Analysis And Research On Shock Response Of Underwater Shock Test Platform

Submarine hull structure and submarine-borne equipment are important components that affect submarine vitality.It is very important to improve the strength of submarine structure and enhance the impact resistance of submarine equipment.The impact resistance of submarine equipment is often lower than that of hull structure,so it is very important to carry out underwater impact test platform for submarine equipment assessment.Firstly,the paper introduces the specific process of underwater explosion and load calculation.The basics of display dynamics in finite element analysis,the basic theory of the acoustic-solid coupling method and the theory of impact spectrum and related principles are also explained accordingly.The main research content of this paper is closely related to the dynamic response of the structure under underwater explosion.Based on this,a finite element model is established to verify the effectiveness of the acoustic-solid coupling method in dealing with related non-contact explosion problems.Secondly,the ANSYS and HYPERMESH software are used to establish the finite element model of the whole boat,the overall damage mode of single-layer cylindrical shell under shock wave is introduced,the impact of hydrostatic pressure on the overall impact damage of the whole boat structure is verified.Based on this,the ABAQUS software is used for finite element analysis and calculation,and based on the acoustic-solid coupling method,the damage mode of the whole boat under shock wave is analyzed,and four damage modes and critical impact factors are obtained.Then,the structural strength and impact environment of the underwater impact test platform are explored,use ANSYS and HYPERMESH software to perform pre-processing modeling and meshing on the underwater impact test platform,use ABAQUS numerical simulation software,and adopt the sound-solid coupling method.Based on the analysis of the impact spectrum method,the impact parameters of the angle of attack,water depth,and explosion distance on the impact environment of the underwater impact test platform are obtained.The results show that the higher the angle of attack,the larger the transverse spectrum,the smaller the vertical spectrum.When the equivalent of the cartridge is constant,the explosion distance decreases,and the biaxial spectrum values increase.And the greater the biaxial spectrum when the water depth increases.And the difference of the spectrum drop effect of the equipment on the inner bottom plate of the underwater impact platform and the deck simulator are compared,and found that the spectrum drop effect of the deck simulator is significantly higher than that of the inner bottom plate.Finally,based on the previous research,according to the concept of sag ratio,the underwater impact test platform is compared with the surface platform to explore the conditions when the floating impact platform can replace the underwater impact test platform for submarine equipment assessment,so as to simplify the actual sea test.Through the corresponding calculations carried out under working conditions of different parameters,the influence rules of equipment parameters and load parameters on the sag ratio of the impact environment of the underwater platform are explored.Using the finite element method,the same equipment was coupled with the underwater impact platform and the whole boat,and the similarities and differences of the impact response under the same impact factor are analyzed,which provided a basis for the underwater impact platform to carry out equipment assessment.