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摘要 在现代化的战争中，海战是不可避免的，水面舰艇作为海上作战的一个重要基地，舰船的生命力代表了它的战斗能力。因此，对舰船进行水下爆炸数值模拟研究是必不可少的。 本文采用理论分析和数值模拟的方法研究水下爆炸冲击波载荷的传播和气泡在自由场和边界附近的动态特性。 首先应用了 AUTODYN 程序建立了一维计算有限元模型，对 1.47kg 球型 TNT装药水下爆炸的冲击波的传播过程和气泡的脉动进行了数值模拟。发现气泡的脉动现象与理论比较符合，冲击波处于峰值的压力的数值模拟结果与经验公式比较符合。然后讨论探讨了不同网格的划分、设置不同边界条件对冲击波处于峰值压力的影响。发现了不同的网格划分对数值模拟准确度的影响，也发现了设置不同的边界条件的反射影响。 其次应用 AUTODYN 有限元程序建立二维轴对称计算模型，通过设置不同的工况，相同爆距不同装药量以及相同装药量不同爆距，研究了加筋板架的动态响应，得到了加筋板的最大位移以及测量点的速度曲线，从而得到了在冲击波作用下的加筋板架的动态响应。 最后，建立了在自由场，近自由水面和刚性边界下水下爆炸的有限元模型，通过调整距离参数，对气泡进行数值模拟，通过试验现象和数值计算的结果相比较，从而得到了AUTODYN 在水下爆炸数值模拟中有着较好的精确度。 58996
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毕业论文关键词：水下爆炸，冲击波，加筋板，气泡脉动 ABSTRACT In the modern war, naval battle is inevitable, surface ships as an important base of sea warfare, the vitality of the ship represents its combat capability. Therefore, it is necessary to study the numerical simulation of underwater explosion. In this paper, theoretical analysis and numerical simulation are used to study the propagation of underwater explosion shock wave load and the dynamic characteristics of bubbles in the vicinity of free field and boundary. Firstly, the AUTODYN program was used to establish a one-dimensional finite element model, and numerical simulation was carried out on the propagation of shock wave and the pulsation of bubbles in 1.47kg ball shaped TNT. It is found that the pulsation phenomenon of bubbles is consistent with the theory. The numerical simulation results of the shock wave at the peak value are in line with the empirical formula. Then, the influence of different grid pision and different boundary conditions on the peak pressure of the shock wave is discussed. The influence of different mesh pision on the accuracy of numerical simulation was found, and the reflection effect of different boundary conditions was also found. Followed by the application of AUTODYN finite element program a 2D axisymmetric calculation model, by the different working conditions setted, the same burst from the different charge and same charge different explosion distance of dynamic response of stiffened plate frame, the stiffened plate frame of the maximum displacement and measuring point velocity curve, so as to obtain the dynamic response of stiffened plate under the action of shock wave frame. Finally, the establishment of the free field, near the free surface and rigid boundary water finite element model of the explosion， By adjusting the distance parameter. Through test and numerical calculation results are compared, so as to get the AUTODYN in underwater explosion has a good accuracy in the numerical simulation.
Key words： Underwater explosion, shock wave, stiffened plate, bubble pulsation
目 录
第 1 章 绪论 . 1
1.1立题背景及研究意义 1
1.2水下爆炸研究领域发展的历史和现状 .. 1
1.2.1水下爆炸理论分析的发展现状 . 2
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