Similarity research of anomalous dynamic response of ship girder subjected to near field underwater explosion |
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Authors: | Zhen-hua Zhang Yu Wang Li-jun Zhang Jian-hong Yuan Hai-feng Zhao |
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Institution: | Zhen-hua ZHANG 1,Yu WANG 2,Li-jun ZHANG 1,Jian-hong YUAN 1,Hai-feng ZHAO 1 (1. Department of Ship and Ocean Engineering,Naval University of Engineering,Wuhan 430033,P. R. China,2. Naval Academy of Armament,Beijing 100161,P. R. China) |
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Abstract: | 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. |
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Keywords: | underwater explosion (undex) ship girder near field anomalous response similarity analysis |
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