船体梁在水下近距爆炸作用下反直观动力行为的相似分析  

Similarity Research of Anomalous Dynamic Response of Ship Girder Subjected to Near Field Underwater Explosion

作　　者：张振华[1] 汪玉[2] 张立军[1] 袁建红[1] 赵海峰[1] 

机构地区：[1]海军工程大学船舶与动力学院船舶与海洋工程系,武汉430033 [2]海军装备研究院,北京100161

出　　处：《应用数学和力学》2011年第12期1391-1404,共14页Applied Mathematics and Mechanics

基　　金：国家安全重大基础研究973项目资助(51335020101)

摘　　要：针对漂浮船体梁结构在船舯底部近距爆炸作用下最终呈现的反直观中垂破坏现象进行了研究.首先以单发MK48鱼雷击沉DD973驱逐舰的实船打靶试验为例,建立了该问题的物理仿真模型,将水下爆炸冲击载荷的指数衰减段、倒数衰减段、倒数衰减后段和负压段压力精确加载到梁单元节点上进行求解,其中考虑了流固耦合效应、附连水质量以及重力和浮力变化的影响.之后利用相似理论对实船结构和箱型梁实验模型在中部下方近距爆炸作用下的整体动力响应进行分析,得到了决定船体梁中垂和中拱变形的相似参数及采用Rn数表示的理论预报公式,同时分析了各相似参数的物理意义和影响规律.The final anomalous sag distortion of ship girder subjected to near field underwater explosion（undex） below the middle ship was researched.Firstly,the sinking exercises of Spruance class destroyer DD973 sunk by one MK48 torpedo was presented and the simulation model was established.The exponential attenuation phase,reciprocal attenuation phase,post reciprocal attenuation phase and bubble pulse phase of undex load were precisely applied on this model.Fluid-solid interaction,added water mass,gravity and the change of buoyancy were also taken into account in this model.After that,the similarity theory was adopted to analyze the dynamic response of this ship girder.The similarity parameter and theory prediction formulae of the dynamic response of this ship girder were presented.Finally,the physical meaning and the influence of these similarity parameters were analyzed.

关 键 词：水下爆炸 船体梁 近场 反直观动力行为 相似分析 

分 类 号：U661.43[交通运输工程—船舶及航道工程]