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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >Dynamic Response of Ship Model with Shock Protective Layer Subjected to Underwater Explosion
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Dynamic Response of Ship Model with Shock Protective Layer Subjected to Underwater Explosion

机译：水下爆炸作用下具有冲击防护层的舰船模型动力响应

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摘要

Contact and no-contact explosion are main causes of hull's wrecked and device abnormal work for warship. It decrease warship's survivability. In order to improve the survivability of warship to underwater explosion, a new rubber shock absorption and isolation structure is proposed in this work. The structure uses the principle of energy absorption with structure deformation and shock wave reflection between the interfaces of materials with great impedance mismatch. The shock protective layer can be stuck to the outer hull of the ship. Both of experimental and numerical methods are used to study the shock protection ability and dynamic response of ship model with the protective layer. Experimental model is a 2 m X 1 m X 0.7 m steel box with stiffeners simulating ship structure. The weight of box and ballast is 800 kg and the waterline 0.4 m high. Experiments were carried out in a semi-spherical water pond with 85 m diameter and 15 m deep. The spherical explosion charge is 1 kg TNT and located 5 m below the center of ship model's bottom plate. The ship models with and without shock protective layer were experimented. Every model was tested three times with the same charge and standoff distance. Each series of experiments with shock protective layer have the same result. It is shown that the shock protective layer can be applied repeatedly. The ship model under the same experimental condition was numerically analyzed using the software ABAQUS explicit dynamic package. Theoretical charge parameter was determined by experimental results. The influence of outer protective layer on stress of inner steel layer is studied too. Rubber is regarded as linear elastic material and the pressure in water is obtained analytically. The strain, acceleration and velocity histories of ship model obtained from experiments and numerical analysis were compared. The experimental and numerical results correlate well with each other. So this numerical analysis method is used to optimize the design of shock protective layer in later research. This work compares the numerical and experimental results of ship model with and without shock protective layer. The results show high shock isolation efficiency of the novel shock protective layer structure.
机译：接触爆炸和非接触爆炸是造成军舰船体残骸和设备异常工作的主要原因。它降低了军舰的生存能力。为了提高军舰在水下爆炸中的生存能力，提出了一种新型的橡胶减震隔离结构。该结构采用能量吸收原理，具有较大的阻抗失配，在材料界面之间发生结构变形和冲击波反射。防震层可以粘在船的外船体上。通过实验和数值方法来研究带有保护层的舰船模型的冲击防护能力和动力响应。实验模型是一个2 m X 1 m X 0.7 m的钢箱，带有模拟船体结构的加劲肋。盒子和压载物的重量为800千克，水线高0.4 m。在直径为85 m，深度为15 m的半球形水池中进行实验。球形爆炸装药为1千克TNT，位于船模底板中心下方5 m处。实验了带有和不带有防震层的舰船模型。每个模型均以相同的充电和隔离距离测试了3次。每个带有防震层的实验都具有相同的结果。示出了防震层可以重复施加。使用ABAQUS显式动态软件包对相同实验条件下的船舶模型进行了数值分析。理论电荷参数由实验结果确定。还研究了外保护层对内钢层应力的影响。橡胶被视为线性弹性材料，并且可以通过分析获得水中的压力。比较了通过实验和数值分析得出的舰船模型的应变，加速度和速度历史。实验结果和数值结果相互关联良好。因此，在以后的研究中，将这种数值分析方法用于优化防震层的设计。这项工作比较了带有和不带有防震层的船舶模型的数值和实验结果。结果表明，新型减震层结构具有较高的隔震效率。

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