Research On Optimization Design Of Body Structure Under Side Explosion Environment

Under the current asymmetric warfare,the light wheeled armored vehicles with excellent mobility and protection to make it on the battlefield has been widely used.With the change of the battlefield situation,the threat posed by improvised explosive devices to vehicles and occupants is increasing,it is of great significance to study the dynamic response of vehicles and occupants under the impact of shock waves to improve the anti-explosion shock performance and enhance the survivability of occupants.A certain type of military vehicle is recognized as research object,the body structural response and occupant damage response under explosive environment were studied by theoretical analysis,numerical simulation and experimental study.The main methods are as follows:Firstly,the main algorithms of explosion simulation are analyzed.By comparing the results of detonation test of the fixed-square target plate,the feasibility and accuracy of the CONWEP method for the explosion simulation are verified.Then,the whole vehicle finite element model is established.Through the modal analysis method,the numerical modal analysis and experimental modal analysis of the cab BIW structure are carried out to verify the accuracy of the finite element model.At the same time,static and dynamic mechanical tests were carried out on the material of the vehicle body.The mechanical behavior and damage characteristics of the material were studied,which provided accurate material parameters for numerical simulation.At last,the simulation model of vehicle side explosion is established,and the response of the body structure and the damage response of the occupant under the shock wave are analyzed.Combined with the simulation results,the structural improvement design of the door and body side is carried out respectively,which improves the original vehicle protection ability.At the same time,the multi-objective optimization design of the improved structure is carried out.The results show that the energy absorption capacity of the optimized body structure is increased,and the damage risk of the key damage parts of the occupant is significantly reduced,the protective performance of the vehicle side explosion is improved.Therefore,the research methods and research results of this paper have certain guiding significance in improving the vehicle protection ability,and can provide some valuable reference and theoretical basis for improving the existing vehicle protection ability and developing new type of protective vehicles.