Similarity research of anomalous dynamic response of ship girder subjected to near field underwater explosion  

作　　者：张振华 汪玉 张立军 袁建红 赵海峰 

机构地区：[1]Department of Ship and Ocean Engineering, Naval University of Engineering [2]Naval Academy of Armament

出　　处：《Applied Mathematics and Mechanics(English Edition)》2011年第12期1491-1504,共14页应用数学和力学（英文版）

基　　金：supported by the National Security Major Basic Research 973 Project of China(No.51335020101)

摘　　要：The final anomalous sag distortion of the ship girder subjected to the near field underwater explosion （undex） below the middle ship is studied. The sinking exercise of Spruance class destroyer DD973 sunk by one MK48 torpedo is first presented, and a simulation model is established. The exponential attenuation phase, the reciprocal attenuation phase, the post reciprocal attenuation phase, and the negative pressure phase of the undex load are precisely applied in this model. The fluid-solid interaction, the added water mass, the gravity, and the change of buoyancy are also taken into account. The similarity theory is then used to analyze the dynamic response of the ship girder. Similarity parameters and theory prediction formulae of the dynamic response of the ship girder are presented, The physical meaning and influences of these similarity parameters are analyzed.The final anomalous sag distortion of the ship girder subjected to the near field underwater explosion （undex） below the middle ship is studied. The sinking exercise of Spruance class destroyer DD973 sunk by one MK48 torpedo is first presented, and a simulation model is established. The exponential attenuation phase, the reciprocal attenuation phase, the post reciprocal attenuation phase, and the negative pressure phase of the undex load are precisely applied in this model. The fluid-solid interaction, the added water mass, the gravity, and the change of buoyancy are also taken into account. The similarity theory is then used to analyze the dynamic response of the ship girder. Similarity parameters and theory prediction formulae of the dynamic response of the ship girder are presented, The physical meaning and influences of these similarity parameters are analyzed.

关 键 词：underwater explosion （undex） ship girder near field anomalous response similarity analysis 

分 类 号：U661.4[交通运输工程—船舶及航道工程]