Analytical Models for the Response of the Double-Bottom Structure to Underwater Explosion Based on the Wave Motion Theory
Analytical Models for the Response of the Double-Bottom Structure to Underwater Explosion Based on the Wave Motion Theory
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DOI：
10.1155/2016/7368624
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发表时间：
2016-06
影响因子：
1.6
通讯作者：
Yingyu Chen;X. Yao;W. Xiao
中科院分区：
文献类型：
--
作者：
Yingyu Chen;X. Yao;W. Xiao
本文应用弹性波理论和经典的一维空化理论，对一典型双层底结构在水下爆炸作用下的响应进行了分析。引入变截面杆理论和广义声阻抗理论，得到了简化的分析模型。双层底结构是由三个子结构组成的基本单元来理想化的，这三个子结构包括简单的板、带加劲肋的板（T形）和与梁相关联的板（I形）。根据简化模型，建立了相应子结构的分析模型。通过考虑空化效应，可以更深入地理解流固耦合过程，以及应力波的传播。解析解与有限元预测结果吻合较好。另一方面，与主梁（I形）相关的面板的泰勒预测（包括空化效应）无效，表明分析方法的势场。验证的分析模型用于确定结构响应对无量纲几何参数、和的灵敏度。基于子结构的动力响应，建立了双层底结构水下爆炸响应的近似解析模型。
The aim of this paper is to apply the elastic wave motion theory and the classical one-dimensional cavitation theory to analyze the response of a typical double-bottom structure subjected to underwater blast. The section-varying bar theory and the general acoustic impedance are introduced to get the simplified analytical models. The double-bottom structure is idealized by the basic unit of three substructures which include the simple panel, the panel with stiffener (T-shaped), and the panel associated with girder (I-shaped). According to the simplified models, the analytical models for the corresponding substructures are set up. By taking the cavitation effect into account, the process of fluid-structure interaction can be thoroughly understood, as well as the stress wave propagation. Good agreement between the analytical solution and the finite element prediction is achieved. On the other hand, the Taylor predictions for the panel associated with girder (I-shaped) including the effects of cavitation are invalid, indicating a potential field for the analytical method. The validated analytical models are used to determine the sensitivity of structure response to dimensionless geometric parameters , , and . Based on the dynamic response of the substructures, we establish the approximate analytical models which are able to predict the response of double-bottom structure to underwater explosion.