Ship whole elastic-plastic movement response predication method and system under action of underwater explosion

Abstract

The invention discloses a ship whole elastic-plastic movement response predication method and system under the action of underwater explosion. The method comprises the following steps: S1, simplifying a ship into a free ship body beam with an equal section; S2, dividing load pressure of the free ship body beam into five time phases under the action of the underwater explosion; S3, solving movement displacement of the free ship body beam in the five time phases under the action of the underwater explosion; S4, solving a bending moment of the ship body beam; S5, solving forward plastic movement parameters of the ship body beam; S6, solving backward elastic unloading movement parameters of the ship body beam; S7, solving backward plastic movement parameters of the ship body beam; S8, solving forward plastic movement parameters of the ship body beam. The invention further provides a system for realizing the method. According to the method and the system disclosed by the invention, the ship plastic movement process is analyzed on the basis of comprehensively considering the impact effect on the whole ship body by impact waves and air bubble loads, and engineering predication of ship whole elastic-plastic movement deformation under the action of the underwater explosion can be accurately and conveniently realized.

Description

technical field [0001] The invention belongs to the technical field of anti-underwater explosion impact deformation of the overall structure of a ship, and more specifically relates to a method and system for predicting the overall elastic-plastic motion response of a ship under the action of an underwater explosion. Background technique [0002] In modern naval warfare, the underwater explosive attacks suffered by ships are mostly close-range effects. The impact of underwater short-range non-contact explosions pervades the entire ship, often causing large-scale equipment damage or even breaking the ship as a whole. On March 26, 2010, the Korean "Cheonan" frigate was instantly broken and sank when it was attacked by an underwater explosion, which can be regarded as a typical example of the breaking and damage of a ship caused by an underwater near-distance non-contact explosion. [0003] For a ship under the action of an underwater near-distance non-contact explosion, it is ...

AI Technical Summary

Problems solved by technology

At present, there is still a lack of a set of theoretical calculation methods in China that fully consider the joint action of explosion shock waves and air bubbles to calculate the plastic deformation of warships with repeated arching or sagging.

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