Research On Functional Gradient Structure Optimization Design Of Underbody Protection

With the widely used of armored vehicles of the modern warfare,it's survivability on the battlefield and the protection of occupant's safety become an important problem,which is unable to avoid.How to improve the protection ability of the vehicle underbody,improve the chances of survival in the battlefield,under the premise that does not affect the other performance,has become the common challenges that the military,experts and scholars around the world faced currently.Therefore,unfold the research and application of the new resist-impact material and structure,develop the structure optimization and design of the vehicle underbody,which has great significance.In this paper,a certain type of armored vehicle has been seen as the research object.Based on the existing technology of vehicle underbody protection of recent domestic and international,introduced the functional gradient structure which has the better protective performance that resist the blast impact,with the research approach that combine with the theoretical analysis,experiment research and optimization design,used the technology of multi-objective optimization design to enhance the ability of resist the explosion shock of the vehicle underbody,which must be does not affect the vehicle mobility and vehicle passability.Using different explode simulate algorithms to model the blast impact that the unconstrained object target subjected,combined with the test results to analyze the advantages and disadvantages of different algorithms.Introduced the mechanical properties of functional gradient structure,research the effect of different structure parameters on the impact performance against explosion.Compared the effect of energy absorption and the ability of resist-deformation of the functional gradient structure under the different boundary conditions.In order to study the dynamic response of the vehicle body and occupant when the vehicle subject the blast impact,numerical simulation technology has been used to model the explosive,take the structure deformation of the vehicle body and the occupant crus tibial force as the response index.Previously,some basic experiments have been arranged to research and verify.Combined with the technology of multi-objective optimization design,with the setting of density gradient,thickness and angle parameters,the thickness of the vehicle underbody as the design variables,with the maximum of energy absorption,the minimum of structure deformation and occupant damage as the objective functions to conduct the optimization calculation.Through the above steps,find out the optimal design parameters which satisfy the requirements,improve the ability of vehicle underbody's resist-impact.The study of this paper found that the impact resistance of functional gradient structure is superior than the ordinary homogeneous structure,the structure parameters that after the multi-objective optimization revealed the better performance.Therefore,the research method and results in this paper has a certain guiding significance at the aspect of improve the vehicle protection ability,which can provide the technical assistance and theoretical reference in the R&D of new pattern protective vehicles and the ability promotion of the existing vehicles.