam system,establishes its finite element model and analyzes and calculates it,and then compares it with the original anti-collision beam system,thus verifing that the collision safety performance of the anti-collision beam system has been significantly improved.Finally,through setting up the finite element models of bullet penetration laminated target plate and single-layer target plate and analyzing their bulletproof performance,and then comparing the bullet hit test results,the paper the correctness of the selected state equation and constitutive model,providing a theoretical basis for improving the simulation of bulletproof structure.Based on the relevant regulations and standards,the paper formulates a new body protection scheme for the special bulletproof vehicles,and carries out finite element calculation and analysis of single-layer and composite structure bulletproof armor with different protection levels,thus verifying that the optimized body protection scheme meets the design requirements.This paper mainly studies the stress,deformation and energy change law of the front anti-collision beam system of certain special bulletproof vehicle after impacted by pendulum ha mmer,and the deformation law of bulletproof armor penetrated by bullet at high speed.Based on the test results and finite element analysis and calculation results,it proposes the optimization direction of the anti-collision beam system and bulletproof armor structure,providing an effective reference for the subsequent design and further research.