Folded airbags have a wide range of applications in underwater salvage.Considering the influence of water pressure and inflation parameters,whether the airbag can be rapidly and steadily inflated is the key problem.Numerical simulations of the airbag can be used as a powerful tool to reduce the development time.To enable the behavior of the flotation bag to be accurately modeled,a combined Euler-Lagrange analysis was carried out in the finite element software MSC.Dytran using a general coupling surface.Two finite element models of the same cylinder flotation bag were established using the Initial Metric Method(IMM).One model is called Initial state and the other is called Reference state.The IMM folding technique can avoid negative deform of membrane elements significantly especially the final shape of the deformed bag.Besides,the relationships between the aeration rate and airbag parameters(volume and pressure)were discussed.
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