Study On Improvement And Optimization Of Protective Structure At The Bottom Of A Body

Landmine exploded in the bottom of the vehicle which can tear the car body structure and make the fragment, shock wave, poisonous gas into the car. Also, the deformation of the car body structure, the transient accelerated speed and plus load can cause great damage to the passengers. Therefore, to carry out the research on the protection of the bottom of the body structure is of great significance.In this paper, combined with theoretical analysis, simulation and multi-objective optimization design, bottom protection of a certain type of car body structure and indoor occupant was carried out by the transient response of the explosion shock wave environment, and improved and optimized the body protection structure at the bottom of the car.To verify the rationality of the simulation algorithm and key control parameters through impact test field of mine explosion, and introduced several kinds of simulation Algorithms of shell structure under the environment of explosion shock waves comparing the advantages and disadvantages of each simulation algorithm with theoretical analysis. Introduced finite element modeling process of body and frame model of body and frame model under landmine explosion environment, analyzed the simulation results from the damage form of body structure and dummy.Combined with the actual research of model structure, analyzed the current mainstream of several kinds of protection scheme. Finally put forward a kind of V sandwich structure. Then carried out multi-objective optimization design of V sandwich structure. Without any increase in the mass of structure, further improved the shock resistance performance. Done a local improvement on the basis of the original body structure, and carried out numerical simulation of the improved protection at the bottom of the car body structure and the optimized explosion protection at the bottom of the car body structure. The results show that the car body bottom protection performance was greatly increased.