Research On The Protection Technology Of Anti-impact Vehicle Body Flexible Bottom Structure

Under the current local asymmetric operation warfare,the anti-blast vehicle has been widely applied in the battlefield due to its excellent maneuverability and protection ability.With the changing situation of the battlefield,the threat of the improvised explosive device is increasing for vehicles and occupants.Therefore,it is important to improve the protection performance of vehicles and occupants under the condition of explosion shock without affecting the mobility of the vehicle.Based on a certain type of armored transport vehicle as the research object,by the methods of theoretical analysis,numerical simulation and experimental study of a combination of explosive environment response body structure and occupant injury response is studied,put forward the concept of the flexible structure protection,the multi-objective optimization is to optimize the structure.The main methods are as follows:First,the air parameters of explosives and the response of V type protection bench under blast impact are verified by experiment and simulation,which verifies the feasibility and accuracy of the ALE method for explosive simulation research.Then,the simulation analysis of different flexible bottom structures and dummy tibia under different pulse loading on the vehicle floor is carried out,which proves the rationality and necessity of loading flexible structure on the floor,providing a theoretical basis for subsequent vehicle structural analysis and optimization.Then,the vehicle finite element model was created,and the static and dynamic mechanical tests on vehicle materials,provide accurate material parameters for numerical simulation model is established in the explosion simulation under the boundary conditions,through simulation and experimental verification of the vehicle protection level.Finally,the flexible bottom protection structure is applied to the body structure,and the simulation results show that the flexible bottom structure improves the protection capability of the original vehicle.Finally,the flexible bottom protection structure is applied to the body structure,and the simulation results show that the flexible bottom structure improves the protection capability of the original vehicle.In the case of occupant protection safety margin is large,the parameters of the flexible cab body bottom and bottom plate size of multi-objective optimization design,improved body structure optimized to reduce the risk of occupant injury,while reducing the cab quality,improve vehicle mobile combat capability and economics,and the optimization results verified by bench test.The research methods and results have some guiding significance in improving vehicle occupant protection ability and reducing vehicle body quality,which can provide some theoretical reference for improving the existing vehicle protection capability and vehicle body lightweight.