| Underwater submersibles need to withstand sea water pressure and harsh environments,which put forward high requirements on the performance of their pressure-resistant structures.At the same time,the quality of the pressure-resistant shell occupies a high proportion of the total mass of the underwater submarine,and provides most of the drainage volume.Therefore,under the condition that the strength and stability of the pressure-resistant shell meet the requirements,the optimization of the pressure-resistant shell Pressure shell structure parameters,reduce the pressure shell quality,can increase the battery carrying space and reduce the power consumption of the buoyancy adjustment device,which is of great significance for improving the endurance of the deep-sea unmanned submarine,and it is the determination of the working depth and performance of the submersible.One of the important factors.In this paper,the finite element analysis software Abaqus is used to carry out parametric modeling and finite element simulation calculations for the pressure-resistant structure,and various modeling methods for pressure-resistant shells are studied.The VUMAT subroutine is combined with the Hashin criterion and the Python script is used.The strength performance and stability of the pressure-resistant shell are analyzed,and the parametric modeling and simulation calculation are realized.Convergence analysis on the grid size,element type and time step is carried out on the calculation results,and a parameterized calculation method suitable for the optimization algorithm is obtained.Finally,with the help of the finite element model,the influence of the ply parameters and geometric parameters of the pressure-resistant shell on its stability and strength performance is analyzed,and the specific contribution of the shell wall and stiffeners to the shell’s pressure performance is analyzed.Based on the method of finite element calculation,with the help of genetic optimization algorithm,a genetic optimization algorithm program is written,the geometric parameters required for parametric modeling are given,and the total model weight,first-order buckling load,and failure factor in the output file are called.A large number of simulation calculations were carried out to explore the optimal parameter combination form to achieve the purpose of optimization design,and the optimal parameter combination of the pressure shell under different constraints was obtained.Finally,the change trend of the parameters in the optimization process is analyzed,combined with the above analysis of the correlation between the pressure shell parameters and the pressure performance,the rationality of the optimization results is analyzed.According to the optimization plan,the theoretical ply obtained by the optimization calculation was modified for the suitability of winding preparation,and the 112 mm outer diameter pressure shell was wound preparation,solidified and formed,and the pressure holding test was carried out to test its water tightness,and finally the ultimate compression was carried out.Test,study its ultimate hydrostatic pressure load,compare its ultimate load with the original plan,and study its failure mode.The average limit hydrostatic pressure load of the three specimens is44.36 MPa,the maximum relative deviation is ±0.917%,and the consistency of the three specimens is good.Compared with the original plan,the average water pressure value of the specimen is 32.78 MPa,which is an increase of 36.17%,which effectively improves the pressure resistance of the cylinder.The first-order buckling load calculated by the finite element method is 47.32 MPa,and the strength failure load without considering the boundary conditions is 58 MPa.The deviation between the limit load obtained by the simulation and the test result is 6.3%. |
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