Protection Performance Analysis and Optimization Design of Vehicle Roof Sandwich Plateunder Air Explosion Condition of Fragment Warhead
In modern warfare,many fragmentation warheads choose the top of vehicle as the preferred attack position to achieve long-range precision strike,but there is little research on the top protection of vehicle under the combined action of shock wave and fragmentation at home and abroad.In order to improve the protection performance of the top of special vehicle and realize the lightweight structural design,The effectiveness and accuracy of numerical simulation are verified by the NATO first-stage alternative charge explosion test and the theoretical calculation of fragment dispersion.A solution processing program for analyzing the fragment point distribution at different initiation heights is written by using Python according to the LS-DYNA analysis result data and the fragment ballistic equation.Then,an I-Y type sandwich plate is designed and compared with another five types of sandwich plates with different structures to prove its superiority.Further,The effects of explosive initiation mode,relative position of explosive,thicknesses of panel and backplane,and structural parameters of sandwich layer on the protection performance of I-Y plate are studied by taking the mass loss,energy absorption,peak displacement and fragment velocity distribution as evaluation criteria.Finally,the thickness of panel,the thickness of backplane,the height of sandwich layer and the width of cell are selected as the design variables,and the peak displacement of backplane and the quality of sandwich plate are taken as the optimization objectives.The optimal Latin Hypercube test method is used for sampling,Kriging method is used to construct the proxy model.and NSGA-Ⅱ genetic algorithm is used for multi-objective optimization.the optimal solution is simulated and verified,which provides support for the optimization design of roof protection structure under the combined action of shock waves and fragments.
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