Analysis of protective performance of large ship's cylindrical underwater protection structure
[Objective]In response to the problems of high weight and relatively low protective efficiency associated with traditional multicamerate structures(i.e.,void compartment-liquid tank-void compartment),this study explores the protective performance of underwater cylindrical protective structures.[Methods]A numerical model based on an arbitrary Lagrangian-Eulerian(ALE)algorithm is established and verified through a contact explosion case involving a typical structure.On this basis,models of the traditional multi camerate protective structure and cylindrical protective structure are then established.Through numerical sim-ulation,parameters such as maximal stress,strain and energy absorption after underwater contact explosion with the same explosive charge are analyzed,and their respective protective performances obtained.[Results]The displacement of the defended longitudinal wall of the cylindrical protective structure is smal-ler than that of the watertight longitudinal wall,which is contrary to the behavior of traditional multicamerate protective structures.Additionally,the energy absorbed by the deck and double bottom is 9.92%less than that of the traditional protective structure,demonstrating a significant advantage in resisting deformation in the ver-tical direction.[Conclusion]The results of this study indicate that the cylindrical protective structure exhib-its a lower level of damage under the same charge,providing new insights for the innovative design of under-water protection structures.
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