Ship whipping motion response prediction method and system under underwater explosion situation

Abstract

The invention discloses a ship whipping motion response prediction method and system under a combined effect of underwater explosive shock waves and bubbles. The ship whipping motion response prediction method comprises the steps that step 1, a ship is equivalent to a uniform cross section free ship body girder, and therefore the prediction of ship motion responses are equivalent to the predication of free ship body girder motion responses; step 2, the load pressure process of the free ship body girder under the underwater explosion effect is divided into five time phases, and a shock wave pressure peak value, a bubble pulsation phase negative pressure peak value and a bubble first time pulsation pressure peak value are collected; step 3, motion displacements in the five time phases of underwater explosion of the free ship body girder are solved. The invention further provides a ship whipping motion response prediction system. The ship whipping motion response prediction method and system comprehensively consider the shock effect of the shock wave and the bubble load on the whole ship, the underwater explosion load pressure is simplified to be five phases, the motion displacements of a ship in different phases are calculated, and therefore project prediction of ship elastic motion or whipping motion responses under medium and distal field explosion effect is achieved accurately, simply and conveniently.

Description

technical field [0001] The invention belongs to the technical field of anti-underwater explosion shock deformation technology, and more particularly relates to a method and system for predicting the whip motion response of a ship under the action of an underwater explosion. Background technique [0002] Under the action of an underwater explosion, the ship is first deformed by the initial blast shock wave, and then the bubble pulsation and radiation pressure have subsequent effects on the ship structure. Impact. In particular, for the longitudinal large-scale structure of the ship, the shock wave acts on the length of the ship for a long time, and the overall motion deformation of the ship caused by it is the basis for further research on the ship's motion response under the action of the explosion bubble. In fact, existing studies often ignore the impact of underwater explosion shock waves, regard the ship in the initial stage of shock wave action as a static state, and ig...

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Problems solved by technology

At this time, although the ship is basically in elastic deformation, the overall response amplitude is relatively obvious, and the impact on shafting and other equipment cannot be ignored

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