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A Numerical Study of the Dynamic Responses of Underwater Structures Subjected to Underwater Shock

Author: ZhangYiFan
Tutor: ZongZhi;LiHaiTao
School: Dalian University of Technology
Course: Design and manufacture of ships and marine structures
Keywords: Underwater explosion Numerical calculation Dynamic response Cavitation effect
CLC: U661.3
Type: Master's thesis
Year: 2010
Downloads: 136
Quote: 0
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Abstract


Underwater explosion is a very complex energy conversion process . There are many differences between physical phenomena and loads with the explosion in the air due to the different physical properties of water and air , making the underwater explosion . Study of underwater explosion problem involves not only the physical phenomena , and loads of the explosion , and also relates to the structural response and complex fluid-structure interaction problems , through detailed theoretical study and establish a precise mathematical model underwater explosion analytical solution it is very difficult , and numerical simulation calculations require verification of test data for comparison . This paper studies the underwater blast loading , loading mode and the mode of transmission , to determine back empty plate underwater explosion shock loads dynamic response . Using ABAQUS software , set up under the back empty plate underwater explosive shock numerical calculation model . Numerical simulation is consistent with experimental results found by comparison with the experimental values ??, to verify the accuracy of the numerical method . On this basis , the impact value calculation precision parameter sensitivity analysis , to provide a reference for the simulation of large-scale numerical model . Secondly, after verification of the accuracy of numerical simulation of the actual structure of an underwater underwater explosion shock response calculation , different time changes in water pressure and structural stress ; , and along the structure length and height direction different measuring points response of the analysis, to obtain the dynamic response of the whole structure . By analyzing the effect of the underwater explosion caused by cavitation , the results show that : the area of the collapse of cavitation be underwater structures produce secondary loading effect, and secondary loading response have a greater impact on the underwater structure during underwater explosion numerical simulation calculation of spatial and temporal effects can not be ignored . Finally , the introduction of underwater explosion test assessment methods , underwater explosion \

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship dynamics
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