Research On Dynamic Characteristics Of Collapse Energy Absorbing Structure Of Marine Equipment Under Impact Load

With the increasingly stringent requirements of modern ship equipment assessment,the ship’s equipment is facing various complex explosive and impact environments during its service at sea.The ship’s equipment is required not only to have strong operational capabilities,but also to have strong impact resistance to ensure that the ship still has strong combat effectiveness when subjected to severe explosion impact load.In this paper,an energyabsorbing structure is introduced to reduce the damage effect of marine equipment under the action of explosive shock load and improve its impact resistance.Energy-absorbing structures are widely used in the field of anti-collision of automobiles,but they are relatively rare in the field of anti-shock of ships.This paper compares the energy absorption characteristics of different energy absorption structures to select the energy absorption structure suitable for the impact resistance of ship equipment,and gives the law of the impact resistance characteristics of the energy absorption structure when various parameters change.First of all,this article starts from the national military standard and the German military standard,analyzes the impact resistance requirements of marine equipment,and lays the foundation for the future energy-absorbing structure research direction.Based on the super folding element,the quasi-static collapse process of the energy-absorbing structure is theoretically studied and analyzed.The main factors affecting the energy absorption characteristics are presented,and the evaluation index of the energy absorption structure is briefly explained.The numerical simulation analysis method is studied and compared with the theoretical analysis of the energy absorption structure to verify the validity of the finite element model.Secondly,this paper establishes the finite element model of the quasi-static collapse of the metal thin-walled square tube,the thin-walled square tube with induction groove,and the thinwalled square tube with induction groove filled with foam aluminum,and analyzes and compares the deformation mode and force-displacement curve and energy absorptiondisplacement curve.The study found that the initial peak load of a thin-walled square tube with an induction groove is less than that of a thin-walled square tube without an induction groove,and the thin-walled square tube filled with foam aluminum can absorb more energy,which verifies the validity of the theoretical model.At the same time,the finite element simulation has a strong adaptability in studying the energy absorption characteristics of different collapse energy absorption structures.Thirdly,on the basis of dynamic analysis,this article optimizes the structure of the induction tank to obtain the optimal solution,and on this basis,adds the foamed aluminum filling structure,compares the difference in energy absorption characteristics of the two,and obtains the impact resistance suitable for marine equipment Energy-absorbing structure.Due to the applicability difference between the model size of the energy-absorbing structure grid and the whole ship grid,the calculation time is greatly increased,and the dynamics of the energy-absorbing structure is simplified.The simplified energy-absorbing structure is applied to the impact resistance analysis of marine equipment,and the impact resistance characteristics of different installation forms of marine equipment are analyzed,and the differences in impact resistance characteristics are compared to lay the foundation for the subsequent integrated calculation.Finally,based on the theoretical analysis and the numerical analysis results in the previous article,by analyzing the coupling relationship between the hull,the flow field and the equipment,the finite element model of the integrated shock resistance analysis of the marine equipment is established to simulate the impact environment of the explosion of the real ship and study this The shock response characteristics of marine equipment under time explosion shock load.By comparing the integrated calculation results before and after the installation of the energy-absorbing structure,the impact resistance characteristics of marine equipment under the action of explosive shock loads are studied.